Image signal processor and imaging system including the same

An image signal processor comprising:

• a buffer circuit configured to receive image data in a first orientation direction in which the image data was raster scanned;
• a frame memory component configured to receive from the buffer circuit and store the image data in the first orientation direction;
• an image signal processor configured to read the image data in the first orientation direction through the buffer circuit, change the orientation direction of the image data to a second orientation direction different from the first orientation direction, change the processed image data back to the first orientation direction, and output the processed image data in the first orientation direction through the buffer circuit.