JPS6276867A - Image data processing device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image data processing device that performs processing focusing on the run length of binary image data.

[Conventional technology]

2. Description of the Related Art Conventionally known image data processing devices of this type include, for example, an image reading device equipped with a ccn (charge coupled device), a dot matrix type image printer, and the like. Here, a facsimile machine using these will be explained as an example.

Conventional facsimile machines decode image signals obtained via communication lines and supply all pixel data to a printer. Similarly, when transmitting an image to another facsimile machine, all pixel data read by CCo or the like is encoded.

[Problem that the invention seeks to solve]

Therefore, with regard to image signals obtained via communication lines, images that are too small to be recognized by oneself are also printed, resulting in the disadvantage that a clear reproduced image cannot be obtained.

Also, when reading a document image, minute images (for example,
Since the system sequentially encodes even the dirt on the background, it not only requires extra reading time, but also has the disadvantage that if an image memory is provided, the storage capacity is wasted.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an image data processing device that improves image quality and gradually reduces the amount of data by forming image data while ignoring discretely existing minute image areas.

[Means for solving problems]

The present invention includes a means for detecting a run length of image data, and a processing means for inverting a data value related to the run length when the run length is less than or equal to a predetermined length. It is configured to send binary image data.

〔Example〕

Hereinafter, the present invention will be described in detail based on examples.

FIG. 1 is a schematic configuration diagram of an image data processing apparatus according to the present invention, and shows a means C-C for detecting run length of image data.
t, and processing means C-2 for inverting the data value related to the run length when the run length is less than or equal to a predetermined length, and transmitting binary image data from the processing means C-2. do.

FIG. 2 is a block diagram showing an embodiment of a facsimile apparatus to which the present invention is applied. In this figure, 2 is a memory that stores image data processed by a central processing unit (CPU) s, which will be described later, or data used when executing processing by the CPU.

3 is image data correction processing (described in detail in Fig. 3)
This is a keyboard for instructing whether to perform or not.

4 is a display device that displays input data on the keyboard 3, and 5 is a communication device that connects the communication line 6 and the present facsimile machine for communication.

7 is a printer that reproduces the received image information, and 8 is a decoding device that decodes the image data and supplies a print signal to the printer 7.

Further, the CPU 9 inputs the image data received by the communication device 5, calculates the run length, and distinguishes the data into data representing a visible area and data representing an invisible minute area.

Then, for data representing an invisible area, level inversion is performed so that the data matches the data immediately preceding the data, and the data is integrated. Furthermore, this CPU 9 has a keyboard 3, a display device 4. Printer 99 communication device 5. It controls various operations of the decoding/encoding device 8 or the document reading section (not shown).

FIG. 3 is a flowchart showing the image data processing procedure of the facsimile machine shown in FIG. 2, and FIG. 4 is a bit configuration diagram showing an example of a run length code used in this processing procedure.

In step S2 shown in FIG. 3, image data transmitted via the communication line 6 is received by the communication device 5.

Then, in step S3, the CPU 9 receives the image data and converts it into a run-length code. That is, the CPU fl detects the number of consecutive pieces of data representing white or black in the transmitted image data, and creates a run length code as shown in FIG.

In the next step S4, the image data length (number of consecutive "0" or "l") represented by the run length code is determined.

When the image data length is longer than "2", the image data length and the previous data length (if an image data length of "2" or less occurs first, the image data length is (refer to step S12) which becomes the previous data length, and then in step S6 the variable "
"previous data length" is cleared to "O".Furthermore, in step S7
Now, the run length code including the added image data length is stored in the memory 2 (see FIG. 2).

Further, if it is determined in step S4 that the image data length is "2" or less, the image data can be considered to be data representing an invisible area. For example, if one pixel is represented by 1/18 mm, changes in the image up to 1/8 mm cannot be discerned with the inner eye even if printed out. Therefore, in order to integrate the image data with the previously generated visible data, in step S12, the image data length determined to be invisible data is added to the "previous data length", and the next Proceed to step.

As described above, steps 82 to S8 are repeatedly executed until the last received data processing is completed.

When it is determined in step S8 that the processing of the received data has been completed, the run-length code stored in the memory 2 is sent to the printer 7 via the decoding device 8 (step S8), and the image is printed out. (step 510).

Note that in step S4 of the flowchart shown in FIG. 3, it is determined whether the run length of the image data is 2" or less, but without being limited to this run length "2", it is possible to transmit the image data via the line. It is also possible to change the run length as appropriate depending on the image being received.In this case, the run length may be changed using the keyboard 3.

Furthermore, in the embodiments shown in FIGS. 2 to 4, the case where an image signal is received and the image is reproduced has been described, but in the case where the image signal obtained by reading the original drawing is run-length encoded and transmitted. Of course, the present invention can also be applied to.

〔Effect of the invention〕

As explained above, according to the present invention, when the run length of image data is small, it is possible to ignore that image data and match it with the data of adjacent pixels, thereby increasing the compression rate of zero image data. It is possible to obtain special effects such as: ■ It is possible to save image memory: ■ It is possible to improve the quality of the reproduced image by removing noise components.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of an image data processing device according to the present invention, FIG. 2 is a block diagram showing an embodiment of a facsimile device to which the present invention is applied, and FIG. 3 is for explaining the operation of FIG. FIG. 4 is a bit configuration diagram of a run-length code used in the embodiment shown in FIG. 2...Memory, 3...Keyboard, 4...Display device, 5...Communication device, 6...Communication line, 7...Printer, 8...Decoding device, 9... cpu. Figure 2 Special opening RG2-76867 (4) Figure 3 Figure 4

Claims (1)

[Claims] 1) comprising means for detecting a run length of image data; and processing means for inverting a data value related to the run length when the run length is less than or equal to a predetermined length; An image data processing device characterized in that binary image data is sent from the processing means.