Patent ID: 11972594
Assignee: SHARP KABUSHIKI KAISHA
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G  H | IPC G

Claim 10:
11. An image processing method comprising:
deriving a color distribution degree that is a distribution degree of pixel values of respective sets of pixel data included in input image data;
deriving a photograph area ratio that is a ratio of photograph area pixel data forming a photograph area to the pixel data;
deriving a color uniformity area ratio that is a ratio of color uniformity area pixel data forming a color uniformity area where the pixel values are defined as being uniform to the pixel data; and
determining whether to perform either an index color process to perform a compression process using a lossless compression method after performing a color reduction process on the input image data or a full-color process to perform a compression process using a lossy compression method without performing the color reduction process on the input image data based on the color distribution degree, the photograph area ratio, and the color uniformity area ratio, wherein
the method further comprises determining to perform the index color process only when the color distribution degree is less than a first reference value, the photograph area ratio is less than a second reference value, and the color uniformity area ratio is more than a third reference value.