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A code rate control method for i-frame based on residual frequency domain complexity

A control method and technology of complexity, applied in the fields of digital video signal modification, electrical components, image communication, etc., can solve the problems of limited improvement of I-frame bit rate control effect, inaccurate I-frame complexity measurement and bit rate model, etc. Achieve the effect of solving the violent fluctuation of fullness and improving the encoding quality

Active Publication Date: 2017-04-19
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

Therefore, the intra-frame complexity measurement based on spatial pixel gradient or pixel entropy information does not match the intra-frame coding characteristics of H.264, resulting in inaccurate I-frame complexity measurement and bit rate model, and limited improvement in the effect of I-frame bit rate control

Method used

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  • A code rate control method for i-frame based on residual frequency domain complexity
  • A code rate control method for i-frame based on residual frequency domain complexity
  • A code rate control method for i-frame based on residual frequency domain complexity

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Embodiment Construction

[0044] The invention will be described in further detail below in conjunction with the accompanying drawings.

[0045] Such as figure 1 and figure 2 As shown, the present invention provides a method for controlling the code rate of an I frame based on residual frequency domain complexity, which is specifically a method for controlling the code rate of an H.264 I frame, comprising the steps of:

[0046] 1) Read in the I-frame image to be encoded in the video sequence. If it is the first frame of the sequence, set the initial buffer level to zero, that is, curr_buff_level=0; and set the parameters c and d in the I-frame bit rate model as empirical values.

[0047] 2) Calculate the target number of bits allocated to the current I frame according to the target bit rate, the predefined frame rate and the current buffer level. The formula is as follows:

[0048]

[0049] where R intra is the target bit number of I frame, bit_rate is the target bit rate, frame_rate is the pr...

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Abstract

The invention discloses an I-frame code rate control method based on residual frequency domain complexity. The method includes the steps of reading in an I-frame image, setting the level of an initial buffer area to be zero if the image is the first frame of a sequence, and setting two parameters of an I-frame code rate quantitative model as experience values; calculating a target bit number of the current I-frame according to a target code rate, a frame rate and buffer area fullness; calculating the average absolute value of a frequency domain coefficient of a predicted residual in a brightness component frame to serve as encoding complexity; according to a suggested I-frame code rate-quantitative-complexity model, calculating a quantitative step size; carrying out rate-distortion optimized encoding on the current I-frame through the calculated quantitative step size, and determining the optimal encoding mode of each macro block; if the first frame of the sequence is encoded currently, not needing to update the parameters of the code rate model, using an actual encoding result of the frame encoded before if a second frame of the sequence is encoded, and updating the parameters by means of a linear regression mode; reading in a next I-frame for encoding until all frames of the sequence are encoded.

Description

technical field [0001] The invention relates to the technical field of computer video coding, in particular to an I-frame code rate control method based on residual frequency domain complexity. Background technique [0002] At present, the H.264 standard is widely used in various fields of video coding and transmission due to its high compression efficiency. Bit rate control, as the key technology, adjusts the quantization parameters to make the actual bit rate close to the target bit rate, and at the same time has better video quality, which is an indispensable part of the actual video coding application. However, most of the rate control technologies at present are aimed at P frames, and there are few researches on the rate control technologies of I frames. Existing I-frame bit rate control methods often encode by setting empirical quantization parameters without considering the complexity of I-frame encoding, resulting in poor I-frame bit rate control and sharp fluctuati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/124H04N19/147
Inventor 崔子冠干宗良唐贵进刘峰朱秀昌
Owner NANJING UNIV OF POSTS & TELECOMM
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