Image processing apparatus and image processing method

Abstract

The present disclosure relates to an image processing apparatus and an image processing method each of which causes an encoding efficiency of information indicating a prediction mode of a color component in the case where a prediction mode of a luminance component of an image is an intra BC prediction mode to be enhanced. In the case where a prediction mode of a luminance component of an image is an intra BC prediction mode, an encoding section encodes prediction mode information indicating a prediction mode of a color component of the image by using, as a context, that the prediction mode of the luminance component of the image is the intra BC prediction mode. The present disclosure, for example, can be applied to an image encoding apparatus or the like.

1 . An image processing apparatus, comprising:
 a decoding section, in a case where a prediction mode of a luminance component of an image is an intra BC prediction mode, decoding information indicating a prediction mode of a color component of the image by using, as a context, that the prediction mode of the luminance component is the intra BC prediction mode,   wherein a configuration is made in such a way that in a case where it is used as the context that the prediction mode of the luminance component is the intra BC prediction mode, the decoding section decodes information indicating the prediction mode of the color component which is encoded such that in a case where the prediction mode of the color component is the intra BC prediction mode, a compression rate becomes high, and   wherein the decoding section is implemented via at least one processor.   
     
     
         2 . The image processing apparatus according to  claim 1 , wherein
 a configuration is made in such a way that the prediction mode of the color component is an inter prediction mode, an intra prediction mode, an intra BC prediction mode, an LMchroma prediction mode, or a CrossColor prediction mode.   
     
     
         3 . The image processing apparatus according to  claim 1 , wherein
 a configuration is made in such a way that the information indicating the prediction mode of the color component is information indicating whether or not the prediction mode of the color component is identical to the prediction mode of the luminance component.   
     
     
         4 . The image processing apparatus according to  claim 1 , further comprising:
 an acquisition section, in a case where the prediction mode of each of the luminance component and the color component is the intra BC prediction mode, acquiring motion vector information indicating a motion vector used in the prediction processing of the intra BC prediction mode of the color component, the motion vector information being generated based on the motion vector used in the prediction processing of the intra BC prediction mode of the luminance component.   
     
     
         5 . The image processing apparatus according to  claim 4 , wherein
 a configuration is made in such a way that the motion vector information is information indicating that the motion vector used in the prediction processing of the intra BC prediction mode of the color component is identical to the motion vector used in the prediction processing of the intra BC prediction mode of the luminance component, and   the acquisition section sets the motion vector used in the prediction processing of the intra BC prediction mode of the luminance component as the motion vector used in the prediction processing of the intra BC prediction mode of the color component based on the motion vector information.   
     
     
         6 . The image processing apparatus according to  claim 4 , wherein
 a configuration is made in such a way that the motion vector information is a difference between the motion vector used in the prediction processing of the intra BC prediction mode of the color component and the motion vector used in the prediction processing of the intra BC prediction mode of the luminance component, and   the acquisition section sets an addition value of the difference and the motion vector used in the prediction processing of the intra BC prediction mode of the luminance component as the motion vector used in the prediction processing of the intra BC prediction mode of the color component based on the motion vector information.   
     
     
         7 . An image processing apparatus, comprising:
 a decoding section, in a case where a prediction mode of a luminance component of an image is an intra BC prediction mode, decoding information indicating a prediction mode of a color component of the image by using, as a context, that the prediction mode of the luminance component is the intra BC prediction mode,   wherein a configuration is made in such a way that in a case where the intra BC prediction mode of the luminance component is valid, the decoding section decodes information indicating whether or not the intra BC prediction mode of the color component is valid, and   wherein the decoding section is implemented via at least one processor.   
     
     
         8 . An image processing method executed by an image processing apparatus, comprising:
 decoding, in a case where a prediction mode of a luminance component of an image is an intra BC prediction mode, information indicating a prediction mode of a color component of the image by using, as a context, that the prediction mode of the luminance component is the intra BC prediction mode,   wherein a configuration is made in such a way that in a case where it is used as the context that the prediction mode of the luminance component is the intra BC prediction mode, the information indicating the prediction mode of the color component which is encoded is decoded such that in a case where the prediction mode of the color component is the intra BC prediction mode, a compression rate becomes high.