	US 7,573,508 B1
	Image signal processing apparatus and method for performing an adaptation process on an image signal
Tetsujiro Kondo, Tokyo (Japan); Hideo Nakaya, Kanagawa (Japan); and Takashi Sawao, Tokyo (Japan)
Assigned to Sony Corporation, Tokyo (Japan)
Appl. No. 9/673,532 PCT Filed Feb. 18, 2000, PCT No. PCT/JP00/00950 § 371(c)(1), (2), (4) Date Nov. 27, 2000, PCT Pub. No. WO00/49812, PCT Pub. Date Aug. 24, 2000.
Claims priority of application No. 11-041114 (JP), filed on Feb. 19, 1999; application No. 11-082228 (JP), filed on Mar. 25, 1999; and application No. 11-151859 (JP), filed on May 31, 1999.
Int. Cl. E09O 5/01 (2006.01)

U.S. Cl. 348—224.1 [348/273; 348/246; 348/234; 348/222.1; 348/276; 348/279; 348/272; 348/235; 348/252; 348/253; 348/624; 386/69; 386/38; 386/117; 382/264; 382/300; 382/195; 382/205; 382/254; 382/260]

52 Claims

1. An image-signal processing apparatus for processing an input image signal at a position of each pixel, said input image signal of each pixel having only one of various color components, said apparatus comprising:

defect-correcting means for correcting defective pixels in the input image signal;

clamping means for clamping the input image signal to eliminate shifted components of the defect-corrected image signal;

white-balancing means for white-balancing the input image signal to correct the gain of the clamped image signal supplied from the clamping means;

extraction means for extracting a plurality of pixels located near each pixel of interest of the white-balanced image signal in accordance with the color component of each pixel of interest;

class-determining means for determining a class from the pixels extracted by the extraction means; and

pixel-generating means for generating more than one color components for the pixel of interest in accordance with the class determined by the class-determining means, wherein the more than one color components include one color component that is the same as that of the input signal of the pixel of interest and a color component that is different from that of the input signal of the pixel of interest.