Method and device for inserting key frame in video encoding
A technology of video encoding and inserting devices, which is applied in the field of encoding, and can solve the problems of reduced picture quality, easy waste of code rate, easy loss of information, etc., and achieve the effect of not easy to waste code rate, easy to lose information, and convenient evaluation
Active Publication Date: 2015-11-18
ZHUHAI JIELI TECH
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Problems solved by technology
This method is easy to waste the bit rate in a relatively static scene, and it is easy to lose information when the picture changes rapidly, resulting in a decrease in picture quality
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[0044] In order to make the purpose, technical solution and advantages of the present invention clearer, the specific implementation manners of the method and device for inserting key frames in video coding of the present invention will be described below with reference to the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0045] see figure 1, in one embodiment, the insertion method of key frame in the video coding of the present invention can comprise the following steps:
[0046] S100. Collect encoded image data.
[0047] Wherein, the coded image data may be collected by a video collection device, and the coded image data may be sent to other devices for subsequent processing.
[0048] S200. Calculate the evaluation parameter of the current frame in the coded image data and the difference between the evaluation parameters of the current frame. ...
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The invention discloses a method and a device for inserting a key frame in video encoding. The method comprises the steps of: collecting encoded image data; calculating evaluation parameters of a current frame in the encoded image data, and then calculating the differences of the evaluation parameters of the current frame and the cumulative sums of the differences of the evaluation parameters; judging that whether the differences of the evaluation parameters of the current frame or the cumulative sums of the differences of the evaluation parameters meet preset conditions, and if yes, setting the current frame to be the key frame; and if no, setting the current frame to be a non-key frame, and returning to the step of calculating the evaluation parameters of the current frame in the encoded image data until encoding ends. The device comprises a data collection module, an evaluation parameter calculating module and a key frame setting module. According to the method and the device for inserting the key frame in video encoding, evaluation expense for the key frame can be saved.
Description
technical field [0001] The invention relates to the technical field of coding, in particular to a method and device for inserting key frames in video coding. Background technique [0002] A video surveillance system usually includes a video acquisition device (Sensor), a digital signal processor (DSP), a video image compression device (Codec), etc. The Sensor collects data and the collected data is analyzed and processed by the DSP, and then sent to the Codec for encoding , and finally obtain the corresponding video compression code stream. In the mainstream encoding method, Codec usually adopts encoding standards such as Mpeg4 / h.264. These standards need to dynamically add encoding key frames during the encoding process to ensure that the image quality and encoding bit rate meet the requirements. Generally speaking, when the picture changes significantly, it is necessary to insert key frames to better preserve the information. However, due to the limitation of cost and co...
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Inventor 陈家大
Owner ZHUHAI JIELI TECH