JP2610023B2 - Color image processing equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a color image processing apparatus having a color conversion function.

[Prior Art] Conventionally known color image processing apparatuses perform masking processing, UCR (under color removal) processing, color conversion processing, and the like.

[Problems to be Solved by the Invention] In recent years, in addition to color conversion in one screen, an apparatus that provides a plurality of regions in one screen and performs a color conversion process for each region has been considered.

However, among the above-described areas, for example, when the first area and the second area overlap, it is determined whether to perform the processing according to the first area or the processing according to the second area. There was a problem that it could not be decided.

As a solution to the above problem, processing is individually set with the overlapping area as a third area.

However, even when it is desired to perform the processing corresponding to the first area or the processing corresponding to the second area on the overlapping portion, in the configuration in which the processing is newly set as the third area, it is difficult to operate from the viewpoint of operation. It was not very convenient.

[Means for Solving the Problems] In order to solve the above problems, a color image processing apparatus according to the present invention includes: a generating unit configured to generate an area signal indicating a plurality of areas on an image; Processing means for performing a predetermined color conversion process, wherein a priority order is defined for the plurality of regions, and when the plurality of regions overlap, the priority order of the overlapping regions is determined. Control means for controlling the processing means so as to perform a color conversion process corresponding to an area having a high level.

〔Example〕

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

FIG. 1 is a block diagram showing one embodiment of the present invention. In the figure, a three-color separation signal read by the image input device 1 is sent to a first priority color determination circuit 2, a second priority color determination circuit 3, a third priority color determination circuit 4, and a fourth priority color determination circuit 5. Is entered. These first to fourth priority color determination circuits 2 to
At 5, the central processing unit (not shown) compares the color with the specific color set, and only the outputs J1 to J4 of the color determination circuit determined to be substantially the same are set to "1".

Outputs J1 to J4 of the first to fourth priority color judgment circuits 2 to 5
Are input to the selectors 6 to 9 as selection control signals, respectively. These selectors 6 to 9 select and output 1S1, 2S1, 3S1, and 4S1, respectively, when the selection control signal is "1". When the selection control signal is "0", the selectors 6 to 9 select and output 1S2, 2S2, 3S2, and 4S2, respectively. Where 1S1,2
S1, 3S1, and 4S1 are colors for color conversion of specific colors set in the first to fourth priority color determination circuits 2 to 5, and are set by a central processing unit (not shown). Also, 1S2,2S2,3S
2,4S2 is a color for masking an area other than a specific color in an area designated to perform color conversion, and is set by a central processing unit (not shown).

The outputs of the selectors 6, 7, 8, 9 are input to the selector 10.
The output is selected according to the output of the control unit 24. High-priority color conversion or high-priority color conversion in a high-priority area, and one of eight color mask values 1S1 to 4S2 are selected and output.

The output of the selector 10 is input to the selector 20, and is selectively output from the selector 20 when performing color conversion or color masking. The output of the selector 19 is input to the other input terminal of the selector 20. The selector 19 receives an input signal from the image input device 1 and a signal JS set by a central processing unit (not shown). As a selection control signal of the selector 19, an output signal of the AND gate 16 is used.

A signal MR set by a central processing unit (not shown) and an output signal of the inverter 18 are input to the AND gate 16. Here, JS is a set value representing a color for masking a color other than a plurality of designated regions (for color conversion). Further, the output “1” of the inverter 18 indicates that the output is outside of the plurality of designated areas. Further, MR is a signal (set by a central processing unit (not shown)) which becomes "1" when a color mask is applied to areas other than a plurality of designated areas.
Therefore, JS is output from the selector 19 only when color masking is performed on areas other than a plurality of areas.

The selector 20 selects and outputs the output of the selector 10 only when performing color conversion or color masking. At this time, NOR gate 1
The output of 7 is "1". Since the output of the inverter 18 is input to the NOR gate 17, the output of the selector 19 is selected in areas other than the designated area.

M1 to M4 shown in the figure are signals set by a central processing unit (not shown). Then, NAND outputs of M1 and J1, M2 and J2, M3 and J3, M4 and J4 are obtained from the NAND gates 12 to 15, respectively. These NAND outputs are input to the selector 11,
The signal with the highest priority is selected and output. The output of the selector 11 corresponds to the output of the selector 10. That is, when the outputs of the selectors 6, 7, 8, 9 are respectively selected in the selector 10, the outputs of the corresponding NAND gates 12, 13, 14, 15 are selected from the selector 11.

Therefore, when a color mask is not performed on a part that is not a specific color in the area, the corresponding signal among M1 to M4 is set to “0”. Then, “0” is output from the NOR gate 17, and the output of the selector 19 is selected by the selector 20. At this time,
The output of the selector 19 is the output of the image input device 1 itself.

The control unit 24 that controls the selector includes region signals R1 to R4
Is entered. These region signals R1 to R4 are “1” when representing a region to be color-converted, and “0” when representing a region other than that. Further, among the four area signals R1 to R4,
R1 has the highest priority, and the priorities are determined in the order of R2, R3, and R4.

Also, a signal MODE for designating an operation mode is set by a central processing unit (not shown) and is input to the control unit 24.

In this embodiment, by setting the mode designation signal MODE to "0", the color conversion of the first to fourth specific colors is performed in the region R1. On the other hand, when MODE = "1", only one color conversion of a specific color can be performed in each of the regions R1 to R4.
However, the specific color to be color-converted corresponds to the specific color of the color determination circuits 2 to 5.

When MODE = “1” is set, the area signals R1 to R4 are input to the priority decoder 23 via the selector 21 and the selector 22. Then, the selection control signal is output from the priority decoder in accordance with the signal having the highest priority among R1 to R4 showing “1”. That is, the corresponding outputs of the selectors 6 to 9 and the selectors 12 to 15 are sequentially selected from the selectors 10 and 11 according to the priority order in the area presenting “1”.

When MODE = "0" is set, the selector 21 always selects and outputs R1, and the selector 22 selects and outputs J1 to J4. Then, the selection control signal is output from the priority order decoder 23 in accordance with the color conversion of the specific color having the higher order of priority. J1 mentioned above
The corresponding outputs of the selectors 6 to 9 and the NAND gates 12 to 15 are selected and output from the selector 10 and the selector 11 in order according to the priority order among those presenting “1” among the signals J1 to J4.

The output of the selector 21 is also introduced into the OR gate 25, and a 4-bit OR output is obtained. As a result, a signal indicating one of the regions is obtained from the OR gate 25.

By the way, when MODE = “0” is set, the first to fourth color conversions are performed only in the region of R1, but when the outputs of the first to fourth priority color judgment circuits 2 to 5 are all zero. (Ie 4
In the case where the color does not correspond to any specific color), data “0” is all input to the priority order decoder 23. Then
The selectors 10 and 11 select the output of the selector 9 and the NAND gate 15, and 4S2 and M4 are set as color masks other than the specific color in the area. In other words, 4 S2, M 4 which is the lowest priority (4 in this case) in the same area (R1 in this case) is set. MODE
When "1", color conversion is possible up to one color per area. Therefore, by setting 1S2-4S2 and M1-M4 in each area corresponding to R1-R4, a color other than a specific color in the area is set. Can be color masked.

As another embodiment of the present invention, the first to fourth priority color judgment circuits are extended to the first to Nth, and the area signals R1 to R4 are changed to R1 to RM.
(N and M are integers). However, in this case, N selectors 6 to 9 and NAND gates 12 to 15 are required respectively.

In this case, the control unit 24 may be provided with a look-up table or the like, and the outputs corresponding to the inputs R1 to RM and the MODE input of several bits may be written. This results in the region signal R
The specific color conversion performed in each area corresponding to 1, R2, R3, R4... RM can be performed corresponding to several specific colors set in the first to Nth priority color determination circuits. is there.

In this case, in the region having the highest priority among R1 to RM in which the region signal is “1”, the selectors 10 and 11 select the highest priority one of several color conversions performed in this region. Just create a look-up table to make your selection. At this time, when there is no color conversion to be performed in the area, that is, when there is no corresponding specific color, the color conversion and the color mask color having the lowest priority among several color conversions performed in the area are determined. The selector 10 may be controlled to select the set selector output (that is, one of the N expanded selectors 6 to 9), and the same operation may be performed on the selector 11. When a color mask other than several specific colors is to be masked in the area, the color to be masked is set to the lowest priority color mask color in the area. And the corresponding M the M1~M4 extended to N to _X a (X integer) "1"
Set to.

〔The invention's effect〕

As described above, according to the present invention, when a plurality of areas are overlapped, the color conversion processing corresponding to a high priority area among the overlapping areas is configured to be performed. The color conversion processing according to the priority order can be automatically performed on the overlapped area as compared with the case where the user sets the color conversion processing individually by using the area of the overlapped area as one area. As a result, it is possible to obtain an effect that the trouble of the setting by the user himself can be saved.

[Brief description of the drawings]

 FIG. 1 is a block diagram showing one embodiment of the present invention. 1 ... image input device, 2-4 ... 1st-4th priority color judgment circuit, 6-9 ... 2to1 selector, 10, 11 ... 4to1 selector, 12-15 ... NOR gate, 16 ... AND Gate, 17 AND gate, 18 inverter, 19, 20 2 to 1 selector, 21, 22 2 to 1 selector, 23 priority decoder, 24 control unit, 25 inputs and 1 output OR gate.

Claims (1)

(57) [Claims] 1. A color image processing apparatus comprising: a generation unit that generates region signals indicating a plurality of regions on an image; and a processing unit that performs a color conversion process determined for each of the regions. A priority is defined for the region, and when the plurality of regions overlap, the control unit controls the processing unit to perform a color conversion process corresponding to a region with a high priority of the overlapping region. Characteristic color image processing device.