According to one embodiment, an image processing system includes an image processing device, an encoder, and a memory. The image processing device is configured to select one of a plurality of resolution candidates as a unified resolution, and to scale, according to the unified resolution, a first input image and a second input image to generate a first output image and a second output image, respectively. The first input image has a first resolution, the second input image has a second resolution different from the first resolution, and a resolution of the first output image is identical to a resolution of the second output image. The encoder is configured to encode the first output image and the second output image to generated encoded data. The memory is configured to store the encoded data.