| 摘要 |
False contouring of a screened halftone image without including more sub-elements in each cell, increasing the size of each cell, or decreasing the screen frequency of the image is accomplished by assigning to each sequential sub-element of a halftone cell a weighted probability of being "ON" in accordance with the value of the associated input signal. The weighted probability signal is converted to a binary value without a real time random number generator by a memory device having a plurality of rows, wherein each row represents a different probability that a sub-element will be "ON". The rows are accessed on the basis of the weighted probability of a sub-element being "ON".
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