Patent ID: 11893288
Assignee: CANON KABUSHIKI KAISHA
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G  H | IPC G

Claim 14:
15. The image processing apparatus according to claim 12, wherein
a third initial pattern that is a dot pattern corresponding to a third grayscale value lower than the second grayscale value is further generated in the dot pattern generating step,
in the threshold setting step, the extracting step, the calculating step, the threshold setting step, the updating step, and the changing step are started from a point where the setting target threshold Th is a value corresponding to the first grayscale value, and are repeated until the setting target threshold Th is determined to be a value corresponding to a predetermined grayscale value between the first grayscale value and the second grayscale value, and
for each of the setting target thresholds Th lower than the second grayscale value, the extracting step, the calculating step, the threshold selecting-setting step, the updating step, and the changing step are repeated with the first initial pattern updated in the updating step set as a new first initial pattern and the third initial pattern set as a new second initial pattern.