Patent ID: 11935314
Assignee: CANON KABUSHIKI KAISHA
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 11:
12. The apparatus according to claim 2,
wherein the first binary image is generated, from the input image, by converting the first pixel having the specific color into black pixel and by converting other pixels than the first pixels into white pixels,
wherein the at least one processor further performs:
generating, from the input image, a third binary image by converting a pixel having brightness darker than a predetermined brightness into black and by converting a pixel having brightness lighter than the predetermined brightness into white;
generating, from the third binary image, a fourth binary image by converting, into a white pixel, a black pixel of the third binary image, the black pixel in the third binary image corresponding to the first pixel having the specific color in the input image,
wherein the number of second pixels having the predetermined color in the candidate area is counted by counting a number of black pixels in the candidate area in the fourth binary image.