JPH07170418A - Image data processor - Google Patents

Abstract

PURPOSE:To provide an image data processing technique by which transmission/ reception of color data between plural kinds of data systems whose color expression differs from each other. CONSTITUTION:This image data processor is provided with an image information conversion section 108 comprising an EOR circuit 103 inverting input data based on a detection signal 102a from a detection section 102 detecting a bit pattern requiring conversion interposed between picture memories 101 and in a front stage of a flip-flop 104, a comparator circuit 105 and a shift table 107 compressing the bit data stored in the memory 101 into run length code data. Since the conversion processing by the image information conversion section 108 is implemented in synchronism with a timing of compression processing from bit data into code data, the performance of the processing unit is not deteriorated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image data processing technique, and more particularly, to a technique effective when applied to an information processing device handling color image data.

[0002]

2. Description of the Related Art In recent years, office automation equipment such as personal computers
Many devices handle image data. Image data is huge data of hundreds of kilobytes to several megabytes when color information is expressed in bits.
Data compression is performed by a method such as coding a continuous length of "0" and "1" to improve the efficiency of storage and handling. Furthermore, recently, the compressed color data is exchanged between various software, and the image data created by a personal computer or the like is read by another OA device to be printed so that image data compatibility is required. Systems are becoming popular.

[0003]

However, even if the image data compression method and the like are unified, if the color expression methods are different, it is impossible to exchange color data between the two parties. That is, the TI used in recent OA software
FF (Tag Image File Format) format data is (R, G, B) when compared with generally known G4 data.
When (0,0,0), the latter is "white" and the former is "black", and the color expressions are different, and there is a problem that it cannot be exchanged between software.

An object of the present invention is to provide an image data processing technique capable of transmitting / receiving color data between a plurality of types of data systems having different color expressions.

The above and other objects and novel features of the present invention will be apparent from the description of this specification and the accompanying drawings.

[0006]

Of the inventions disclosed in the present application, a representative one will be briefly described below.
It is as follows.

That is, according to the first aspect of the invention, in the image data processing device that handles the first and second data systems that represent at least a part of the color information with different bit patterns, the first data system and the second data system are used. It is provided with a conversion means for performing mutual conversion of bit patterns so that color information is preserved before and after data conversion between the data systems.

According to a second aspect of the present invention, in the image data processing apparatus according to the first aspect, the compression means for converting the bit pattern in the first data system into code data by a desired algorithm after the conversion means. It is provided with a data compressing means which is operated to form a second data system.

According to a third aspect of the present invention, in the image data processing apparatus according to the first aspect, a data decompressing means for expanding the code data of the second data system into a bit pattern is provided before the converting means. It is a thing.

[0010]

According to the image data processing technique of the present invention as set forth in claim 1, the converting means has the first and second parts in advance.
In this data system, a specific bit pattern that represents different color information with the same bit pattern is stored, and the bit pattern for each pixel from the first or second data system is converted to the specific bit pattern. Whether or not they match with each other is monitored, and if they match with each other, an operation of converting to a corresponding bit pattern in the second or first data system is performed so that the color information is stored.

This makes it possible to exchange color data between a plurality of types of data systems having different color expressions.

[0012]

Embodiments of the present invention will now be described in detail with reference to the drawings.

(Embodiment 1) FIG. 1 is a block diagram showing an example of the configuration of an image data processing apparatus according to an embodiment of the present invention, and FIGS. 2 and 3 show the image data processing apparatus according to the present embodiment. It is a conceptual diagram which shows an example of the relationship of several image data handled.

As illustrated in FIG. 1, the image data processing apparatus of this embodiment includes a plurality of image memories 101 in which bit data corresponding to each of R, G, and B are stored, and from this image memory 101. The color information conversion unit 108 that inputs the data 109 read in parallel, performs a predetermined conversion process and outputs the data 110 in parallel, and a plurality of flip-flops arranged in each series of the output data 110. And a shift circuit 107 and the like.

Further, the color information conversion unit 108 inputs the data 109 from the image memory 101 in parallel and outputs the detection signal 102a when a specific bit data is input, and the data 109 is one input. age,
It is composed of a plurality of EOR circuits 103 which take the detection signal 102a as the other input, take the exclusive OR of the two, and output it as the data 110.

FIG. 2 shows TI which is an example of different color information.
The color information shown by each bit data of R, G, and B in the FF format and the G4 format is shown. In the figure,
It is expressed in a specific bit pattern 201 when (R, G, B) = (0,0,0) and a specific bit pattern 202 when (R, G, B) = (1,1,1). The colors are different.

In FIG. 3, R, G, B bit data 30
6 to 308 and the corresponding code data 303 to 305 when the respective data are compressed are shown.

The R, G, and B bit data in the image memory 101 correspond to the bit data 306 to 308,
The code data output from the shift table 107 is
It corresponds to the code data 303 to 305.

As shown in FIG. 3, the code data output from the shift table 107 is data indicating the continuous length of the bit string of "0" and "1" (hereinafter, referred to as run length). Therefore, the code data (run length) required in this embodiment is the code data 30.
3 to 305.

However, the data area 301 and the data area 3
As indicated by 02, R in the image memory 101,
When the G and B bit data is G4 format data,
If this data is directly passed to the TIFF format for processing, white and black will be reversed and correct color expression will not be possible.

Therefore, in this embodiment, the color information conversion unit 10
In step 8, the conversion process is performed such that the color information of the G4 format bit data is saved, and the operation of compressing into the TIFF format code data is performed.

An example of the operation of the image data processing device of this embodiment will be described below.

In the present embodiment, G illustrated in FIG.
Since the conversion between the 4 format and the TIFF format is performed, the detection unit 102
Is (R, G, B) = (0,0,0), (1,1,1)
Is a logic circuit for detecting.

When the target pattern is detected, the detection unit 10
2 outputs "1" to the EOR circuit 103 as the detection signal 102a. As a result, the EOR circuit 103
(0, 0, 0) of the data 109 that becomes the input of (1,
(1,1) is converted (inverted) into (0,0,0) to become data 110, and the EOR circuit 103 is formed.
Is output from.

The flip-flop 104 latches the data 110 with a bit-corresponding clock.

The comparison circuit 105 includes a flip-flop 10
Data 111 latched in 4 and data 11 before latching
When 0 is compared and the bit data is inverted from “0” → “1” or “1” → “0”, “1” is output as the inversion detection signal 105a to the counter 106 and the shift table 107 in the subsequent stage. To do.

The counter 106 has an inversion detection signal 105a.
It is reset by, and thereafter, it counts up with the clock corresponding to the bit. The shift table 107 loads the count value of the counter 106 by the inversion detection signal 105a and stores it as code data.

As described above, in the present embodiment, the color information conversion unit 108 detects a target pattern, converts the data into a pattern in which color information is stored, and then sends the pattern to the shift table 107. The G4 format data 109 stored in the memory 101 can be compressed into different TIFF format code data while the color information is stored.

In the above example, as shown in FIG. 2, it is a relatively simple case where white and black data are interchanged as they are, but the color information conversion unit 108 is exemplified as shown in FIG. 6, for example. By replacing the ROM, it is possible to realize conversion in a plurality of types of data systems that require more complicated conversion.

That is, the information necessary for conversion is written in advance in this ROM, the uncompressed data 109 is input, the conversion operation is performed based on the written information, and then the next data 110 is obtained. To output to.

(Embodiment 2) FIG. 4 is a block diagram showing an example of the configuration of an image data processing apparatus which is another embodiment of the present invention, and FIG. 5 is handled by the image data processing apparatus of this embodiment. It is a conceptual diagram which shows an example of image data.

In this embodiment, a case will be described in which the process of expanding the TIFF format data obtained in the first embodiment into the G4 format is performed.

The image data processing apparatus according to the present embodiment has R,
A plurality of shift tables 401 to which the G and B code data are input, a plurality of counters 402 and flip-flops 403 provided corresponding to the respective outputs of the shift tables 401, and output from the flip-flops 403. A color information conversion unit 416 which receives R, G, B data 413 as input and outputs as corresponding data 414;
A plurality of DMA transfer units 406 to 408 provided corresponding to each data 414 of R, G, B, and a plurality of image memories 409 storing each bit data of R, G, B.
~ It is composed of the image memory 411 and the like.

The color information conversion unit 416 inputs the data 413 in parallel and outputs the detection signal 405a when the specific bit data is input, and the data 41.
3 is used as one input and the detection signal 405a is used as the other input, and is composed of a plurality of EOR circuits 404 which take the exclusive OR of both and output as data 414.

The detector 405, as illustrated in FIG.
In the conversion between the G4 format and the TIFF format, the specific bit pattern 201 and the specific bit pattern 202 in which the color information is not stored are detected, and "1" is output to the detection signal 405a.

An example of the operation of this embodiment will be described below.

Code data 50 as illustrated in FIG.
5 to 507 (run length) are respectively input to the shift table 401, the run length value is sent from this to the counter 402, and the counter 402 counts the run length with a clock corresponding to bits.

When the counting is completed, the next data request signal 412 is output, and the run length is automatically input to the counter 402. In addition, this data request signal 412
Is also a switching signal of each bit data of R, G and B, and is therefore input to the flip-flop 403 of the next stage.
Each time the data request signal 412 is input, the flip-flop 403 alternately changes the data from “0” → “1” → “0”.

The detecting section 405 inputs the R, G, B data 413 converted into bit data, and monitors a bit data pattern that needs to be converted for storing color information.

When the target pattern (data area 501 in FIG. 5) is detected, the detection unit 405 causes the EOR circuit 4
"1" is output as a detection signal 405a to 04. As a result, (0,0,0) of the data 413 is converted (inverted) into (1,1,1) and (1,1,1) into (0,0,0), and becomes data 414. Is output.
The DMA transfer unit 406 receives this data 414,
R, G, B data 415 (bit data 502
To 504) are DMA-transferred to the image memory 409.

As a result, in the image memories 409 to 411, all the color information including white and black color information that is different between the pixels is stored in the image memories 409 to 411 when the pixel is expanded (converted) from the TIFF format to the G4 format. To be done.

The color information conversion unit 416 can be constructed by a ROM as shown in FIG. 6 as in the case of the first embodiment.

In recent years, the TIFF format data used as a color expression in OA equipment and the G4 format data defined by the CCITT standard possessed by a dedicated image processing machine are used as they are to represent white and black. However, the operations such as bringing the TIFF format color data into a dedicated image processing machine for printing cannot be performed. However, according to the image data processing apparatus illustrated in the first and second embodiments, , TIFF format and G4 format can be mutually converted while saving color information, and the high-quality printing function of the dedicated image processing machine can be easily used from the side of other OA equipment. it can.

Further, by implementing the color information conversion unit and the like by hardware, it can be incorporated in the process of compression and decompression processing, and there is no fear of degrading the performance of the image data processing apparatus.

Although the invention made by the present inventor has been specifically described based on the embodiments, the invention is not limited to the embodiments and various modifications can be made without departing from the scope of the invention. Needless to say.

[0046]

The effects obtained by the typical ones of the inventions disclosed in the present application will be briefly described as follows.
It is as follows.

That is, according to the image data processing apparatus of the present invention, it is possible to exchange color data between a plurality of types of data systems having different color expressions.

[Brief description of drawings]

FIG. 1 is a block diagram showing an example of the configuration of an image data processing apparatus that is an embodiment of the present invention.

FIG. 2 is a conceptual diagram showing an example of a relationship between a plurality of image data handled in the image data processing device.

FIG. 3 is a conceptual diagram showing an example of a relationship between a plurality of image data handled in the image data processing device.

FIG. 4 is a block diagram showing an example of a configuration of an image data processing device which is another embodiment of the present invention.

FIG. 5 is a conceptual diagram showing an example of image data handled by the image data processing apparatus.

FIG. 6 is a conceptual diagram showing an example of a ROM that constitutes a color information conversion unit.

[Explanation of symbols]

 Reference Signs List 101 image memory 102 detection unit 102a detection signal 103 EOR circuit 104 flip-flop 105 comparison circuit 105a inversion detection signal 106 counter 107 shift table 108 color information conversion unit 109-111 data 201, 202 specific bit pattern 301, 302 data region 303-305 Code data 306 to 308 bit data 401 Shift table 402 Counter 403 Flip-flop 404 EOR circuit 405 Detection unit 405a Detection signal 406 to 408 DMA transfer unit 409 to 411 Image memory 412 Data request signal 413 to 415 data 416 Color information conversion unit 501 data Area 502 to 504 bit data 505 to 507 code data

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Claims (3)

[Claims] 1. An image data processing device for handling first and second data systems which express at least a part of color information in different bit patterns, wherein the image data processing device comprises a first data system and a second data system. An image data processing apparatus, comprising: a conversion unit that performs mutual conversion of the bit patterns so that the color information is stored before and after data conversion between them. 2. A compression operation for converting the bit pattern in the first data system into code data by a desired algorithm is performed at a stage subsequent to the conversion means to perform the second operation.
2. The image data processing apparatus according to claim 1, further comprising a data compression unit that is a data system of the above. 3. The data decompression means for expanding the code data of the second data system into the bit pattern is provided in a stage preceding the conversion means.
The image data processing device described.