Rapid HEVC CU deep partition coding method

The invention discloses a rapid HEVC CU deep partition coding method. The CU deep partition process is improved. The other seven types of inter-frame PU modes except the inter-frame N*N mode are divided into three modes, namely, the Mode 1, the Mode 2 and the Mode 3, wherein the Mode 1 represents that the CU movement tends to be smooth, the Mode 2 represents that the CU movement tends to be moderate, and the Mode 3 represents that the CU movement tends to be complex. The probability distribution of the optimal prediction modes, namely, the Mode 1, the Mode 2 and the Mode 3, of a CU at different depth is obtained in advance through a statistical method, and different inter-frame PU mode classifications are set for the CU at different depths according to the Mode 1, the Mode 2 and the Mode 3. In the CU division process, after the CU traverses the inter-frame modes and inter-frame mode prediction at present, if the CU meets the requirement that both the CBF value and the MVD value are zero at the current depth and the optimal prediction mode of the CU is the inter-frame PU mode and meets the correspondingly-set inter-frame PU mode classification, the quad-tree division of the current CU is stopped in advance, and therefore the CU depth division operation time of the inter-frame mode part is effectively shortened, and the coding efficiency is improved.