Method of and apparatus for processing image data

H - Electricity – 04 – N

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H04N 5/262 (2006.01) H04N 1/40 (2006.01) H04N 1/401 (2006.01) H04N 5/30 (2006.01)

Patent

CA 2131446

- 32 - ABSTRACT OF THE DISCLOSURE A method of and an apparatus for processing image data in which first image data representing an image including a plurality of first pixels in a first density is converted into second image data representing the image by a plurality of second pixels in a second density which is a multiplication of the first density by a selected magnification factor are arranged such that a ratio of a size of a portion of each of the first pixels overlapping with each of the second pixels is determined based on the selected magnification factor and pixel signals representing the overlapping first pixels and weighted by weight coefficients determined by the corresponding ratios are averaged, thereby obtaining a pixel signal representing the second pixel. Moreover, if desired, a predetermined correction processing is applied to the first image data prior to the conversion of the first image data into the second image data. In the correction processing, a correction constant for the predetermined correction processing is determined for each of the pixel signals of the first image data, the pixel signal is subdivided into a plurality of bit blocks, each of the bit blocks including a predetermined number of bits, a predetermined operation processing is applied to a number represented by each of the plural bit blocks of the pixel signal and the correction constant determined for the pixel signal thereby to attain corrected partial data and the corrected partial - 33 - data obtained for the plural bit blocks of the pixel signal, respectively, are composed thereby obtaining a corrected pixel signal.

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