Image processing apparatus and image processing method

Abstract

In a sample adaptive offset (SAO), the coding efficiency is improved by selecting an optimum mode among a plurality of modes based on a technique called a band offset and an edge offset. However, a processing amount of the SAO tends to increase when an optimum mode and an offset value are set, and this may result in an increase in a circuit size or power consumption. In this regard, the present disclosure proposes to enable reducing a processing amount of a cost calculation of the sample adaptive offset. According to the present disclosure, there is provided an image processing apparatus, including: a control unit configured to set an offset value to be applied to a pixel of an image, from among candidates of the offset value restricted according to a bit depth of the image; and a filter processing section configured to perform a filter process of applying the offset value set by the control unit to the pixel of the image.

1 . An image processing apparatus, comprising:
 a setting unit configured to set a band offset mode as a sample adaptive offset (SAO) mode as a condition that transform skip is applied;   a filter unit configured to apply a sample adaptive offset to a locally decoded image according to the band offset mode set by the setting unit to generate filtered image data; and   an encoding unit configured to encode image data using the filtered image data,   wherein the setting unit, the filter unit, and the encoding unit are each implemented via at least one processor.   
     
     
         2 . The image processing apparatus according to  claim 1 ,
 wherein the setting unit is configured to set the band offset mode as a condition that strong-intra-smoothing is applied.   
     
     
         3 . An image processing method, implemented via at least one processor, the method comprising:
 setting a band offset mode as a sample adaptive offset (SAO) mode as a condition that transform skip is applied;   applying a sample adaptive offset to a locally decoded image according to the set band offset mode to generate filtered image data; and   encoding image data using the filtered image data.   
     
     
         4 . The image processing method according to  claim 3 , further comprising:
 setting the band offset mode as a condition that strong-intra-smoothing is applied.