Threshold matrix and method of generating a threshold matrix

摘要

A threshold matrix for converting a continuous-tone image into a dot pattern representing a binary image is generated. When the continuous-tone image whose pixel values correspond to a dot percentage of 50% is converted into a dot pattern by the threshold matrix, a graph is obtained by conversion from the dot pattern into frequency-domain data. Then, the intensity of the dot pattern at angles (¸) corresponding to at least a main scanning direction is weakened, so that a periphery length of the dot pattern in the main scanning direction (MS) can be short.