JPH10290376A - Image processor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image processor capable of reducing its circuit scale for applying filter processing to received color image data is reduced. SOLUTION: Data of a black component of R, G, B image data received by a black component arithmetic unit 1 are extracted and outputted to a filter 3. The filter 3 applies filter processing to the data of the black component outputted from the black component arithmetic unit 1 and the result is outputted to adders 5, 7 and 9. The adders 5, 7, 9 add the data of the black component subject to filter processing by the filter 3 to the received R, G, B image data to provide an output of the R, G, B image data after the processing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image processing apparatus, and more particularly, to R image data and G image data as color multivalued image data.
The present invention relates to an image processing apparatus capable of inputting three image data of image data and B image data.

[0002]

2. Description of the Related Art At present, image data of a read image is represented by R
A color copier, a color scanner, a color printer, etc., which processes as color image data represented by image data (red component image data), G image data (green component image data), and B image data (blue component image data) Is widely used in various fields. Along with that, a technique for processing image data for each color constituting color image data is also an essential technique to be provided in the above-described image processing apparatus.

Various methods have been proposed for processing image data in such an image processing apparatus. For example, in “Method and apparatus for improving contour reproduction by signal filtering” disclosed in Japanese Patent No. 2541738,
It is stated that a signal processing (contour correction processing) of a signal having a slight SN ratio with high quality is performed to improve the image quality of the obtained color image.

[0004]

However, in the above-described conventional image processing apparatus, the image quality can be improved by processing the color image data. However, the input R image data, G image data, and B image data can be improved. Processing such as a filter is individually performed on image data for each color of data.

[0005] Therefore, since a processing circuit must be provided for each image data corresponding to each color, there is a problem that the scale of the apparatus is increased when the processing is simply performed or when the processing is complicated. have.

The present invention has been made in view of the above circumstances,
It is an object of the present invention to provide an image processing apparatus capable of reducing the scale of an image processing apparatus that performs processing on color image data.

[0007]

According to the first aspect of the present invention,
A first extraction unit that extracts and outputs common component data common to each of the input R image data, G image data, and B image data; and a common component data output from the first extraction unit. A first filter that performs a filtering process, and data of a common component that has been subjected to the filtering process by the first filter, the input R image data;
A first adding means for adding to the G image data and the B image data.

Therefore, according to the present invention, common component data of R image data, G image data and B image data as input color image data is extracted, and the extracted data is subjected to a filtering process. After that, the data of the common component subjected to the filtering process and the input image data of each color are added, so that the device scale of the image processing device is compared with the case where the individual filtering process is performed on each image data. Can be reduced.

The invention according to claim 2 is the invention according to claim 1, wherein the data of the common component is data of a black component.

Therefore, according to the present invention, the operation of the invention described in claim 1 can be obtained, and since the data of the common component to be extracted is the data of the black component, the data can be easily extracted. In addition to this, it is possible to prevent a decrease in saturation when performing the enhancement processing.

According to a third aspect of the present invention, there is provided a selecting means for selecting any two image data from the input R image data, G image data and B image data and outputting the selected image data as selected image data; A second extraction unit that extracts and outputs data of a common component of the selected image data output from the second unit, a second filter that performs a filtering process on the data of the common component output from the second extraction unit, A second adding unit that adds the data of the common component that has been subjected to the filtering process by the second filter to the selected image data selected by the selecting unit.

Therefore, according to the present invention, there is provided a case where filter processing is performed on any two image data of R image data, G image data and B image data as input color multivalued image data. Also selects any two image data, extracts data of a common component of the two image data, and performs a filtering process on the extracted data. It is possible to reduce the size of the image processing apparatus as compared with the case where individual filtering is performed on the image data.

According to a fourth aspect of the present invention, in the third aspect of the present invention, the common component data is black component data.

Therefore, according to the present invention, the effect of the invention described in claim 3 can be obtained, and since the data of the common component to be extracted is the data of the black component, the data can be easily extracted. In addition to this, it is possible to prevent a decrease in saturation when performing the enhancement processing.

[0015]

Next, an embodiment of an image processing apparatus according to the present invention will be described with reference to the drawings. FIG.
FIG. 1 shows a block diagram of a first embodiment of an image processing apparatus according to the present invention.

As shown in FIG. 1, the image processing apparatus according to the first embodiment includes a black component calculator for extracting black component data contained in input R image data, G image data and B image data. 1, a filter 3 for performing a filtering process on the black component data outputted from the black component computing unit 1, a filtered black component data outputted from the filter 3, and the inputted R image data, G image data, R image data after adding and filtering the B image data,
It comprises adders 5, 7 and 9 for outputting G image data and B image data.

Next, the operation of the image processing apparatus according to the first embodiment shown in FIG. 1 will be described. First, R image data, G image data, and B image data output from an external device and input to the image processing apparatus according to the present embodiment are input to the black component calculator 1 and the adders 5, 7, and 9, respectively.

The black component calculator 1 extracts black component data as common image data from the data contained in the input R image data, G image data and B image data, and outputs the same to the filter 3.

The filter 3 performs a filtering process on the black component data as the common image data output from the black component calculator 1, and applies the filtered black component data to the adders 5, 7, and 9, respectively. Output to Here, the filter 3 may be a low-pass filter, a band-pass filter, or the like.

The adders 5, 7, and 9 add the input R image data, G image data, and B image data to the filtered black component data output from the filter 3, and perform the filter processing. Are output as R image data, G image data, and B image data.

Therefore, according to this embodiment, black component data is output as common image data included in R image data, G image data, and B image data output from an external device and input to the image processing apparatus according to this embodiment. The filter 3 performs a filtering process on the extracted black component image data, and adds the filtered R component data, G image data, and B image data to the added black component image data and an adder 5. , 7 and 9 are added and output as filtered R image data, G image data and B image data, so that the R image data, G image data and B image data are individually filtered. Can be reduced in size as compared with a conventional image processing apparatus that performs the above.

In the first embodiment described above, the black component data is extracted by the black component calculator 1 as the image data of the common component of the input R image data, G image data, and B image data. The data to be extracted is not limited to black component data. However, by performing the filtering process on the image data of the black component, it is possible to prevent a decrease in saturation when performing the enhancement process.

For example, image data commonly included in the input R image data, G image data, and B image data may be arbitrarily selected, and the selected image data may be used as common component image data. Even in this case, the circuit scale of the image processing apparatus can be reduced as in the first embodiment, as compared with the apparatus that performs the filtering process on the image data for each color.

Next, a second embodiment of the image processing apparatus according to the present invention will be described with reference to the drawings. FIG. 2 is a block diagram showing a second embodiment of the image processing apparatus according to the present invention.

As shown in FIG. 2, the image processing apparatus selects any two image data from the input R image data, G image data and B image data based on a selection signal O. The image data selectors 11, 13 and 15 output to the black component calculator 17, and the black component data is extracted as common image data included in the image data output from the image data selectors 11, 13 and 15, and a filter 19 Black component calculator 17 and black component calculator 1
7 performs a filter process on the black component data output from the filter 7, and outputs the processed black component data to the processed data selectors 21, 23 and 25 based on the selection signal O. Select and adder 2
Processing data selectors 21 and 2 for outputting to
3 and 25, and the black component data after processing output from the processing data selectors 21, 23 and 25, and the adders 27, 29 and 31 for adding the input R image data, G image data and B image data. It is composed of

Next, the operation of the image processing apparatus shown in FIG. 2 will be described. First, R image data, G image data, and B image data output from an external device and input to the image processing apparatus according to the present embodiment are output from the image data selector 11,
13 and 15 and input to adders 27, 29 and 31.

Image data selectors 11, 13 and 15 which input R image data, G image data and B image data
Selects any two image data from the R image data, the G image data, and the B image data based on the selection signal O, and outputs the selected image data to the black component calculator 17. Here, the image data selectors 11, 13 and 15 shown in FIG. 2 are in an independent form for each color, but the present invention is not limited to such an image data selector, Any selector may be used as long as it can select any two image data from the R image data, G image data, and B image data based on the selection signal O.

A black component calculator 1 to which two image data of the R image data, G image data and B image data selected by the image data selectors 11, 13 and 15 are inputted.
7 extracts black component data as image data common to the two image data and outputs the same to the filter 19.

The filter 19 to which the black component data is input from the black component calculator 17 performs a filtering process on the input black component data, and outputs the processed data selectors 21 and 23 as black component data after the filtering process. 25. Here, the filter 19 may be a low-pass filter, a band-pass filter, or the like.

Based on the selection signal O, the processed data selectors 21, 23 and 25, which have input the black component data after the filter processing, select any two of the adders 27, 29 and 31. And outputs the black component data after the filter processing. Here, the selected adder 27, 2
In 9 and 31, adders to which any two of the input R image data, G image data and B image data selected by the image data selectors 11, 13 and 15 are input are selected.

The adders 27, 29, and 31, which have input the black component data after the filtering process, input the black component data after the filtering process and the input R image data, G image data, The image data is added to the B image data and output as R image data, G image data, and B image data after the filtering process. The adders 27, 29, and 31, which have not input the black component data after performing the filter processing, output the input R image data, G image data, and B image data as they are.

Therefore, according to this embodiment, the R image data, the G image data and the B image data which are output from the external device and input to the image processing apparatus according to the present embodiment are selected based on the selection signal O. Black component data is extracted as common image data included in any one of the two image data, and a filter 1 is applied to the extracted black component image data.
9 performs filter processing, and the adder 27, 29, and 31 add the filtered black component image data to the input R image data, G image data, and B image data, and perform filter processing. Output as R image data, G image data, and B image data, even if the filtering process is performed on data of a specific color, any one of the R image data, G image data, and B image data The apparatus scale can be reduced as compared with a conventional image processing apparatus that individually performs filter processing on each of the two. In addition, since the filter processing is performed on the image data of the black component, it is possible to prevent a decrease in saturation when performing the enhancement processing.

In the above-described second embodiment, the black component data is extracted by the black component calculator 17 as the image data of the common component of the input R image data, G image data and B image data. The data to be extracted is not limited to the black component data. The image data commonly included in the input R image data, G image data, and B image data is arbitrarily selected, and the selected image data is converted to a common component. It may be image data. Even in this case, the circuit scale of the device can be reduced as in the above-described second embodiment.

[0034]

As is apparent from the above description, according to the present invention, the input R image data, G image data and B image data
The common image data included in the image data is extracted, the extracted image data is filtered, and the filtered image data is added to the input R image data, G image data, and B image data. Since the image data is output as filtered image data, the color image data is processed as compared with an image processing apparatus that individually processes the image data for each color of the input image data. In this case, it is possible to provide an image processing device capable of reducing the circuit scale of the image processing device.

Further, any two of the input R image data, G image data and B image data are selected, common image data of the selected two image data is extracted, and the extracted common image data is extracted. The filter processing is performed on the data, and the filtered common image data and any two image data are added and output as R image data, G image data, and B image data after the filter processing. It is possible to provide an image processing apparatus that can reduce the scale of an image processing apparatus as compared to an image processing apparatus that performs individual processing even when performing filter processing.

Further, since the black component image data is extracted as the common image data, it is possible to easily extract the common image data and to prevent a decrease in the saturation when performing the enhancement processing. An apparatus can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a structure of a first embodiment of an image processing apparatus according to the present invention.

FIG. 2 is a block diagram showing the structure of an image processing apparatus according to a second embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 black component calculator 3 filter 5, 7, 9 adder 11, 13, 15 image data selector 17 black component calculator 19 filter 21, 23, 25 processing data selector 27, 29, 31 adder

Claims (4)

[Claims] A first extraction unit that extracts and outputs common component data common to each of the input R image data, G image data, and B image data; and a first extraction unit that outputs the data. A first filter that performs a filtering process on the data of the common component; and data of the common component that has been subjected to the filtering process by the first filter are added to the input R image data, G image data, and B image data. An image processing apparatus comprising: a first adding unit. 2. The image processing apparatus according to claim 1, wherein the data of the common component is data of a black component. 3. Selection means for selecting any two image data from the input R image data, G image data and B image data and outputting the selected image data as selected image data, and a selected image output from the selection means A second extraction unit that extracts and outputs data of a common component of data, a second filter that performs a filtering process on data of the common component output from the second extraction unit, and a second filter. An image processing apparatus comprising: a second adding unit that adds the data of the common component subjected to the filter processing to the selected image data selected by the selecting unit. 4. The image processing apparatus according to claim 3, wherein the data of the common component is data of a black component.