Method and system for quantitative adjustment of image quality jump
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A technology for quantization adjustment and image quality, which is applied in the field of video coding and decoding, and can solve problems such as image quality jumps and flickering.
Inactive Publication Date: 2013-09-25
深圳市云宙多媒体技术有限公司
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[0003] The purpose of the embodiments of the present invention is to propose a quantitative adjustment method for image quality jumps, which aims to solve the problems of image quality jumps and flickering in the prior art when image quality jumps occur
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Embodiment 1
[0049] figure 1 It is a flowchart of a quantitative adjustment method for image quality jumps in a preferred embodiment of the present invention; the method includes the following steps:
[0050]Step1: If the current coded frame is a P frame and the next coded frame is an I frame, then enter Step2; otherwise, {firstly, encode the current coded frame; then, determine whether the next coded frame exists, if not, then end; Otherwise, let the current coded frame be the next coded frame, and then re-enter Step1. }
[0051] Step2: Determine whether the next coded frame is a scene switch relative to the current coded frame (that is, determine whether the next coded frame is a scene switch frame). If not, then flag=0; if so, then flag=1.
[0052] In the full text, flag is a scene switching flag variable; the scene switching detection method may adopt any method disclosed in the industry.
[0053] Step3: Calculate the first correction value of the quantization parameter of the curren...
Embodiment 2
[0084] image 3 It is a structural diagram of a quantitative adjustment system for image quality jumps in a preferred embodiment of the present invention; the system includes: a first judgment module, a first encoding processing module, a second judgment module, a first correction value calculation module, and a second encoding A processing module, a third judging module, a second correction value calculation module, and a third encoding processing module,
[0085] The first judging module is used to judge whether the current coded frame is a P frame and the next coded frame is an I frame, if otherwise, enter the first coding processing module, and if so, enter the second judging module;
[0086] The first encoding processing module is used to encode the current encoded frame; then, determine whether the next encoded frame exists, if not, then end; otherwise, make the current encoded frame the next encoded frame, and then re-enter the first judgment module ;
[0087] The sec...
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Abstract
The invention discloses a method and system for quantitative adjustment of image quality jump. According to the method and system for quantitative adjustment of the image quality jump, on one hand, a method for reducing a difference between a quantization parameter of a preset I frame and a quantization parameter of a before P frame in an image which possibly produces the image quality jump according to the phenomena that the problem of the image quality jump is only caused by the situations that the difference between the quantization parameter of the preset I frame and the quantization parameter of the before P frame is large, and the preset I frame and the before P frame belong to the same scene, thus, a flicker feeling produced due to the image quality jump is reduced, and the subjective effect of an encoder is improved; on the other hand, when the preset I frame and the before P frame belong to different scenes, the image cannot produce the flicker phenomenon even when the quantization parameter difference is large, and the preset I frame can serve as a starting reference frame of a new scene. According to the method and system for quantitative adjustment of the image quality jump, due to the fact that movement intensity is used for adjusting the quantization parameters, the encoder can further adjust the quantization parameters according to the complexity of an encoding film source, and optimization of the encoding objective performance can be achieved.
Description
technical field [0001] The invention relates to the field of video coding and decoding, in particular to a quantization adjustment method and system for image quality jumps. Background technique [0002] In the prior art, in a video sequence, when the previous image frame is a P frame with poor quality, and the next frame is an I frame of the same scene with good image quality, image quality jumps and flickering will occur. When using a small I-frame interval for low-bit-rate encoding for complex motion and multi-scene switching sequences, the above problems will be maximized. However, when the image quality of the front and back frames is very different but belongs to different scenes, the flickering feeling will be alleviated. The conventional quantization strategy does not make a special design for this, but uniformly uses the average quantization parameter of the P frame in the previous GOP (Group of Pictures) to determine the quantization parameter (QP) of the I frame ...
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