I-frame size estimation based on edge strength

摘要

Various embodiments of the present invention relate to systems, devices and method of video encoding that select a quantization parameter set based on a global edge strength value and an available bitrate for a corresponding compressed frame. Quantization parameters are selected using a mathematical correlation between the global edge strength value of the I-frame and an available bitrate/maxim target frame size for the corresponding compressed frame.

主权项

1. A video encoding system comprising
a reference decoder comprising at least one buffer to constrain bitstream data by setting an available bitrate based on an amount of data stored within the at least one buffer; a rate quantization model module, coupled to receive the available bitrate and a global edge strength value of an intra-coded video frame (I-frame) indicative of the magnitude of edges within the I-frame, the rate quantization model module selects a preferred set of quantization parameters for the video frame from a plurality of sets of quantization parameters based on the available bitrate and the global edge strength value only, said selection is made only on a frame basis; a video encoder, coupled to receive the preferred set of quantization parameters, the video encoder performs a quantization operation in accordance with the preferred set of quantization parameters during an encoding procedure of the I-frame.