Patent ID: 6134355
Filing Date: 2000-10-17
Classification: H04N

Abstract:
An image processing apparatus, which converts a signal representing multi-level data into a signal representing binary data, comprising:input means for scanning an original image and producing and inputting the signal representing the multi-level data of a target pixel;calculating means for obtaining an average density value of a predetermined region;binarizing means for binarizing the multi-level data of the target pixel on the basis of the average density value obtained by the calculating means, to produce the signal representing the binary data;correcting means for correcting for a difference which occurs when binarization is executed by said binarizing means, said difference being a difference between the input data and the average density value, wherein the correcting that is performed by said correcting means includes adding the difference between the input data and average density value to as-yet-unbinarized input data; andoutputting means for outputting the signal representing binary data produced by said binarizing means,wherein said calculating means receives, as an input, binary data representing a plurality of previous pixels from said binarizing means and calculates the average density value from the received binary data within the predetermined region.