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A real-time video thumbnail method based on optimal cropping

A real-time video, the best technology, applied in the direction of image communication, selective content distribution, electrical components, etc., can solve the problems that affect the viewing experience, the imbalance between important content and unimportant content, etc., and achieve a good viewing experience without visual jitter , Calculation is simple and efficient

Active Publication Date: 2020-08-18
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method takes into account the needs of real-time zooming, it also has good coherence, but the method focuses on keeping the important content of the video image without obvious distortion, not completely deformed, and the video image is deleted non-uniformly The content may cause a disproportion between important content and unimportant content, affecting the viewing experience

Method used

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  • A real-time video thumbnail method based on optimal cropping
  • A real-time video thumbnail method based on optimal cropping
  • A real-time video thumbnail method based on optimal cropping

Examples

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Embodiment Construction

[0043] The present invention will be further described below in conjunction with specific examples.

[0044] Taking the case where the width and height of the demo video is 1920*1040, the width and height of the zoom target is 720*520, and the lens switching threshold is set to 0.4 as an example, the real-time video thumbnail method based on optimal cropping provided by this embodiment, see figure 1 The flow shown includes the following steps:

[0045] S1: Extract the current frame and the previous frame from the video stream;

[0046] If the current frame is the first frame of the video, generate an all-white image with the same resolution as the video and assign it to the previous frame.

[0047] S2: Determine whether to switch the lens

[0048] Calculate the histogram of the current frame and the previous frame and normalize it; then calculate the correlation coefficient of the normalized histogram of the current frame and the previous frame; if the correlation coefficien...

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Abstract

The invention discloses a real-time video abbreviation method based on optimal clipping. The method comprises the following steps: S1, extracting a current frame and a previous frame from a video stream; s2, judging whether a lens is switched or not; s3, calculating an explicit graph of the current frame; s4, searching an optimal cutting window on the explicit graph; s5, abbreviating the current frame; s6, replacing the processed frame in a video stream; and S7, if the next frame exists, enabling the previous frame to be equal to the current frame, extracting the next frame from the video stream as the current frame, and executing the steps S2-S7. According to the invention, the main information of the video frame can be retained, the video content is not deformed, the picture jitter is not caused, the visual coherence of the video is maintained, the efficiency and the expansibility are higher, and the video stream in the memory or the file can be zoomed in real time.

Description

technical field [0001] The present invention relates to the technical field of video playback and video image zooming, in particular to a real-time video thumbnail method based on optimal cropping. Background technique [0002] With the popularization of display devices such as TVs, notebooks, PDAs, and mobile phones, the diversity of display devices has increased dramatically, and the versatility of image and video media sources has increased. Adapting images to different resolutions and aspect ratios is important for improving image thumbnails. The user's viewing experience is becoming more and more important, and image and video thumbnails have become an important issue. Applying simple scaling or cropping directly usually causes loss of information in the video image and distortion of the content of the video image, for example, small objects displayed in the played video image cannot be seen clearly, or objects displayed in the played video image are long The aspect ra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N21/44H04N21/4402
CPCH04N21/44008H04N21/440245H04N21/440263
Inventor 郭礼华严开标李宇威
Owner SOUTH CHINA UNIV OF TECH
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