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A method for identifying wrong screenshots in page turning for slide smart screenshots

A recognition method and slideshow technology, applied in the field of image processing, can solve problems such as miscuts, and achieve the effects of solving ghosting miscuts and splicing miscuts

Active Publication Date: 2022-07-29
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there will be some misinterpreted screenshots when using the method of screen difference, mainly in the detection and interception of the page turning process of the slideshow

Method used

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  • A method for identifying wrong screenshots in page turning for slide smart screenshots
  • A method for identifying wrong screenshots in page turning for slide smart screenshots
  • A method for identifying wrong screenshots in page turning for slide smart screenshots

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Embodiment Construction

[0041] Below in conjunction with accompanying drawing and specific embodiment, the technical scheme of the present invention is further elaborated:

[0042] by figure 1 An example is used to illustrate the identification process of the present invention for the ghosting and mis-truncation generated when the pages overlap during the slide turning process. like figure 1 X, E, and Y shown in (a), (b), and (c) are three slide pictures that are identified from the video and continuously intercepted based on the degree of picture difference. Among them, E is formed by overlapping X and Y, which satisfies the transparency superposition formula E=aX+(1-a)Y, where a is transparency, and the formula indicates that E is formed by superposing X and Y after being transparent.

[0043] Step 1: Calculate the transparency matrix A using the inverse formula of the transparency overlay formula:

[0044]

[0045] In the formula, the division sign "-" means dividing by element, so matrix ...

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Abstract

The invention discloses a page-turning mis-cutting identification method oriented to a slideshow intelligent screenshot scene, including two identification methods of page overlapping and splicing. The step of identifying whether the image E is formed by overlapping X and Y includes: calculating the transparency matrix A by using the inverse formula of the transparency formula, calculating the mean value and variance of A after processing the outliers in A; judging that the images overlap according to the mean value and variance of A Happening. The step of identifying whether the image F is formed by splicing the image Z and other images includes: selecting a number of windows in the image Z, screening according to the variance of the pixel values ​​in the windows, and obtaining a set of windows to be matched {W Z }; to {W Z Each window in } goes to F for image matching, removes window pairs with too low matching values, and obtains a set of matching window pairs {(W Z , W F )}; according to {(W Z , W F )} to calculate the displacement vector set {V}; count the data in {V} to obtain a histogram, and judge the image stitching situation according to the histogram.

Description

technical field [0001] The invention relates to the field of image processing, in particular to a method for recognizing page-turning mis-cuts for intelligent screenshots of slides. Background technique [0002] In live broadcast scenarios such as academic seminars and business conferences, there will be many slides that are matched with speeches. These slides often contain a huge amount of information, which has led to the need to save and archive screenshots of these slides. The use of manual screenshots to save slideshow pages has problems of low efficiency and high cost, so it is the first choice to use software to automatically take screenshots. The software can use the basic idea of ​​taking screenshots when the screen difference changes. The screen difference refers to the degree of difference between two adjacent key frames in the video. When it detects a peak in the screen difference in the live screen, it means that the screen has occurred once. The mutation corre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06V10/50G06V10/75G06K9/62
CPCG06V10/50G06F18/22
Inventor 张晖叶子皓赵海涛孙雁飞朱洪波
Owner NANJING UNIV OF POSTS & TELECOMM