Seamless switching method for video source

Abstract

The invention relates to a seamless switching method for a video source and is applied to a video processor which is configured with a main channel, and a PIP (picture in picture) channel and is suitable for connecting a first video source and a second video source, wherein the method comprises the steps as follows: a) receiving a video source switching instruction; b) starting output of a PIP channel, displaying a picture of the first video source output by the PIP channel in the top and completely covering the picture of the first video source output by the main channel; c) switching the input source of the main channel from the first video source to the second video source; d) setting an image processing parameter of the main channel and outputting a picture display parameter while the signal of the second video source is stable and waiting of the signal is not over-timed, and displaying the picture of the second video source output by the main channel in the top according to appointed picture switching special effect; and e) closing the output of the PIP channel. Therefore, the method of the invention could solve the problem of short blank screen and stiff switching effect in the video source switching process in prior art, and could realize the switching special effect of a plurality of pictures.

Description

technical field [0001] The invention relates to the technical field of display control, in particular to a method for seamlessly switching video sources. Background technique [0002] Due to its ultra-high brightness, contrast and large size, LED display screens have been widely used in advertising, ceremonies, live broadcasts and other broadcasting occasions. The general LED display control system consists of three parts: video processor, sending card and receiving card. The video processor has rich input interfaces, which can convert any input source into DVI or HDMI signal, and then transmit it to the sending card through the cable. After the sending card buffers and processes the image input by the DVI or HDMI interface, it converts the control signal and image data into a fixed-format data packet according to a specific protocol, and then transmits it to the receiving card through Gigabit Ethernet or other interfaces. After receiving the signal of a specific format, t...

AI Technical Summary

Problems solved by technology

[0004] However, the existing technology is limited by the structure and working principle of the hardware, so that the implementation method of seamless switching has the following disadvantages: 1) The switching effect is single and rigid, that is, when the receiving card seamlessly switches, the last input source needs to be The last frame of the image is repeatedly displayed. After the new input source is stable, the new image will be displayed normally. This will cause the image to freeze for a certain period of time, causing the switching process to be stiff and affecting the audience's experience. The ability is limited, and it is impossible to realize other seamless switching effects such as fade in and fade out, animation pop-up, etc., and the switching effect is not ideal; After a new input source is installed, the size or frame rate of the image sent by the sending card changes, causing the parameters of the sending card to be reconfigured, etc. What is more serious is that some receiving cards may not even receive the correct image, and the display screen part Huaping or black screen

[0006] However, in prior art 2, the space of the buffer module and the output module varies with the format of the input source image, and the format of the output image will also be affected by the line and field synchronization information of the input image. , there are changes in image size, line frequency and field frequency, which will cause slight setbacks on the screen on the LED display screen, and even in some cases, there are problems such as screen flickering caused by untimely update of receiving card parameters after switching

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