Rapid selection method for video intra prediction mode and apparatus thereof

A non-transitory computer readable medium that stores a set of instructions that is executable by at least one processor of an intra prediction mode selection device to cause the intra prediction mode selection device to perform a method for intra prediction mode selection, the method comprising:

• acquiring a gradient amplitude and a gradient angle of each element in a prediction block;
• analyzing statistics on the gradient angles and generating a gradient angle histogram of the prediction block;
• determining, based on the analysis, texture smoothness of the prediction block;
• in response to a determination that the texture smoothness of the prediction block is greater than a first pre-determined threshold value:
• setting a prediction mode of the prediction block to comprise a direct current prediction mode and a planar prediction mode;
• and
• in response to a determination that the texture smoothness of the prediction block is less than a second pre-determined threshold value:
• setting an angular prediction mode of the prediction block to comprise an angular prediction mode corresponding to a maximum peak value in the gradient angle histogram,
• wherein the first pre-determined threshold value is greater than the second pre-determined threshold value.

An apparatus for intra prediction mode selection, comprising:

• a memory storing instructions;
• and
• a processor configured to execute the instructions to cause the apparatus to:
• acquire a gradient amplitude and a gradient angle of each element in a prediction block;
• analyze statistics on the gradient angles and generating a gradient angle histogram of the prediction block;
• determine, based on the analysis, texture smoothness of the prediction block;
• in response to a determination that the texture smoothness of the prediction block is greater than a first pre-determined threshold value:
• set a prediction mode of the prediction block to comprise a direct current prediction mode and a planar prediction mode;
• and
• in response to a determination that the texture smoothness of the prediction block is less than a second pre-determined threshold value:
• set an angular prediction mode of the prediction block to comprise an angular prediction mode corresponding to a maximum peak value in the gradient angle histogram,
• wherein the first pre-determined threshold value is greater than the second pre-determined threshold value.