JPS5994967A - Picture data compressing device - Google Patents

Abstract

PURPOSE:To save waste of processing time and to eliminate missing of information by discriminating an error of a compressing device and selecting and outputting a picture data or a compressed data based on the result of discrimination. CONSTITUTION:When a compression error occurs in the compressing device 3, an error signal (j) is outputted from the device 3 to a controller 9 and the device 3 stops the processing. When the compressed data for one line's share is finished for output from an output line buffer 4 to an output section 8, the controller 9 transmits an address signal (g) and a read/write signal (h) to an input line buffer 2 newly to output the picture data of the line where the error occurs from the head. The controller 9 outputs a gate selecting signal (m) and opens an AND circuit 5. Thus, the line in error by the device 3 outputs the picture data (b) in place of the compressed data (d) from the circuit 5 to the output section 8 via an OR circuit 7. In this case, the controller 9 informs that the output data (e) is the data (b) to the output section 8.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an image data compression device in an image processing device.

[Prior art]

Compression devices are recently widely used not only in facsimiles but also in devices that handle image data. For example, in intelligent copying, it is used to save memory capacity when storing image data in a file for editing or the like.

In such a compression apparatus, the conventional measures taken when an error occurs during compression processing are: (1) Processing the same line again. ■That line could be made into white data as an error line.

However, according to method (■) above, the processing time is long;
This makes it unsuitable for image processing devices that require high-speed processing.

On the other hand, according to method (2) above, although there is no problem with the processing time, there are problems such as information being missing in the reproduced image.

〔the purpose〕

SUMMARY OF THE INVENTION It is an object of the present invention to provide an image data compression device which eliminates the above-mentioned problems of the prior art and does not cause wasted processing time or lack of information after reproduction. shall be.

〔composition〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings, taking as an example a case where the present invention is applied to a facsimile.

FIG. 1 shows a block diagram of a data compression device according to an embodiment of the present invention, in which 1 is an input section, 2 is an input line buffer, 3 is a compression device, 4 is an output line buffer,
5 and 6 are AND circuits, 7 is an OR circuit, 8 is an output section, and 9 is a controller.

In this embodiment, the input unit 1 specifically represents a scanner unit of a facsimile machine, but the present invention is not limited to this, and may be any device that handles image data, such as an OCR, an image data storage memory, or a character generator. Anything is fine. Similarly, in this embodiment, the output section 8 specifically represents the modem section of the 7-axis IJ device, and the output data is sent from this modem section to the line via the NCU, and then transmitted to the other party's facsimile device. However, the present invention is not limited to this, and the output unit 8 may be a data storage device, a computer, etc., and the output data from the OR circuit 7 may be directly transferred to these devices.

With the above configuration, image data a input from the input section 1 is processed as shown in chart 70 in FIG. 2 and output to the output section 8. That is, the controller 9 monitors the free space of the memory of the input line amplifier 2, and when there is free space in the memory capable of storing one line of image data, the controller 9 sends a control signal f to the input section to store the image data a. request input. Based on this, the input section 1 outputs image data a. When the input line buffer 2 receives this image data a, it reads the address signal g output from the controller 9.
Based on the write signal, this image data a is sequentially written to a predetermined storage location.

Similarly, input line buffer 2 is the 1 that was written earlier.
Image data b for each line is read out sequentially. The compression device 3 starts operating based on the activation signal I from the controller 9, and starts operating as M H (Modified Huffman).
The input image data b is sequentially compressed according to an encoding method such as or MR (Modified Read). Based on the address signal from the controller 9 and the read/write signal t, the output line buffer 4 sequentially writes compressed data C sequentially outputted from the compression device 3 to a predetermined storage location, and at the same time sequentially reads out the previously written compressed data. To go.

The read compressed data d is output from the OR circuit 7 to the output unit 8 as output data e via the dart 6 which is opened by the output of the f-) selection signal U from the controller 9. At the same time, the controller 9 outputs a control signal 0 to inform the output unit 8 that this data e is compressed data d.

Normally, by repeating the above processing, the image data a for each line input from the input section 1 is sequentially compressed by the compression device 3 and outputted to the output section as output data.

During this process, if a compression error occurs in the compression device 3, an error signal j is output from the compression device 3 to the controller 9. Immediately upon receiving this error signal, the image data a drops the activation signal l to stop the processing of the compression device 3. Then the output liner.

When one line of compressed data has been output from the F4 to the output section 8 via the AND circuit 6 and the OR circuit 7, the controller 9 sends the address signal g and the read signal to the input 2 imper and F2 (5). Send a write signal to output the image data of the line where the error occurred again from the beginning. Further, the controller 9 outputs the dart selection signal m to open the AND circuit 5.

As a result, image data b is output from the AND circuit 5 to the output section 8 via the OR circuit 7 in place of the compressed data d for the line in which the error occurred in the compression device 3. Further, at this time, the controller 9 notifies the output section 8 that the output data e is the image data b using the control signal 0.

In this way, when an error occurs in the compression device 3, the compression process is immediately stopped and the image data b is output to the output unit 8, thereby saving the effort of repeatedly performing the compression process and reducing the processing time. is shortened. Furthermore, since error lines are not output as white data, missing information in the reproduced image is also prevented.

〔effect〕

As described above, according to the present invention, it is possible to obtain a high-speed, highly reliable image data compression device that reduces processing time and is free from (6) when information is missing in a reproduced image.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an image data compression device according to an embodiment of the present invention, and FIG.
0 - Chart. l...Input section, 2...Input 2 inverter, 3...
・Compression device, 4... Output line buffer, 5, 6...
・AND circuit, 7...OR circuit, 8...output section, 9
···controller. (7)

Claims (1)

[Claims] In an image rotor compression device that sequentially takes out image data input to an input line buffer into a compression device and compresses it, and outputs the compressed data via an output line buffer, an error occurs in the compression device. 1. An image data compression device comprising: means for determining whether the image data or the compressed data is to be output based on the determination result; and output data selection means for selecting whether to output the image data or the compressed data.