Document processing device with correction circuit and video display.

The invention relates to a device for document processing according to the preamble of claim 1.

For predictive text entry, document processing or the like, character reading devices for optical scanning of character styles are known, which read information is forwarded in encoded form to a data processing system or displayed on a visual display unit. in this case be from the detection electronics unrecognizable characters by rejection characters, eg in the form of a rectangle, particularly marked. By means of an input keyboard then it is possible to key the corresponding character on the signaled through a so-called cursor character position.

However, cases are also conceivable in which the unrecognized characters even in existing redundancy out of context (context) can not be clearly identified. Already these cases D_atensicht- known devices which operate in a separate area of ​​the screen is a pseudo graphical representation of the bit pattern for the unrecognized characters is possible. With regard to a high resolution such bit patterns are usually represented in a very large scale, so that the viewer's eye with a simultaneous consideration of Alphanumerikzeichen the top of the screen on the one hand and the graphic bit pattern at the bottom of the picture screen, because of the differences in size, must constantly change, so that the eye tired relatively quickly.

Therefore, the present invention is based on the object of disclosing a document processing device with optical character recognition a way with which the correction of erroneous or incomplete read document data as quickly as possible and under ergonomic aspects is as simple and fatigue feasible.

This object is achieved in a generic device by the characterizing features of claim 1.

Advantageous developments of the invention result from the features of the dependent claims.

The advantages achieved with the invention consist in the fact that both groups of characters are not recognized characters containing as well as the bit pattern of the unrecognized character, immediately above or below the corresponding rejection characters are displayed in a separate correction field of the screen, so that a rapid mapping of the unrecognized characters to the next each candidate character class and consequently a quick correction is possible. In addition, due to the smaller dimensions of the bit patterns are no adaptation difficulty operating.

An embodiment of the invention is illustrated in the drawing and will be described in more detail below. They show:<ul><li>1 shows the block diagram of a correction circuit in a document processing device according to the invention</li><li>2 shows an example of a completed handprinted document</li><li>3 shows an example of the storage of the bit patterns in the individual memory of the correction circuit shown in FIG 1</li><li>Figure 4 shows the representation of the document information as shown in FIG 2 on the screen of a data display unit.</li></ul>

The basic circuit shown in FIG 1 is part of a device for document processing, in which provided at an input station records a reading station LE supplied read there optically and are then transported to a dispensing station. At the same time read in a scanning ABT data is further processed into a character classifier ZK and transmitted in encoded form to a display controller AZS for the visual display unit DGS. In addition, the cached in an image data storage BDS read data, including the original content of a completed handprinted document according to FIG 2, a black and white information via an interface SS1 and a bit-pattern-Anpaßwerk BAN are serially transmitted in a first Bitmusterspeicher BMS1 the correction unit KE, which all characters the document caches as a bit pattern. The output of this first Bitmusterspeichers BMS1 is connected to a second, smaller Bitmusterspeicher BMS2. Due to the first data transmitted to the display controller AZS datzes D1 containing the classified characters, including rejection characters in coded representation that it only in each case the bit pattern of the unrecognized characters in the second Bitmusterspeicher BMS2 the first Bitmusterspeicher BMS1 will be driven so transfers.

For this purpose calculated a provided in the display controller AZS microcomputer based on the position of the reject character in the data DI^- for each rejection the A_nstart address of the memory area in the first Bitmusterspeicher BMS1 that contains the bit pattern of each unrecognized character. These initial addresses are provided via the interfaces SS2, SS3 the memory controller BSC is available that carries out the re-storing the information indicated by the respective start addresses of storage areas from the first to the second Bitmusterspeicher BMS1 Bitmusterspeicher BMS2. The storage capacity of the first Bitmusterspeichers BMS1 is so dimensioned that the bit pattern of all characters of a document can be stored, while that of the second Bitmusterspeichers BMS2 is designed so that there the bit patterns of the reject characters can be stored for several documents. This results in a buffer effect between the reading and the correction process. Increasing the throughput capacity of the document processing device is the result.

Next, a second data D2 is built into the display controller AZS containing only strings, which fit at least a reject character. This second data D2 can be up to as many character positions, as shown in a screen - line can be displayed. In many reject characters in a document several correction phases have to be completed, where appropriate, for the correction of this document, with a new second data set has to be built for each phase.

Due to the respective position of the reject character within the second dataset D2 new start addresses now be calculated with which the bit patterns are transmitted from the second Bitmusterspeicher BMS2 into a downstream frame buffer BWS. The frame buffer BWS is organized so that its binary content can be displayed as a graphic in a horizontal stripe on the screen of the visual display unit DSG. The vertical extension of the strip is dimensioned so that the height of the bit pattern can be imaged. This strip thus formed is shown above or optionally below the data line of the second data set D2 on the screen.

Unlike the Bitmusterspeichern BMS1 and BMS2 the frame buffer BWS is not described but packed such that the bit pattern companies directly when playing the memory contents or come to stand on the screen above the corresponding rejection mark of the second record. To this end, each character line is assigned an initial address in the frame buffer in the BWS data D2.

Details of data transfer between the first and second Bitmusterspeicher BMS1, 2 and between the second Bitmusterspeicher BMS2 and the frame buffer BWS are shown in FIG. 3 The each marked with a dark triangle in the upper left corner of the memory blocks SB2, SBk, SBn, SBx, SBY contain the bit pattern not recognizable characters. They are initially transferred in mating plug shape in the second Bitmusterspeicher BMS2 and finally enrolled according to the position of the reject character in the second data D2 in the frame buffer BWS.

The graphic pattern contained in the frame buffer BWS are finally displayed by the memory controller BWC in the screen of the visual display unit DSG at a defined location. This is done in such a way that the transmission of the encoded characters from the display controller AZS via the control unit CRTC and the parallel / serial converter PSW of the data display unit DSG stopped at a defined point and instead the content of the frame buffer is read BWS. the characters of the first data set D1, for example, the total information of the document shown in FIG 2, the second data D2 with the respective one or more reject character strings containing and the second data set spatially associated content of the frame buffer are then shared on the screen of the visual display unit shown ,

Details of the display on the screen are shown in Fig. 4 In a first screen area BOD1 the information of the document shown in FIG 2 is shown as a result of the character generator ZK in Scripture given by the character code. Unrecognized characters are characterized by rejection characters, for example, by a rectangle particularly. In the second screen area BOD-2 are those strings, that represented particular whole words or contiguous sequences of numbers that do not contain recognizable characters, a second time. In addition, the associated bit pattern is directly above or optionally with the respective unrecognized character from the frame buffer BSW (see FIG 1) appears. From the context (context) of the string and the graphic pattern of the unrecognized character can then be quickly determined the candidate characters and inscribed subsequently via a keyboard.

If there are several unrecognizable and closely genachbarte characters in a string, this string is, as the example shows Konstanz represented accordingly multiply and associated with each of these strings per a graphic pattern for an unrecognized character. It is expedient if a plurality, preferably all the strings in a document with unrecognizable characters are displayed together on the screen, because disturbing image Change during the correction of a single document can be largely avoided.

The instantaneously influencing rejection location is marked on the screen with a so-called cursor. This cursor is as represented by a rectangular light frame whose interior periodically light / dark switching flashes. Once the determined character is keyed, the cursor jumps to the next point rejection. After the correction of the last rejection point of the cursor from the document frame and the corrected data disappears is transmitted to the data processing system.

In the area marked by a rejection mark mark, although the detection electronics has detected usually the sign, but not unequivocally enough so that the detection security check fails. In the device controlling the visual display unit, a comparator is now provided, which compares the respective the ambiguous recognizable character binary character code to the character code of the keyed character and an inequality, an audible and / or visual warning signal is triggered.