Image processing apparatus and method

An image processing method comprising:

• arranging a bit depth of residual data of a color difference component and a bit depth of residual data of a luminance component to be uniform in a case where the bit depth of the residual data of the color difference component of an image and the bit depth of the residual data of the luminance component of the image are different from each other;
• predicting residual data of the color difference component in accordance with the set bit depth by using the residual data of the luminance component and generating predicted residual data;
• and
• coding the generated predicted residual data.

An image processing apparatus comprising:

• a decoding unit that decodes coded data of predicted residual data acquired by predicting residual data of a color difference component of an image by using residual data of a luminance component of the image;
• a setting unit that arranges a bit depth of the residual data of the color difference component and a bit depth of the residual data of the luminance component to be uniform in a case where the bit depth of the residual data of the color difference component and the bit depth of the residual data of the luminance component are different from each other;
• and
• a residual restoring unit that restores the residual data of the color difference component in accordance with the bit depth set by the setting unit by using the residual data of the luminance component and the predicted residual data acquired by decoding the coded data using the decoding unit.

An image processing method comprising:

• decoding coded data of predicted residual data acquired by predicting residual data of a color difference component of an image by using residual data of a luminance component of the image;
• arranging a bit depth of the residual data of the color difference component and a bit depth of the residual data of the luminance component to be uniform in a case where the bit depth of the residual data of the color difference component and the bit depth of the residual data of the luminance component are different from each other;
• and
• restoring the residual data of the color difference component in accordance with the set bit depth by using the residual data of the luminance component and the predicted residual data acquired by decoding the coded data.