Image encoding and/or decoding system, medium, and method

An image encoding method, comprising:

• generating first residues corresponding to differences between color components of a current image and color components of a predicted image;
• predicting second residues with respect to the first residues, the predicted second residues corresponding to color components other than a first color component by using a reconstructed first residue of the first color component reconstructed from a processing of a first residue of the first color component generated in the generating of the first residues;
• encoding the first residue of the first color component and the second residues of the color components other than the first color component;
• and
• predicting a second residue of the first color component based on the reconstructed first residue of the first color component for a current pixel and reconstructed first residues of the first color component for one or more other pixels,
• wherein, in the predicting of the second residues with respect to the first residues, the predicted second residue of the first color component is applied to the first residues corresponding to the color components other than the first color component.

An image decoding system, comprising:

• a residue obtaining unit to receive a first residue for a first color component and second residues for color components other than the first color component, with the second residues having been derived from the first residue for the first color component;
• a residue compensation unit to generate first residues for the color components other than the first color component from the second residues of the color components other than the first color component by using the first residue of the first color component;
• a restoring unit to restore a corresponding image by adding the first residue of the first color component and the generated first residues of the color components other than the first color component to corresponding color components of a predicted image;
• and
• an operation unit to obtain a second residue of the first color component based on the first residue of the first color component for a current pixel and the first residues of the first color component for one or more other pixels,
• wherein the residue compensation unit applies the second residue of the first color component to the second residues for color components other than the first color component.

An image decoding method comprising:

• receiving a first residue for a first color component and second residues for color components other than the first color component, with the second residues having been derived from the first residue for the first color component;
• generating first residues for the color components other than the first color component from the second residues of the color components other than the first color component by using the first residue of the first color component;
• restoring a corresponding image by adding the first residue of the first color component and the generated first residues of the color components other than the first color component to corresponding color components of a predicted image;
• and
• obtaining a second residue of the first color component based on the first residue of the first color component for a current pixel and the first residues of the first color component for one or more other pixels,
• wherein the generation of the first residues includes applying the second residue of the first color component to the second residues for color components other than the first color component.

An image encoding method comprising:

• setting a flag that selectively represents execution and non-execution of color prediction for each of a plurality of macroblocks into which a current image is divided;
• generating first residues corresponding to differences between color components of a current image and color components of a predicted image;
• de-quantizing and inverse spatial transforming a quantization of a first residue of a first color component to generate a reconstructed first residue when the flag is set to execute color prediction with respect to a corresponding macroblock;
• predicting second residues with respect to the generated first residues, the predicted second residues corresponding to color components other than the first color component by using the reconstructed first residue of the first color component;
• encoding the first residue of the first color component and the second residues of the color components other than the first color component;
• and
• predicting a second residue of the first color component based on the reconstructed first residue of the first color component for a current pixel and reconstructed first residues of the first color component for one or more other pixels,
• wherein, in the predicting of the second residues with respect to the generated first residues, the predicted second residue of the first color component is applied to the first residues corresponding to the color components other than the first color component.

An image decoding method, comprising:

• receiving and preprocessing a bitstream for a first residue of a first color component and second residues for color components other than the first color component, with the second residues having been derived from the first residue for the first color component, of an image divided into a plurality of macroblocks;
• determining whether a flag selectively representing execution and non-execution of color prediction on a current macroblock is set within the bitstream;
• generating first residues for the color components other than the first color component from the second residues of the color components other than the first color component by using the first residue of the first color component when the flag is set to execute the color prediction on the current macroblock;
• restoring the image by adding the first residue of the first color component and the generated first residues of the color components other than the first color component to corresponding color components of a predicted image;
• and
• obtaining a second residue of the first color component based on the first residue of the first color component for a current pixel and the first residues of the first color component for one or more other pixels,
• wherein the generation of the first residues includes applying the second residue of the first color component to the second residues for color components other than the first color component.