Image processing apparatus using two-dimensional space frequency to discriminate image type
First Claim
Patent Images
1. An image processing apparatus comprising:
- image data input means; and
means for processing image data entered by said input means,wherein said processing means includes means for binarizing the image data inputted from said input means to produce binary data and means for discriminating image tone by examining characteristics of two-dimensional space frequency relating to the inputted image data by discriminating continuity of the adjacent binary data binarized by said binarizing means.
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Abstract
A image processing apparatus capable of faithfully reproducing half tone image, line image and dot image by distinguishing the nature of the original image. The image is discriminated by the distribution of its spatial frequency.
64 Citations
28 Claims
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1. An image processing apparatus comprising:
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image data input means; and means for processing image data entered by said input means, wherein said processing means includes means for binarizing the image data inputted from said input means to produce binary data and means for discriminating image tone by examining characteristics of two-dimensional space frequency relating to the inputted image data by discriminating continuity of the adjacent binary data binarized by said binarizing means. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An image processing apparatus, comprising:
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image data input means; and means for processing image data entered by said input means, wherein said processing means includes means for binarizing the image data inputted from said input means to produce binary data and means for discriminating image tone by examining characteristics of two-dimensional space frequency relating to the inputted image data on the basis of the binary data, wherein said discriminating means is adapted to divide the entered image data into plural blocks and to discriminate a nature of image of each block, each of the blocks having plural image data, and wherein, for each of the blocks, said binarizing means is adapted to binarize each image data in the block to obtain the binary data and said discriminating means is adapted to obtain a number of transitions of said binary data, thereby discriminating the nature of image for each block according to the number of transitions.
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8. An image processing apparatus, comprising:
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image data input means; and means for processing image data entered by said input means, wherein said processing means includes means for binarizing the image data inputted from said input means to produce binary data and means for discriminating image tone by examining characteristics of two dimensional space frequency relating to the inputted image data on the basis of the binary data, and wherein said discriminating means is adapted to obtain a number of transitions of the binary data and discriminate image tone in accordance with the number of transitions. - View Dependent Claims (9)
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10. An image processing apparatus comprising:
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image data input means; and means for processing image data entered by said input means, wherein said processing means includes means for binarizing the image data inputted from said input means to produce binary data and means for discriminating image tone by examining characteristics of two-dimensional space frequency relating to the inputted image data, wherein said discriminating means is adapted to divide the entered image data into plural blocks and to discriminate a nature of image of each block, each of the blocks having plural image data, wherein said processing means includes means for smoothing each said image data in said block and reproducing a dot image by half-tone processing the smoothed image data, said smoothing/reproducing means being selected in accordance with a result of discrimination performed by said discrimination means, and wherein said reproducing means comprises dither process means for applying a dither process to each smoothed image data in said block.
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11. An image processing apparatus comprising:
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pixel data input means; and means for processing pixel data entered by said input means; said processing means including means for dividing said entered pixel data into plural blocks and discriminating a nature of image for each block, each said block having a plurality of pixel data; and said dividing/discriminating means providing a sum of differences in density of pixel data adjacent to each other and discriminating image tonality on the basis of the sum. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. An image processing apparatus comprising:
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image data input means; and means for processing image data entered by said input means, wherein said processing means includes means for binarizing the image data inputted from said input means to produce binary data and means for discriminating image tone by examining characteristics of two-dimensional space frequency relating to the inputted image data by discriminating continuity of the adjacent binary data, wherein said discriminating means is adapted to divide the entered image data into plural blocks and to discriminate a nature of image of each block, each of the blocks having plural image data, wherein said processing means includes means for smoothing each said image data in said block and reproducing a dot image by half-tone processing the smoothed image data, said smoothing/reproducing means being selected in accordance with a result of discrimination performed by said discrimination means, and wherein said reproducing means comprises dither process means for applying a dither process to each smoothed image data in said block.
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19. An image processing apparatus comprising:
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image data input means; and means for processing image data entered by said input means, wherein said processing means includes means for binarizing the image data entered from said input means to produce binary data and means for discriminating image tone of the entered image data on the basis of the binary data, and wherein said processing means further comprises selecting means for selecting the binary data produced by said binarizing means as reproduction data for image reproduction in accordance with a result of discrimination performed by said discriminating means. - View Dependent Claims (20, 21, 22)
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23. An image processing apparatus comprising:
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image data input means; and means for processing image data entered by said input means, wherein said processing means includes means for binarizing the image data inputted from said input means to produce binary data and means for discriminating image tone by examining characteristics of two-dimensional space frequency relating to the inputted image data by discriminating continuity of the adjacent binary data, wherein said discriminating means is adapted to divide the entered image data into plural blocks and to discriminate a nature of image of each block, each of the blocks having plural image data, wherein for each of the blocks, said binarizing means is adapted to binarize each image data in the block to obtain the binary data and said discriminating means is adapted to obtain a number of transitions of said binary data to distinguish the continuity, thereby discriminating the nature of image of each block according to the number of transitions.
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24. An image processing apparatus comprising:
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image data input means; and means for processing image data entered by said input means, wherein said processing means includes means for discriminating the image tone of the image data inputted by said input means, said discriminating means discriminating image tone of the image data by examining the characteristics of two-dimensional space frequency relating to the inputted image data by discriminating the continuity of the image data in a two-dimensional block, the two-dimensional block comprising a plurality of image data in the row and column directions thereof. - View Dependent Claims (25, 26, 27, 28)
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Specification