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adaptive predictive coding algorithm aliasing aperture average binary image block code camera CCITT character codeword coding scheme components compression ratio continuous tone contours contrast curve density detail detection display dither dot profile edge edge detectors electronic elements encoding entropy error evaluation facsimile factor Figure film filtering Fourier frequency function Graphics gray level gray scale grey halftone halftone cell halftone image halftone screen histogram Huffman code IEEE IEEE Trans Image Processing imagery increase input kinescope legibility length lens linear measured method modified Huffman code noise noisy documents normal obtained one-dimensional operators optical output parameters pattern pels percent photographic pictorial picture pixel polyomino prediction quantization rendition reproduction resolution run-length coding sample scan line scanner shown in Fig signal spatial Table techniques television threshold tion tone scale transfer characteristic transmission transmitted trominoes two-dimensional values width