Intra coding/decoding method and apparatus for color image

The present invention, four of the intra-encoding / decoding method and apparatus for a color image: 4: 4 Intra coding method of the picture type is added to block Intra prediction of (1) Chroma components in the video encoder (encoder) information wherein according to the procedure, (2) the original video block to the procedure, certain conditions of the process of the above (1), which integer transform by dividing the difference between the Intra prediction block at a predetermined block unit to perform in the same way as the Luma block in the same position without collecting only DC off the result of (2) is characterized in that it comprises the step of converting an integer. 4: 4: 4 Intra decoding method of the picture type in the video decoder (decoder), (1) step of performing the prediction in units of blocks Intra Chroma components in the same way as the Luma block in the same position without any additional information; (2) only the process of obtaining the conversion coefficient of the DC component of the inverse integer transform DC component prediction error in accordance with certain conditions of the process of the above (1); 3 is characterized in that it comprises the step of obtaining the final prediction error by using the restored DC coefficient and the remaining coefficients of (2) reverse constant conversion of a certain block. According to the present invention, the Intra prediction information on Chroma component addition is obtained at Luma component no information is needed, can be improved Intra prediction performance. For RGB makes it possible to use the correlation that exists between the components in the encoding the coding efficiency improvement can be expected.