Patent ID: 8786623

Claim:
An image processor that corrects an image signal, the image processor comprising: a memory that stores an unextracted brightness component of the image signal; a signal extracting circuit that extracts a signal in a predetermined spatial frequency band from the unextracted brightness component of the image signal; a brightness component correction amount calculating section that receives the signal in the predetermined spatial frequency band extracted by the signal extracting circuit and that receives the unextracted brightness component of the image signal, the brightness component correction amount calculating section calculating an amount of correction of the unextracted brightness component of the image signal only for the signal in the predetermined spatial frequency band extracted by the signal extracting circuit; and a brightness component correcting section that receives the amount of correction calculated by the brightness component correction amount calculating section and the unextracted brightness component of the image signal and that corrects the unextracted brightness component of the image signal by using the amount of correction calculated by the brightness component correction amount calculating section, wherein the brightness component correction amount calculating section includes a brightness gain calculating circuit that receives the unextracted brightness component of the image signal directly from the memory, the brightness gain calculating circuit calculating a brightness gain corresponding to the level of the unextracted brightness component of the image signal, and wherein the brightness component correction amount calculating section calculates the amount of correction of the unextracted brightness component on the basis of the signal in the predetermined spatial frequency band extracted by the signal extracting circuit and the brightness gain calculated by the brightness gain calculating circuit.