Patent ID: 11924390
Assignee: CANON KABUSHIKI KAISHA
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 4:
5. The apparatus according to claim 1, wherein the controller further changes the pixel value of the edge pixel to the pixel value of the color of the pixel having the highest brightness among pixels excluding the edge pixel from 5×5 pixels arranged around the edge pixel in the case where the brightness of the edge pixel indicating the edge portion in the image based on the image data with the color quantized is equal to or higher than the threshold value, and changes the pixel value of the edge pixel to the pixel value of the color of the pixel having the lowest brightness among the pixels excluding the edge pixel from the 5×5 pixels arranged around the edge pixel in the case where the brightness of the edge pixel is lower than the threshold value.