Image processing method and image processing device
First Claim
1. An image processing method comprising the steps of:
- decoding an image by decomposing the image into multiple color components;
drawing a histogram by calculating the density value frequencies of the image data on the respective color components which have been obtained as a result of decoding;
calculating a high-density-side peak value and a low-density-side peak value from said histogram for judging their hierarchical relationship with regard to each of the respective color components;
counting the number of colors selected from among said multiple color components whose high-density-side peak values are higher than their low-density-side peak values; and
determining an image which is to become a binarization object based on the number of color components counted.
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Abstract
The present invention concerns an image processing device and an image processing method for processing a decoded image, and its objective is to optimally binarize a decoded original. After the respective density histograms of colors R, G, and B have been drawn, the hierarchical relationship between the low-density-side peak value and high-density-side peak value is investigated. A color component which is to become a binarization object is determined based on the comparison results on the number of color components whose high-density-side peak value is/are higher and the number of color components whose low-density-side peak value is/are higher, and the color of the pixel to be outputted is determined based on the comparison of the pixel with a threshold value.
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Citations
7 Claims
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1. An image processing method comprising the steps of:
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decoding an image by decomposing the image into multiple color components;
drawing a histogram by calculating the density value frequencies of the image data on the respective color components which have been obtained as a result of decoding;
calculating a high-density-side peak value and a low-density-side peak value from said histogram for judging their hierarchical relationship with regard to each of the respective color components;
counting the number of colors selected from among said multiple color components whose high-density-side peak values are higher than their low-density-side peak values; and
determining an image which is to become a binarization object based on the number of color components counted. - View Dependent Claims (2, 3, 4)
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5. An image processing device comprising:
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in an image processing device which processes image data which have been decoded after having been decomposed into multiple color components;
a histogram generation mechanism which generates a density value histogram with regard to each color component by tabulating inputted pixels in density value-specific fashions;
a peak detection mechanism which detects a low-density-side peak value and a high-density peak-side value on said density histogram;
a color component selection unit which compares the hierarchical relationship between said detected low-density-side peak value and high-density peak-side value with regard to each color component and which executes a binarization routine based on the comparison results; and
a binarization unit which binarizes the color component image which has been selected by said color component selection unit. - View Dependent Claims (6, 7)
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Specification