Method for adjusting display range of image obtained by document camera

The adjustment method of the image display range applied to the presentation camera

This case is a method for adjusting the display range of an image, especially when it is used in the presentation of the camera for real-time projection of the image and the image of the data file, the display range of the adjustment method.

In general business or seminars of the company or school, it is often necessary to use some written documents or picture forms for discussion and presentation. At this time, we often use a so-called presentation camera. (document camera) This device is used to assist us in the process of meeting or other presentation operations. This type of presentation camera is also called a textbook reminder. However, the most common general term is the physical projector.

Since the structure of the general physical projector is a combination of the image photography, scanning and image output functions of a camera or scanner, for example, digital camcorders, digital cameras, and cameras are used in the photography part. Functional mobile phones, surveillance cameras, or general PC cameras and other camera modules used, and based on the current technology, according to the production process, price, pixel sensitivity, The power consumption and other conditions are different, which can be mainly divided into complementary metal-oxide semiconductor (Complementary Metal-Oxide Semiconductor, hereinafter referred to as CMOS) image sensing devices, and Charged Coupled Device (hereinafter referred to as hereinafter referred to as It is the image sensor device of CCD). Its role is like the negative film in a traditional camera. It uses chemical reaction to sense the changes produced by light and develop it, while the image sensor device of CMOS and CCD can be used. Using the effect of photoelectric conversion, according to the different intensities of the sensed light, a corresponding number of charges are relatively generated, and thus a current can be formed and output.

However, according to different requirements, CMOS and CCD image sensing devices also have different application fields. Generally speaking, the production technology of CCD image sensor devices is relatively mature, and its pixel value or resolution is relatively high. Therefore, it is most often used in digital cameras or digital camcorders with medium and high resolutions. The power is large, the price is high, and most of the technology in the manufacturing process is still controlled by Japanese manufacturers. On the contrary, although the CMOS image sensor device is not as effective as CCD in terms of pixel value, its production uses standard semiconductors. The manufacturing process can be mass-produced, and the features of low power consumption and low price are applied to camera phones, PC cameras, etc. that do not require too much resolution, and also have a considerable market. Therefore, the production of general physical projectors will also use CMOS or CCD image sensing devices as the main structure of the camera module according to the use requirements.

Therefore, ordinary physical projectors can not only take pictures of a three-dimensional physical image, but also can be applied to flat image devices such as image scanners and fax machines. After the image is scanned, it can be projected on the matching projection screen using a general three-shot projector or a single-shot projector, or it can also be output to the monitor of a general TV or computer system, and the same It can also display the objects that users want to display in real time (live video).

Therefore, such an operation process can eliminate the need for users to prepare the presentations, reference documents, and drawings for the presentation in advance, and then use the image scanner to prepare for scanning before they can reuse the computer systems monitor or The projection screen is time-consuming and inconvenient, and there is no need to use transparent projection films to make presentations in color or black-and-white photocopying of these files and pictures in advance; therefore, the physical projectors produced in this technical field can not only reduce user preparations In addition to the burden of the report, the speaker is also given greater convenience and flexibility during the briefing process.

Please refer to the first figure (a), which is a schematic diagram of the operation of a conventional physical projector 10 for image display of an object 1 to be displayed. As shown in the figure, the conventional physical projector 10 uses a single-shot projector 20 to project the image of the object to be displayed 1 obtained through the process of photography and scanning onto a projection screen 21 for playback, so , The user only needs to place the object 1 to be displayed on a photographing module 11 of the conventional physical projector 10 (the main structure can be an image sensing device with CCD or CMOS) Previously, the image of the object 1 to be displayed can be instantly seen on the projection screen 21; and under the general conventional technology, the photographing module 11 also has the function of adjusting the focal length, therefore, the image of the object 1 to be displayed can be The object 1 zooms in or zooms out the image of a certain area, so that the observer can see the content or appearance of the display more clearly.

Please refer to the first figure (b), which is a block diagram of the system operated by the conventional physical projector 10. As shown in the figure, the conventional physical projector 10 also includes a digital signal processor (DSP) 12, an image synthesizer 13, a memory 14, and a digital/analog signal converter 15. , And the photographing module 11 also includes an analog/digital signal converter 111, so that the photographing module 11 can convert the image signal of the original analog format to the image of the object to be displayed 1 photographed and scanned by the The analog/digital signal converter 111 converts the image signal into a digital format, and then outputs it to the digital signal processor 12 for processing, such as signal processing after image enlargement or reduction, and can be further output to the image synthesizer 13 The process of image synthesis, such as: superimposition of different image frames; in addition, the memory 14 can be used for the image of the object to be displayed 1 photographed and scanned by the photographing module 11 through the digital signal processor 12 After processing, record and save the data in the format of picture or image file.

Therefore, in addition to real-time display of the image of the object to be displayed 1, we can also use the image synthesizer 13 to further store the image in the memory 14 and the image transferred by the object that has been photographed and scanned. The data file is combined with the real-time displayed image for two images, and the comparison and display between the two can be performed at the same time; and the digital/analog signal converter 15 can also be used for the digital signal processed by the image synthesizer 13 , And then converted into an analog signal, so that the single-shot projector 20 can project the synthesized image frame onto the matching projection screen 21 for output display.

However, according to the current conventional technology, most of the comparison and display between the real-time displayed image and the image of the data file in the memory 14 use electronic panning. The way of processing, that is, the common presentation of the picture is divided into two halves to deal with. Please refer to the first figures (c) and (d), which are two image frames displayed by the conventional physical projector 10 on the projection screen 21 in a co-presentation manner. As shown in the first figure (c), the co-presented screen is an object image screen P1 presented by the object to be displayed 1 and a file presented by a record file stored in the memory 14 The image frame P2 is composed; suppose the display size of the object image frame P1, the file image frame P2, and the projection screen 21 is 800×600 pixels, and its starting coordinate is (1,1), so in the projection The left half of the screen 21 presents the left half of the object image frame P1, that is, the display range is from (1,1) to (400,600) on the original object image frame P1, and the right part of the projection screen 21 The half part shows the right half of the file image frame P2, that is, the display range is from (401,1) to (800,600) of the original file image frame P2.

As shown in the first figure (c), the object image frame P1 and the file image frame P2 are displayed on the projection screen 21, and only half of the original size is displayed. If the object image frame P1 is to be displayed The right half, or the left half of the file image screen P2 for our comparison, under the conventional technology, as shown in the first picture (d), we can only use the electronic translation method similar to the scrolling window. The control interface of the conventional physical projector 10, such as a remote control, shifts its presentation range to the desired display part, so that the right half of the object image screen P1 is displayed on the projection screen 21 from ( 401,1) to (800,600), and the left half of the file image P2 from (1,1) to (400,600); however, this electronic translation method still cannot change the position of the two images on the projection screen 21 The size of the respective display range (that is, the maximum is only half of the projection screen 21), and therefore cannot present a larger display range. Therefore, during the presentation process, the user cannot more conveniently perform the image between the two The comparison. Therefore, how to solve this problem of conventional technology has become the main purpose of the development of this case.

This case is an image display range adjustment method, which is applied between a presentation camera and an image display device. The presentation camera includes an image synthesis controller and an image buffer memory, and the method includes the following steps: The image synthesis controller receives a first image frame and a second image frame; in response to an image side-by-side display information, the image buffer memory is divided into a first area and a second area, and the image synthesis controller can Partial data of the first image frame and the second image frame are respectively filled in the first area and the second area; the image buffer memory is made in response to the user's change in the side-by-side display information of the image Divided into a third area and a fourth area, and the image synthesis controller can fill in the third area and the fourth area with partial data of the first image frame and the second image frame respectively; and The data filled in the image buffer memory is output as a composite screen to the image display device for display.

According to the above-mentioned conception, the method for adjusting the image display range described in the present application can generate the first image frame by sensing the image of an object to be displayed by the presentation camera.

According to the above-mentioned conception, in the method for adjusting the image display range described in the present application, the presentation camera further includes a memory, and the memory system signal is connected to the image synthesis controller, so that the image synthesis controller can store and record in An image data file in the memory is read to become the second image frame.

According to the above conception, in the method for adjusting the image display range described in this case, the image data file can refer to the file that the presentation camera uses to store and record the image of the object that has been photographed or scanned in the memory .

According to the above-mentioned conception, in the method for adjusting the display range of the image in this case, the size of the image buffer memory can be composed of p pixels in length and q pixels in width, and the image displays information side by side It can mean that the user activates the image parallel function of the presentation camera, and according to the initial setting of the function, the length of the image buffer memory is located at the position beside the p/2th pixel to define a dividing line. The image buffer memory is divided into the first area and the second area having the same size.

According to the above conception, in the method for adjusting the image display range described in this application, the partial data of the first image frame and the second image frame can refer to the image synthesis controller capturing the first image frame and the second image frame. The length of the two image frames is p/2 pixels, and the width is the range of q pixels, which are respectively filled in the first area and the second area, and the first image frame and the second image frame For the undisplayed data in the middle part, the image synthesis controller can use electronic translation to fill them in the first area and the second area for display.

According to the above conception, in the method for adjusting the image display range described in this case, the change of the side-by-side display information of the image can be part of the data that the user wants to display the first image frame and the second image frame. Adjust the display range so that the image synthesis controller moves forward to the p/2-nth pixel at the position beside the p/2th pixel where the dividing line in the image buffer memory is located The position next to the point, or move back to the position next to the p/2+nth pixel, so the image buffer memory can be divided into the third area and the fourth area with different sizes, where n is less than or An integer equal to p/2.

According to the above conception, the adjustment method of the image display range described in this case, wherein when the dividing line changes forward or backward, when part of the data of the first image frame is covered, the covered range is The corresponding part of the second image frame is displayed, and when the part of the second image frame is covered, the covered area shows the corresponding part of the first image frame Part of the information.

According to the above-mentioned conception, the method for adjusting the image display range of the present application, wherein in the third area and the fourth area, part of the undisplayed data of the first image frame and the second image frame can be used The image synthesis controller uses electronic translation to fill in the third area and the fourth area for display.

According to the above conception, in the method for adjusting the image display range of the present application, the first area and the second area, or the third area and the fourth area can be filled with image frame data from different image signal sources. The first area plus the second area or the third area plus the fourth area can be the entire range of the image frame that the image buffer memory can display.

According to the above-mentioned conception, in the method for adjusting the image display range described in this application, the function of the image synthesis controller is to superimpose and synthesize the displayed ranges of the first image frame and the second image frame, respectively. And based on the data filled in the image buffer memory, it is displayed on the image display device as the composite screen.

According to the above-mentioned conception, in the method for adjusting the image display range described in the present application, the image display device applied can be a display, or can be composed of a single-shot projector or a three-shot projector with a projection screen.

Please refer to the second figure, which is a system block diagram of a physical projector 100 in the preferred embodiment of the present invention. In this preferred embodiment, we use the physical projector 100 to represent the presentation camera in the present invention. At the same time, as shown in the second figure, it can be seen that the physical projector 100 is applied to an object to be displayed 2 , And an image display device, such as a display, or it can be composed of a single-shot or three-shot projector and a projection screen. In this preferred embodiment, we use a single-shot projector 40 And the composition of a projection screen 41 matched with it represents the image display device in the present invention. In addition, the object to be displayed 2 used in this preferred embodiment can be a document-sized flat paper, a picture, a lecture, etc., or a general three-dimensional model object for presentation.

As shown in the second figure, in this preferred embodiment, the physical projector 100 mainly includes a camera module 31, a digital signal processor 32, an image synthesis controller 33, and a memory. 34. The camera module 31 can sense the image generated by the object 2 to be displayed, and then generate a real-time image signal for output, and the camera module 31 can be as described in the prior art With CCD or CMOS image sensing device, it can produce photoelectric conversion effect, and then can be used for signal output; at the same time, the camera module 31 also includes an analog/digital signal converter 311, which can convert the original The real-time image signal in the analog signal format is converted into a digital signal format and then output to the digital signal processor 32 for processing. Therefore, an object image frame representing the image of the object 2 to be displayed can be generated, and It is received by the image synthesis controller 33, and in this preferred embodiment, we use the object image frame to represent the first image frame in the present invention.

In addition, as shown in the second figure, the memory 34 is signally connected to the digital signal processor 32 and the image synthesis controller 33. Therefore, the function of the memory 34 can be used for the photographing module 31 The image of the object that has been photographed or scanned is processed by the digital signal processor 32 and then recorded and stored in the format of a picture or image file. Therefore, in this preferred embodiment, the image is synthesized The controller 33 can read an image data file stored and recorded in the memory 34 to become a file image frame. In this preferred embodiment, we use the file image frame to represent the case The second image in the invention.

As shown in the second figure, it can be seen that the image synthesis controller 33 also includes a frame buffer 331. In this preferred embodiment, the function of the image synthesis controller 33 , It is possible to fill the image buffer memory with the image data to be displayed after performing the process of image superimposing and synthesizing the displayed range of the received object image screen and the file image screen, respectively In 331, at the same time, through a digital/analog signal converter 35, the data is converted into an analog format signal that can be read by the single-shot projector 40, and then output as a composite image to the projection screen 41 To display. Therefore, what data the image synthesis controller 33 fills in the image buffer memory 331 is the image frame that the single-shot projector 40 will output and display on the projection screen 41.

Please refer to the third figure (a), which is a block diagram of the image buffer memory 331. From the foregoing, it can be seen that the physical projector 100 outputs to the projection screen 41 for display based on the data filled in the image buffer memory 331, so the image buffer memory is changed The data filled in 331 can change the image frame to be output and displayed on the projection screen 41. In this preferred embodiment, the size of the image buffer memory 331 can be 800×600 pixels (that is, the length of 800 represents the p pixels in the present invention, and the width of the 600 represents the q pixels in the present invention). Therefore, as shown in the figure, the displayable range of the image buffer memory 331 can be from (1,1) to (800,600) of the starting coordinates . Since the display of the screen can be subdivided into a combination of many horizontal scan lines, and each scan line is composed of many pixels, so, in the image buffer memory The volume 331 is recording the data that each pixel represents and a certain part of the screen is about to be presented.

Please refer to the third figures (b) to (e), which are schematic diagrams of the image composition controller 33 performing image composition on the object image frame S1 and the file image frame S2 in the image buffer memory 331. Therefore, in this preferred embodiment, firstly, the image synthesis controller 33 receives the object image frame S1 and the file image frame S2, and displays information in parallel according to an image, so that the image synthesis controller 33 can display the image The image buffer memory 331 is divided into a first area A1 and a second area A2 as shown in the third figure (b), and the image synthesis controller 33 can respectively separate the object image frame S1 and the file image frame S2 Part of the data (such as the image within the range enclosed by the dotted line) is filled in the first area A1 and the second area A2.

The above-mentioned image side-by-side display information refers to the user's activation of the image side-by-side function of the physical projector 100 (that is, the function of comparing two image frames with each other and displaying simultaneously as mentioned in the prior art), and According to the initial setting of the function in the prior art, the length of the image buffer memory 331 is between the 400th and 401th pixels, which is the position beside the p/2th pixel in the present invention. A dividing line L is defined. As shown in the third figure (b), the position of the dividing line L can divide the image buffer memory 331 into the first area A1 and the second area A2 having the same size .

The inventive feature of this case is that following the above, it can respond to the user's changes in the side-by-side display information of the image (for example: the user can operate a remote control matched with the single-gun projector 40, and use the left and right sides of the remote control. Adjust the function of the button to adjust the image frame that the user wants to display), so that the image buffer memory 331 can re-divide the first area A1 and the second area A2 that originally have the same size into different sizes A third area A3 and a fourth area A4, whether it is the first area A1 and the second area A2, or the third area A3 and the fourth area A4, in this preferred embodiment of the present invention , Can fill in the image frame data of different image signal sources, and at the same time, the first area A1 plus the second area A2, or the third area A3 plus the fourth area A4, it is better implemented here In the example, that is, the entire range of the image frame that the image buffer memory 331 can display, and at the same time, the data filled in is also the content to be displayed on the composite screen. As shown in the third figure (c), the image synthesis controller 33 can respectively fill in partial data of the object image frame S1 and the file image frame S2 (such as the image within the range enclosed by the dotted line). Into the third area A3 and the fourth area A4, the data filled in the image buffer memory 331 can be finally output on the projection screen 41 as the composite image.

The above-mentioned change of the side-by-side display information of the image can be that the user himself wants to further perform the display range of the partial data of the object image screen S1 and the file image screen S2 that are already being displayed side-by-side. Adjustment; In this preferred embodiment, as shown in the third figure (c), we can thus enable the image synthesis controller 33 to change the separation line L in the image buffer memory 331 from the original It is located between the 400th and 401th pixels, which is the position beside the p/2th pixel in the invention of this case, and moves back to between the 500th and 501th pixels, which is the invention of this case The position next to the p/2+nth pixel in, and n is defined as 100, or as shown in the third figure (d), the dividing line L can also be moved forward to the 300th and 301th pixels Between the dots, that is, the position beside the p/2-nth pixel in the present invention, n is also defined as 100 here, so the image buffer memory 331 can be further divided into different sizes The third area A3 and the fourth area A4, where n is an integer less than or equal to p/2, so when n is equal to p/2, the entire image buffer memory 331 can be displayed as a single screen of the object The image frame S1, or the file image frame S2. Therefore, by changing the content of the data filled in the image buffer memory 331 in this way, we can change the side-by-side image screen to be displayed.

As mentioned above, when we display the object image frame S1 and the file image frame S2 side by side, this part is still the same as the prior art, that is, the image buffer memory 331 is divided into two parts of the same size. Block area to fill in part of the object image frame S1 and the file image frame S2. Therefore, in this preferred embodiment, the image synthesis controller 33 can be used to capture the object image frame S1 And the file image frame S2 whose length is 400 pixels and the width is 600 pixels (such as the image in the range contained in the dotted line shown in the third image (b)), to be filled in respectively In the first area A1 and the second area A2, and part of the undisplayed data in the object image frame S1 and the file image frame S2, the image synthesis controller 33 can be used to use the previously mentioned data In the electronic panning method, without changing the first area A1 and the second area A2, fill in the data to be displayed in the first area A1 and the second area A2, respectively. show.

Continuing from the above, when we want to change the range of the object image frame S1 and the file image frame S2 to be displayed separately, the dividing line L in the present invention can be moved and adjusted. That is, the data filled in the image buffer memory 331 is changed and adjusted, so that the object image frame S1 and the file image frame S2 can generate display ranges of different sizes, thus being within the range of the change of the dividing line L , So that the data of the changed image frame corresponding to the two parts can be swapped between the two parts that can be displayed or not displayed; therefore, in this preferred embodiment, the dividing line L When changing forward or backward, such as the process of changing from the third image (b) to the third image (c) or the third image (d), the part of the image frame S1 of the object that will be hidden is the data At this time, the covered area will display the corresponding part of the file image frame S2. Similarly, when the part of the file image frame S2 to be covered is the part of the file image frame S2, it will be covered. The range displays the corresponding part of the image frame S1 of the object.

Based on the above, we can change the deficiency described in the previous technology, that is, when comparing the two images, we cannot change the problem that each of them can only present at most half the size of the projection screen. However, From the above, we can change the respective display ranges of the two image frames to get a clearer comparison; in addition, in this preferred embodiment, as shown in the third figure (b), (c) or As shown in (d), in the first area A1 and the second area A2, or the third area A3 and the fourth area A4, part of the object image frame S1 and the file image frame S2 is not The displayed data can also enable the image synthesis controller 33 to re-use the electronic translation method described in the prior art to fill in the undisplayed data into the third area A3 and the fourth area A4, respectively. Therefore, it can be achieved as shown in the third figure (e). In addition to adjusting the size of the display range according to the needs of the user, the screen can also be shifted according to the needs of the user to compare To the range that the user wants to display. Therefore, according to the inventive concept of this case and the description of this preferred embodiment, we can change the size of the display range between the two image frames, and the position to be displayed, so that there can be a clearer and better display between the two image frames. Convenient comparison and co-presentation method can successfully achieve the purpose of the invention of the case.

Please refer to Figure 4, which is a flowchart of a preferred embodiment of the present invention. First, the image synthesis controller 33 receives the object image frame S1 and the file image frame S2; then, according to the image side-by-side display information, the image synthesis controller 33 can divide the image buffer memory 331 into a first area A1 and a first area A1 having the same size. The second area A2, and the image synthesis controller 33 can fill in the first area A1 and the second area A2 with partial data of the object image frame S1 and the file image frame S2 respectively, and display the images in parallel according to the users The change of information enables the image synthesis controller 33 to divide the image buffer memory 331 into a third area A3 and a fourth area A4 with different sizes, and the image synthesis controller 33 can separately divide the object image frame S1 and the file image frame Part of the data of S2 is filled in the third area A3 and the fourth area A4; finally, the data filled in the image buffer memory 331 will be output as a composite screen to the single-shot projector 40 and its matching projection Display on the screen 41.

Therefore, in summary, we provide a way for users to adjust the display range of the screen with more changes when operating this kind of physical projector or presentation camera. When comparing the two image frames, each of them can only show the problem of missing half the size of the projection screen. Therefore, from the above, we can see that we have successfully achieved the main purpose of developing this case, but the invention of this case can be modified in various ways by those who are familiar with this technique, but they are not deviated from the scope of the patent application. protector.

<heading level="1">The components included in the scheme of this case are listed as follows:</heading><p>Learn to use physical projectors. . . 10</p><p>Physical projector. . . 100</p><p>Objects to be displayed. . . 1, 2</p><p>Photography module. . . 11, 31</p><p>Analog/digital signal converter. . . 111, 311</p><p>Digital signal processor. . . 12, 32</p><p>Image synthesizer. . . 13</p><p>Image synthesis controller. . . 33</p><p>Image buffer memory. . . 331</p><p>Memory. . . 14, 34</p><p>Digital/analog signal converter. . . 15, 35</p><p>Single gun projector. . . 20, 40</p><p>Projection screen. . . 21, 41</p><p>Object image screen. . . P1, S1</p><p>File image screen. . . P2, S2</p><p>The first area. . . A1</p><p>The second area. . . A2</p><p>The third area. . . A3</p><p>The fourth area. . . A4</p><p>Dividing line. . . L</p>

In this case, the following diagrams and descriptions can be used to gain a deeper understanding: The first picture (a) is a schematic diagram of the operation of conventional physical projectors for image display of objects to be displayed.

The first figure (b) is a block diagram of the system operated by conventional physical projectors.

The first picture (c) and (d) are two kinds of images displayed by the conventional physical projector on the projection screen in a co-presentation way.

The second figure is a system block diagram of the physical projector 100 in the preferred embodiment of the present invention.

The third figure (a) is a block diagram of the image buffer memory 331. The third figure (b) to (e) is a schematic diagram of the image synthesis controller 33 synthesizing the object image frame S1 and the file image frame S2 in the image buffer memory 331.

The fourth figure is a flow chart of the preferred embodiment of this case.