Abstract
Rate-distortion optimization (RDO) selects the mode that achieves the highest coding performance at the minimum cost after all coding modes have been computed. Unfortunately, the extreme complexity of RDO operations can severely impact real-time applications. To save coding time, we propose intra-mode-ignored decision and early skip mode prediction procedures. The former is based on the inter-coding results, such that the intra-mode may be disregarded for predictive frame coding. In the latter, a simple criterion can determine whether skip mode should be employed before performing the intra- and inter-mode procedures. Experimental results show that these two methods can significantly reduce the encoding time, by an average approximately 24 and 15%, respectively. A hybrid of the two methods could save an additional 36%, while maintaining an optimum RD.
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