An image processing device and method decodes encoded image data, and converts a resolution of the decoded image data. The encoded image data is formed by encoding image data partitioned into blocks, each block including a plurality of pixels aligned in a matrix shape. The image processing device includes a decoding section that decodes and cuts out a portion of the decoded image data corresponding to a preset cut-out area and outputs the portion of the decoded image data on a block-by-block basis, a block buffer section that temporarily stores the portion of the decoded image data output, a horizontal resolution conversion section that converts the resolution of the decoded image data in the horizontal direction, a line buffer section that temporarily stores the horizontal-resolution-converted image data, and a vertical resolution conversion section that converts the resolution of the horizontal-resolution-converted image data in the vertical direction.