Patent ID: 8174592

Claim:
A color interpolation device comprising: a gradient grade calculation block calculating horizontal derivatives and vertical derivatives using composite video signals output from a current pixel and adjacent pixels and calculating a gradient grade using a linear composition of the horizontal derivatives and vertical derivatives; a horizontal/vertical YUV calculation block calculating horizontal YUV components and vertical YUV components of the current pixel from the composite video signals; a YUV/RGB conversion circuit mixing the horizontal YUV components and the vertical YUV components based on the gradient grade and converting mixed YUV components to RGB components, wherein the YUV/RGB conversion circuit comprises, a mixed YUV calculation block calculating the mixed YUV components by mixing the horizontal YUV components and the vertical YUV components according to the gradient grade, a fully de-saturated UV calculation block comparing a value of each of the horizontal UV components of the horizontal YUV components and a value of each of the vertical UV components of the vertical YUV components and calculating fully de-saturated UV components according to a result of the comparison, a controlled de-saturated UV calculation block mixing each of the mixed UV components and each of the fully de-saturated UV components and calculating controlled de-saturated UV components, and a YUV/RGB conversion block converting a mixed Y component and the controlled de-saturated UV components to RGB components.