A speech converter in a speech processing system modifies various aspects of input speech. For normal image generation, image signals are stored into and read from a memory after image correction. And the mirror block is arranged to receive a scanning signal from the scanner and to reflect the scanning signal into a plurality of directions to create multiple scanning planes. The second specific pattern is located along one or more of first borders along which the first specific pattern is located, the first borders being part of the borders of the rectangular region.