JP2849219B2 - Color image processing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color image processing apparatus used in a color copying machine, a color facsimile and the like.

[0002]

2. Description of the Related Art In recent years, devices for printing and displaying digital color images, such as color copiers and electronic still cameras, have been put into practical use. A device that performs a predetermined process on a color image has been developed. For example, PDC (Peripheral Device Controller) proposed by the present applicant.
In the above, a desired image is obtained by performing a blanking process of a predetermined color on a color image.

[0003]

In the above-mentioned PDC, a centering process can be performed on a color image.
This is the three primary colors RGB (Re
d, Green, Blue) and CMYK (Cyanide, Magenta, Y)
Since one of the colors (e.g., ellow, black) is specified and the blanking process is performed, the formed image tends to have an unnatural color tone.

[0004]

According to the first aspect of the present invention,
Data development means for developing image data digitally represented for each primary color on a hue space classified in advance into a plurality of hue areas in accordance with the hue is provided. A hue designating unit for designating at least one hue area; a data extracting unit for extracting image data in the hue area designated by the hue designating unit from the hue space; and an image extracted by the data extracting unit. Image processing means for performing a predetermined data conversion process on the data is provided.

According to a second aspect of the present invention, there is provided a noise countermeasure unit for changing image data to be transferred to the image processing unit by referring to image data around the image data extracted by the data extraction unit.

According to a third aspect of the present invention, there is provided an image processing means for performing a blanking process on input image data.

According to a fourth aspect of the present invention, there is provided an image processing means for performing a shading process on input image data.

According to a fifth aspect of the present invention, there is provided a conversion color designating means for designating a predetermined color, and the image data subjected to the blanking processing by the image processing means is replaced with the color designated by the conversion color designating means. Color changing means is provided.

[0009]

According to the first aspect of the present invention, the data expanding means expands the image data in a hue space previously classified into a plurality of hue areas in accordance with the hue, and at least one hue in the hue space in which the image data is expanded. The area is designated by the hue designation means, the image data in the designated hue area is extracted from the hue space by the data extraction means, and the extracted image data is subjected to predetermined data conversion processing by the image processing means. In addition, data conversion processing can be performed on image data with respect to a predetermined hue.

According to a second aspect of the present invention, the noise reduction means refers to image data surrounding the image data extracted by the data extraction means and changes the image data to be transferred to the image processing means, thereby performing data conversion processing. It is possible to prevent isolated points and extraction errors from occurring in the extracted image data.

According to the third aspect of the present invention, the image processing means performs the centering process on the input image data, so that the image data can be centered on a predetermined hue.

According to the fourth aspect of the present invention, the image processing means performs the shadowing process on the input image data, whereby the image data can be subjected to the shadowing process with respect to the predetermined hue.

According to a fifth aspect of the present invention, the color changing means replaces the image data subjected to the centering processing with the color designated by the conversion color designating means, so that the image data has a desired hue with respect to a predetermined hue. Can be changed to

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A color image processing apparatus according to the first and third aspects of the present invention will be described with reference to FIGS. First, in the color image processing apparatus 1 of the present embodiment, as illustrated in FIG. 1, for example, a data line to which image data digitally represented for each primary color is transferred, such as an output line of a color scanner, is transferred. , A data extracting means 3 for expanding image data on the hue space 2, and a data extracting means 5 to which a hue specifying means 4 such as a keyboard is connected are connected to the data expanding means 3. The data extracting means 5 is connected to an image processing means 6 for performing a blanking process. The image processing means 6 and the data input means synthesize and edit each image data. Image editing means 7 is connected. These various means are formed, for example, by firmware. Here, as shown in FIG. 2, the hue space 2 is classified into a plurality of hue areas in advance according to hues, and an area number is set for each hue area.
Further, the image processing means 6 has a structure in which a NAND 8 and an AND 9 are combined as illustrated in FIG. 3, and as illustrated in FIG.
And the latch 11 are sequentially connected. The image editing means 7 has a structure in which a NAND 13, an inverter 14, and an AND 15 are combined as illustrated in FIG.

In such a configuration, in the color image processing apparatus 1, for example, when digital image data expressed by 8 bits for each color of RGB is input, the data is expanded by the data expanding means 3 to a * b *. Is expanded to the hue space coordinates consisting of At this time, for example, the data expanding means 3 outputs constants X0, Y0, Z0 and stimulus values r,
According to g and b,

A * = 500 * ｛(X / X0) ^1/3 − (Y / Y
0) ^1/3 {b * = 200 *} (Y / Y0) ¹ /3-(Z / Z
0) ^1/3演算 X = 0.49000 * r + 0.31000 * g + 0.20000 * b Y = 0.17697 * r + 0.81240 * g + 0.01063 * b Z = 0.00000 * r + 0.01000 * g + 0.99000 * b Perform processing.

Then, a * b obtained as described above is obtained.
Since the data of * is expanded in the hue space 2 and converted into an area number, when a predetermined area number is designated by the hue designation means 4, the image data in the hue space 2 of this area number is given a hue by the data extraction means 5. Extracted from space 2. Then, the extracted image data is transferred to the image processing means 6 as data to be processed, and
Accordingly, the data is expanded into a memory map 16 as illustrated in FIG. 6 and is converted to “0” only when all the peripheral data are “1”. Then, as shown in FIG. 7, the hollow data subjected to the hollow processing by such conversion is obtained by partially deleting the image shown in FIG. 7A as shown in FIG. 7B. The data is transferred to the image editing means 7 together with the processing target data and the image data on which the blanking process has not been performed. Therefore, the image editing means 7 outputs image data other than the data to be processed, outputs the image data when the hollow data is “1”, and outputs the image data when the hollow data is “0”. In this case, "0" is output. By doing so, the image data of the digitally represented color is subjected to the centering process with respect to the predetermined hue, and the color tone is good and beautiful compared to the case where the centering process is performed with one of the three primary colors. An image will be obtained.

Next, an embodiment of the present invention will be described with reference to FIGS. First,
The color image processing device 17 is provided with a noise countermeasure unit including a peripheral data reference unit 18 and an extracted data change unit 19 between the data extraction unit 5 and the image processing unit 6. The aforementioned color image processing apparatus 1
Is the same as The peripheral data reference means 1
8 has a large number of line memories 20 as illustrated in FIG.
And the latch 21 are sequentially connected, and the extracted data changing means 19 has a structure as shown in FIG.
It has a structure in which OR22 and NAND23 are combined.

In such a configuration, in the color image processing apparatus 17, the image data around the data to be processed extracted by the data extraction means 5 is stored in the peripheral data reference means 1.
The extracted data changing means 19 changes the data to be processed according to the contents of the image data. By doing so, in the color image processing device 17, the occurrence of an isolated point or an extraction error is prevented, and the centering process is performed in consideration of the reading noise and the extraction noise.

Next, an embodiment of the present invention will be described with reference to FIGS. First, in the color image processing device 24, the shadowing unit 26 included in the image processing unit 25 has a structure in which a plurality of line memories 27 and latches 28 are alternately connected as illustrated in FIG. As illustrated in FIG. 13, the memory map 29 expanded thereby is realized by the OR 30 as illustrated in FIG. 14. Also, the image editing means 3
1 is connected to the inverter 32 and the AN as illustrated in FIG.
D33 and a selector 34.

In such a configuration, in the color image processing apparatus 24, the processing target data transferred to the image processing means 25 is, as illustrated in FIG. By adding an image, the image is shaded as shown in FIG. 3B to form shadowed data, which is transferred to the image editing means 31 together with the processing target data and image data which have not been subjected to this processing. Therefore, the image editing unit 31 outputs image data other than the data to be processed, and as to the data to be processed, the shadowing data is “1”.
In this case, the image data is output, and when the hollow data is "0", the shadowing data is output. In this way, the digitally expressed color image data is shaded with respect to a predetermined hue, and the color tone is good and beautiful compared to the case where the shadow is processed with one of the three primary colors. An image will be obtained.

Next, an embodiment of the present invention will be described with reference to FIGS. 17 and 18. First,
As shown in FIG. 17, in the color image processing device 35, a conversion color designating unit 36 such as a keyboard is connected to an image editing unit 37 which is also a color changing unit. As illustrated, the inverter 3
8 and an AND 39 and a selector 40.

In such a configuration, in the color image processing apparatus 35, when a predetermined conversion color is specified by the conversion color specifying unit 36, the image editing unit 37 outputs image data other than the processing target data, and outputs the image data. As for the data,
When the hollow data is "1", the image data is output, and when the hollow data is "0", the converted color data is output.
In this manner, the digitally expressed color image data can be changed to a desired hue with respect to a predetermined hue. A beautiful image will be obtained.

[0023]

According to the first aspect of the present invention, there is provided a data developing means for developing image data digitally represented for each primary color in a hue space classified in advance into a plurality of hue areas according to the hue. Hue designating means for designating at least one hue area in a hue space in which image data is developed by the developing means, and data extraction for extracting image data in the hue area designated by the hue designating means from the hue space Means for performing predetermined data conversion processing on the image data extracted by the data extraction means, the image data can be subjected to data conversion processing with respect to a predetermined hue. This has an effect that a beautiful image with a good color tone can be obtained, as compared with the case where the data conversion processing is performed.

According to a second aspect of the present invention, there is provided a noise countermeasure means for changing image data to be transferred to the image processing means with reference to image data around image data extracted by the data extraction means. It is possible to prevent isolated points and extraction errors from occurring in the converted image data, and to achieve data conversion processing in consideration of reading noise and extraction noise.

According to the third aspect of the present invention, since the image processing means for performing the centering process on the input image data is provided, the centering process can be performed on the image data with respect to a predetermined hue. This has an effect that a beautiful image having a good color tone can be obtained, as compared with the case where the blanking process is performed.

According to the fourth aspect of the present invention, since image processing means for performing a shadowing process on input image data is provided, the image data can be subjected to a shadowing process with respect to a predetermined hue. This has an effect that a beautiful image with a good color tone can be obtained as compared with the case where the shadowing process is performed.

According to a fifth aspect of the present invention, there is provided a conversion color designating means for designating a predetermined color, and the image data subjected to the blanking processing by the image processing means is replaced with the color designated by the conversion color designating means. By providing the color changing means, it is possible to change the image data to a desired hue with respect to the predetermined hue, so that a beautiful image with a good color tone is obtained as compared with a case where the three primary colors are hollowed out. It has effects such as being able to do.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the invention described in claims 1 and 3;

FIG. 2 is a conceptual explanatory diagram of a hue space.

FIG. 3 is a circuit diagram of a main part.

FIG. 4 is a circuit diagram of a main part.

FIG. 5 is a circuit diagram of a main part.

FIG. 6 is a conceptual explanatory diagram of a memory map.

FIG. 7 is a front view of an image.

FIG. 8 is a block diagram showing an embodiment of the invention described in claims 1, 2 and 3;

FIG. 9 is a circuit diagram of a main part.

FIG. 10 is a circuit diagram of a main part.

FIG. 11 is a block diagram showing an embodiment of the invention described in claims 1 and 4;

FIG. 12 is a circuit diagram of a main part.

FIG. 13 is a conceptual explanatory diagram of a memory map.

FIG. 14 is a circuit diagram of a main part.

FIG. 15 is a circuit diagram of a main part.

FIG. 16 is a front view of an image.

FIG. 17 is a block diagram showing an embodiment of the invention described in claims 1, 3 and 5;

FIG. 18 is a circuit diagram of a main part.

[Explanation of symbols]

 1, 17, 24, 35 color image processing device 2 hue space 3 data expanding means 4 hue specifying means 5 data extracting means 6, 25 image processing means 18, 19 noise suppression means 36 conversion color specifying means 37 color changing means

Claims (5)

(57) [Claims] 1. A data developing means for developing image data digitally represented for each primary color in a hue space classified in advance into a plurality of hue areas according to hue, and the image data is developed by the data developing means. Hue designating means for designating at least one hue area in the hue space; data extracting means for extracting image data in the hue area designated by the hue designating means from the hue space; A color image processing apparatus comprising: image processing means for performing a predetermined data conversion process on the processed image data. 2. The apparatus according to claim 1, further comprising noise suppression means for changing image data to be transferred to the image processing means by referring to image data surrounding the image data extracted by the data extraction means. Color image processing device. 3. A color image processing apparatus according to claim 1, further comprising image processing means for performing a blanking process on input image data. 4. A color image processing apparatus according to claim 1, further comprising an image processing means for performing a shading process on the input image data. 5. A conversion color designating means for designating a predetermined color, and a color changing means for replacing the image data subjected to the blanking processing by the image processing means with the color designated by the conversion color designating means. 4. The color image processing apparatus according to claim 3, wherein: