Patent ID: 6118547
Filing Date: 2000-09-12
Classification: H04N

Abstract:
An image processing apparatus for processing a multivalued image signal, comprising:first halftone processing means for applying pseudo-halftone processing to an L-bit image signal to thereby generate an M-bit image signal, where M<L holds, said first halftone processing means having means for generating a quotient and a remainder obtained by dividing input data by a predetermined value and said first halftone processing means having means for generating lower order bits based upon a comparison between the remainder and a random-number value;image processing means for executing image-signal multivalued processing using the M-bit image signal; andsecond halftone processing means for generating, from the multivalued-processed M-bit image signal, an image signal of predetermined bits corresponding to output means, wherein said first and second halftone processing means perform halftone processing in a density preserving type quantizing method.