US Patent 7443428 Image processing device

An image is divided into first and second images, whose pixel data are processed using different processors simultaneously. The pixel data of the first and second image is stored in a first memory field and a second memory field including top and lower fields. The processed data produced from the pixel data of the first image (the first processed data) is stored in the first memory field. The processed data produced from the top line of the second image (the partial processed data) is temporarily stored in a temporary memory field. The processed data produced from the other lines of the second image except for the top line (the second processed data) is stored in the lower field. The partial processed data which is temporarily stored in a temporary memory field is stored in the upper field after the second image processed data has finished being stored.