Method for binarizing intra prediction mode and method, apparatus, and system for decoding intra prediction mode

A method for coding an intra prediction mode of a video frame, the method comprising:

• acquiring, by at least one processing device, an intra prediction mode of a luma component, if the intra prediction mode of the luma component is one kind of prediction mode in M, modifying a value of a serial number of a prediction mode Luma Angle of a chroma component to I, wherein the prediction mode Luma Angle means a chroma component prediction mode using a same prediction direction as the luma component, and then sequencing all prediction modes of the chroma component except the acquired intra prediction mode according to a preset rule, wherein
• a set of the same intra prediction modes of the luma component and the chroma component is M, and I is less than the value of the serial number of the Luma Angle, wherein the value is a value before modification;
• and
• performing, by the at least one processing device, binarization on the modified Luma Angle, and sending the binarized chroma prediction mode to the decoding end;
• wherein the preset rule comprises:
• if the acquired intra prediction mode is another prediction mode outside M, adding 1 to a value of a serial number, which is less than or equal to a value of a serial number of the acquired intra prediction mode and greater than or equal to I, among all the prediction modes of the chroma component except the acquired intra prediction mode, and
• if the acquired intra prediction mode belongs to M, adding 1 to a value of a serial number, which is less than I, among all the prediction modes of the chroma component except the acquired intra prediction mode;
• wherein values of serial numbers of all the prediction modes of the chroma component are numbered successively with natural numbers, and I is a natural number that is greater than or equal to zero.