Image processing apparatus
First Claim
Patent Images
1. An image processing apparatus comprising:
- means for inputting pixel data; and
means for processing the pixel data inputted by means of said input means,wherein said processing means has means for discriminating an image tone of the pixel data for each pixel, and said discriminating means discriminates both spatial frequency characteristics of pixel data of interest and a linearity of the pixel data of interest with respect to adjacent pixel data thereto, in connection with a plurality of directions, on the basis of the pixel data of interest and the adjacent pixel data, and discriminates the image tone of the pixel data of interest.
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Abstract
An image processing apparatus has an image reading unit, a two dimensional smoothing circuit, a dither processing circuit, a binarizing circuit, a discriminator, a switch and a printer. A moire suppressed binary signal from the dither processing circuit is supplied to the printer via the switch when the discriminator discriminates a pixel of interest as a dot region. However, when the discriminator discriminates the pixel of interest as a line image region, a binary signal from the binarizing circuit is supplied to the printer via the switch.
36 Citations
24 Claims
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1. An image processing apparatus comprising:
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means for inputting pixel data; and means for processing the pixel data inputted by means of said input means, wherein said processing means has means for discriminating an image tone of the pixel data for each pixel, and said discriminating means discriminates both spatial frequency characteristics of pixel data of interest and a linearity of the pixel data of interest with respect to adjacent pixel data thereto, in connection with a plurality of directions, on the basis of the pixel data of interest and the adjacent pixel data, and discriminates the image tone of the pixel data of interest. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 17, 19, 21, 23)
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9. An image processing apparatus comprising:
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means for inputting pixel data; and
means for processing the pixel data inputted by said means of said input means,wherein said processing means has means for discriminating an image tone of the pixel data for each pixel, and said discriminating means discriminates both spatial frequency characteristics of pixel data of interest and independence of the pixel data of interest with respect to adjacent pixel data thereto, in connection with a plurality of directions, on the basis of the pixel data of interest and the adjacent pixel data, and discriminates the image tone of the pixel data of interest. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 18, 20, 22, 24)
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Specification