A method and device for determining video effective area in composite video signal

Abstract

A method and device for determining an effective video area in a composite video signal, the method comprising: receiving a multi-frame composite video signal, correspondingly converting it into a digital signal, performing signal synchronization, and calculating each frame of a preset number of frames in the digital composite video signal The first information entropy of the video signal line of the same line number in the signal, determine the line number of the video signal line whose first information entropy is greater than the first threshold, and the video signal line corresponding to the minimum line number and the maximum line number included in the line number The video signal lines between are determined as effective signal lines, and the second information entropy of the preset number of video signal lines in the preset sliding time window is calculated, and the boundary points of the video effective areas of the video signal lines are determined according to the second information entropy, and the The area within the boundary points is determined as the effective area of ​​the video signal, and the overlap area between the determined effective signal line and the effective area is determined as the effective area of ​​the video in the composite video signal. In this way, determining the effective area of ​​the video no longer depends on the video standard.

Description

technical field [0001] The present application relates to the field of composite video signal analysis, in particular to a method and device for determining an effective video area in a composite video signal. Background technique [0002] A composite video signal refers to a single-channel analog signal in which the components that need to generate a video signal are combined in the same signal. The three main components that constitute a composite video signal include a brightness signal, a chroma (color and saturation) signal, and a synchronization signal. Among them, The luminance signal contains the intensity (brightness or darkness) information of the video image, and the chrominance signal contains the color and saturation information of the video image. Composite video signals usually use encoding methods including National Television Standards Committee (NTSC), Pal (Phase Alternating Line, PAL), Sequentiel Couleur A Memoire (SECAM) and HDCVI (High Definition Composi...

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Problems solved by technology

[0006] The embodiment of the present application provides a method and device for determining the video effective area in the composite video signal, which is used to solve the problem of excessive dependence on the video standard when determining the video effective area in the composite video signal in the prior art. When the signal form parameters corresponding to the standard of the composite video signal are stored or the stored signal form parameters are lost, the effective area of ​​the video in the composite video signal cannot be determined, and thus the video image cannot be restored

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