JPH0353269A - Picture processor - Google Patents

Abstract

PURPOSE:To surely designate a range of a color to be color-converted and to confirm color registration by outputting color-registered approximate data when its color is converted. CONSTITUTION:A first selector 6 selects a color patch 4, while a second selector 8 selects the first selector 6. The output of the color patch 4 is input to a first gamma-correction part 9 via the first selector 6 and the second selector 8. Upon the completion of prescanning, the color patch 4 is output. At this time, the data subjected to the first gamma-correction 9 is output according to color-registered data, and therefore the color patch 4 is output in a color approximate to the color-registered data. A code is designated for the color patch 4, and the registered color is displayed by operational guidance. Thus, color registration can be confirmed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image processing apparatus that converts multivalued color data into other color data, such as a digital color copying machine.

[Conventional technology]

Specify any point on the document and memorize the density of the image data,
A color image processing device that allows a certain range of upper and lower limits to be used as an extraction (color) color for color conversion is known, for example, as disclosed in Japanese Patent Application Laid-Open No. 192863/1983. ing.

(Problems to be Solved by the Invention) In the above-mentioned conventional technology, the color image processing Vjt position is different from monochrome binary data and handles multi-value image data, so almost constant color data in the document is There is a demand for conversion to color data.For this reason, conventional methods have been used to set the density range by specifying almost the same density area of the original and recording the minimum and maximum color data from the scanner unit. With this method, colors may be different from the expected colors due to the accuracy of document position specification and image data noise (scratches, dust, etc.), and colors may be selected from color patches (color samples), etc. According to this method, there was a problem that the colors were slightly different due to the adhesion of dust or dirt or because the paper and ink of the color patches were not made of the same material.

SUMMARY OF THE INVENTION An object of the present invention is to provide an image processing apparatus that specifies an arbitrary point on a document and generates a color patch centering on the color data of the arbitrary point, thereby setting a density range and performing color conversion. It is about providing.

[Means to solve the problem]

The above object is to provide a color image reading means, a color image recording means, and an almost constant arbitrary point of color data in an image processing apparatus such as a digital color copying machine that converts multivalued color data into other color data. a position specifying means for specifying a point, a storage means for storing color data of a point specified by the position specifying means, a color patch generating means for generating a color patch centering on the color data stored in the storage means; a density range specifying means for selecting and specifying an arbitrary density range by the color patch generated by the color patch generating means; and extraction of color conversion of color data in the position specifying means using the density range specified by the density range specifying means. This is achieved through the precepts that have the means to create colors.

According to another aspect, the above object includes a color patch output means for generating and outputting a color patch in an image processing apparatus that converts multivalued color data into other color data, such as a digital color copying machine; Color specifying means for specifying an arbitrary color from among the color data of the color batches output by the color patch output means; and specified color output means for generating and outputting the arbitrary color specified by the color specifying means in a predetermined area. This is achieved through a precept that includes the following.

[Effect]

The image processing device operates to register the color of the black portion of the document as an extracted color, and performs color conversion by registering the color of color data.

The image processing device also operates to output a color patch, set a conversion area, and set conversion color data.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a circuit block diagram illustrating an embodiment of an image processing apparatus according to the present invention, and FIG. 2 is a block diagram showing the basic structure of the image processing apparatus according to the present invention, in which 1 is an image reading section;
2 is an image processing section, 3 is an image recording section, 4 is a color patch,
5 is a comparison control unit, 6 is a first selector, 7 is color data, 8 is a second selector, 9 is a first gamma (γ) correction unit, 1
0 is a color correction section, and 1l is a second gamma (r) correction section.

In FIGS. 1 and 2, the image processing apparatus reads a document in an image reading section l and converts it into a digital image, and performs digital image processing in an image processing section 2.
The image recording section 3 outputs image data. Here, the input image data is image data output from the image reading section l.

The output image data is image data that is manually input to the image recording section 3. Furthermore, in FIG. 2, the portions surrounded by broken lines are blocks for the present invention.

The explanation will be divided into three parts: conventional mode, color patch mode, and two-color conversion mode.

1) Conventional mode The first selector 6 selects human image data, and the second selector 8 selects the first selector 6.

The input image data (R, G, B) is input to the first selector 6. Second
The signal is input to the first γ correction unit 9 via the selector 8 . Here, T correction for R, G, and B systems is performed. The data output from the 1T correction section 9 is manually inputted to the color correction section 10, and the data output from the R.T. From G, B series to C, M. Performs Y and Bk color correction. The data output from the color correction section 10 is
The T correction unit 1l manually performs γ correction that matches the characteristics of the image recording unit 3.

2) Color patch mode The first selector 6 selects the color patch 4, and the second selector 8 selects the first selector 6.

The output of the color patch 4 is input to the first γ correction section 9 via the first selector 6 and the second selector 8. After that, it is the same as the conventional mode.

Here, color patches will be explained. Here, a case where the density of the image recording section 3 is 16 mm/dot will be described.

FIG. 3 is a block diagram of the comparison control section in FIG.
The figure is a block diagram of the color patch generation circuit, Figure 5 is an explanatory diagram of the number of blocks generated for color expression, Figure 6 is an explanatory diagram of the amount of change in green (G), and Figure 7 is the 1st floor of G. It is an explanatory diagram of a change pattern during tuning. Figure 3. In Fig. 4, 12, 13, and 14 are comparators, l5 is a main counter, and l6
is a secondary counter, I7 is a ternary counter, 18 is a counter,
19 is a code-specific selector, and 20 is a color data selector.

In order to output color patch 4 using hardware, the area size is set to 8KX4K, R (red), G (green), . B (Blue) Expresses 512 colors in 8 gradations each. The number of generated blocks is 16×32 as shown in FIG. G
The amount of change in is as shown in FIG. The amount of change in R and G changes in a pattern as shown in FIG. 7 during one gradation of G. Also, between each color is a 32-dot line (frame).
is generated. The numbers in Figure 6.7 are 8-bit gradation Hex
(Hexadecimal notation). The circuit for generating the color patch 4 is shown in FIG.

i PCLK is a pixel clock, H5 to H12 correspond to the bits of the main counter, and H12 corresponds to 4K. L
SYNC is a line synchronization signal, and LAD5 is a sub counter I.
It represents 20H corresponding to bit 6, and counter 18 is L.
SYNC 1 9 Count up in 2 cycles, VO~
V5 corresponds to the bit of counter 18. VO is the LSB of the counter 18, and V5 corresponds to the number of lines, 6K.

When IDO is H, the code selector 19 selects [{8 to 1
0 is selected and passed to the color data selector 20.

Similarly, when rD1 is H, Hll, V3, and ■4 are selected, and when ID2<H (D), VO-V2 is selected. Depending on the selected data, data is output from the color data selector 20. be done.

In FIG. 4, IDO corresponds to R, IDI corresponds to G, and ID2 corresponds to B. Further, the numbers in the color data selector 20 are shown in 8-bit gradation Hex.

3) Color change mode The first selector 6 selects input image data.

The second selector 8 selects between the color data 7 and the first selector 6 (selecting human image data) using the comparison control unit 5. The portion outside the broken line portion is the same as the conventional mode. The comparison and selection section will be explained using FIG. 3 as an example. Image data is inputted into R, G, and B channels to R, G, and H comparators 12 and 13.14, respectively. Comparison data R, G, and B, to which arbitrary values have been set by the operator in advance, are also input to the respective comparators 12, 13, and 14.

Then, image data R, G, B and comparison data R, G.
Only when the respective values of B match, the output of the second selector 8 is selected as the color data 7. The number of bits compared at this time is variable, and it functions like a wint comparator.

FIG. 8 is a flowchart showing the operating procedure of the present invention.

Color Registration (S1) 1) In order to read the first converted color (extracted color), input position information of an arbitrary point in the document using a digitizer or the like.

2). 1) Perform pre-scanning based on the position information and store color data of an arbitrary point. At this time, no output is produced.

3). The data of the first γ correction 9 in FIG. 1 is converted based on the color data of 2). At this time, the center data is calculated within the system so that it becomes the color data of 2).

Color patch output (S2) After the pre-scan is completed, a color patch is output. At this time, since the data of the first γ correction 9 is outputted based on the color registered data in color registration S1, the color patch is outputted as an approximate color registered in color. As shown in FIG. 5, a code is specified for the color patch, and the registered color is displayed as 30-3 etc. according to the operation guidance.

Color parameter input (S3) While looking at the color patches, the operator selects a color to be converted from among the color patches. When inputting the color selected from among the color patches, input it using the code of the color patch. At this time, it is easier to compare the colors (extracted colors) that you want to convert, not the original, but the one you want to copy. Next, as the color after conversion (color data), you can select the color in the system section, or select R
．． You may enter the values of G, B or C, M, and Y.

Based on the above data, set the color data, comparison data, and the number of valid digits of the comparison data.

Copy Star} (S4) FIG. 9 is an explanatory diagram of color conversion.
) copy start will be explained based on FIG. By registering the color of the black part of the original ta+ as the extracted color (the color you want to convert) and registering the color data (color after conversion) of the shaded part in (1)), the original (
Color conversion can be performed from the color in a) to (11). In the figure, the shaded area indicates the converted color.

FIG. 10 is a block diagram showing another aspect of the present invention, and the difference from FIG. 1 is that the comparison control section in FIG. are given the same reference numerals and detailed explanations will be omitted. The selection means by the selector control section 21 may be a position specifying means or a specified density of the input image.

FIG. 11 is a flowchart of the embodiment of the invention shown in FIG. The operating procedure will be explained below using this flowchart.

1) Color patch output (S6) After determining the presence or absence of color patch output (S5), R.
Outputs 512 color data with 8 gradations each for G and B. If there is a color patch that was previously output, there is no need to output it.

2) Conversion area setting (S7) a) Method using position specifying means (painting) The area is set by manually inputting coordinate values around the part where the expected color is to be generated using a digitizer or numeric keypad.

b) Method based on the density range of the input image (color conversion) Select the color to be converted from among the color patches. At this time, it is better to compare the colors you want to convert using a copy of the original rather than the original. When registering color data selected from a color patch, you can either enter the coordinate values with a digitizer, or you can enter a code such as 32-10, which is specified for the color patch as shown in Figure 5. do not have. 3) Setting conversion color data (S8) Select the color data generated in the area specified in 2) from among the color patches. The selection method is performed using the square selected in 2)-b).

4) Copy start (S9) After completing the above settings, start copying.

Figure 12 is an explanatory diagram of the output results, and the fat in Figure 12 is 2.
)-a), and (b) in Fig. 12.
) is due to the density range of the input image in 2)-b).

In the figure, the shaded area is the converted color. By operating in this manner, any color within the color patch generated by the copying machine can be generated in a predetermined area and output.

In this embodiment, the color patch basically generates 512 colors, but when other colors are required, by changing the curve of the first γ correction 9 or the second T correction 11,
It can occur freely. B may be set only at high levels, G only at intermediate levels, and R only at low levels. Since the color patch generation section and the color data output are data of the same system (no level conversion is performed), no special calculation is required when setting the color data. When you need data other than the basic 512 colors,
Although it requires some calculation, it is not a big problem. Since it is a color patch that occurs inside the copying machine, it is also effective for investigating the internal state.

〔Effect of the invention〕

As explained above, according to the present invention, since the density range specified by the density specifying means is used as the extraction color for color conversion of color data in the position specifying means, when color conversion is performed, the color registered approximation By outputting data, you can ensure the color range you want to convert, check color registration, and output approximate data, so even if you make a mistake in setting the color range, you can easily change it. It is possible to provide an image processing device capable of

Further, according to the present invention, an arbitrary color is specified from among the color data of a color patch, and this color is generated in a predetermined area and output.For example, a color patch generated inside a copying machine is By selecting color data from among these, it is possible to provide an image processing device that can perform color conversion that always matches the expected color.

[Brief explanation of drawings]

FIG. 1 is a block diagram illustrating an embodiment of an image processing apparatus according to the present invention, FIG. 2 is a block diagram illustrating the basic configuration of the image processing apparatus according to the present invention, and FIG. 3 is a block diagram illustrating a comparison control section. Figure 4 is a circuit diagram showing the configuration of the color patch generation circuit, Figure 5 is an illustration of the number of blocks generated for color expression, Figure 6 is an illustration of the amount of change in green, and Figure 7 is an illustration of the amount of change in green. An explanatory diagram of a change pattern in one gradation, FIG. 8 is a flowchart showing the operating procedure of the image processing apparatus according to the present invention, FIG. 9 is an explanatory diagram of color conversion, and FIG. FIG. 11 is a flowchart showing the operating procedure of the mode shown in FIG. 10, and FIG. 12 is an explanatory diagram of the output results. 1... Image reading section, 2... Image processing section, 3...
Image recording section, 4... Color patch, 5... Comparison control section, 6... Ith selection, 7... Color data, 8
. . . second selector, 9 . . . 1st gamma (D) correction unit, 10 . , l5...Main counter, 16...Sub counter, 17.
... Ternary counter, l8... Counter, 19... Selector by code, 20... Color data selector, 21... Selector control unit. No.! Figure t Residence 27 Paintings 1 Softer Figure 2 Figure 3 Figure 6 Figure 8 Figure 2 8th Anniversary/Anne 91st//Figure 111111

Claims (2)

[Claims] (1) In an image processing device that converts multivalued color data into other color data, such as a digital color copying machine, a color image reading means, a color image recording means,
A position specifying means for specifying a substantially constant arbitrary point of color data, a storage means for storing color data of the point specified by the position specifying means, and a color patch centered on the color data stored by the storage means. a color patch generating means, a density range specifying means for selecting and specifying an arbitrary density range from the color patch generated by the color patch generating means, and a position specifying means for specifying the density range specified by the density range specifying means. An image processing apparatus comprising: means for extracting a color for color conversion of color data. (2) In an image processing device that converts multi-valued color data into other data, such as a digital color copying machine, a color patch output means that generates and outputs a color patch, and a color output by the color patch output means. It is characterized by comprising a color specifying means for specifying an arbitrary color from among the color data of the patch, and a specified color output means for generating and outputting the arbitrary color specified by the color specifying means in a predetermined area. image processing device.