Image processing device and image processing method for obtaining two sub-images from original image

An image processing method of processing image data, executed by an image processing device including a memory and a processor, the method comprising:

• separating first image data obtained by an image sensor having a Bayer arrangement, into second image data that includes brightness information, and third image data that includes color information and has a lower resolution than the first image data and the second image data,
• wherein a pixel arrangement of the third image data includes two pixels in each of a horizontal direction and a vertical direction, among which two pixels on one diagonal are of a same type, two pixels on another diagonal are of types different from each other, and the two pixels on said another diagonal are of the types different from the two pixels on the one diagonal.