Frame extracting method for conversion from ultrahigh-frame-frequency image flow to standard analog video flow

Abstract

The invention relates to a frame extracting method for conversion from an ultrahigh-frame-frequency image flow to a standard analog video flow. A triggering signal of the standard analog video flow issynchronized with a triggering signal of the ultrahigh-frame-frequency image flow; simultaneously, the phase relationship between the triggering signal of the ultrahigh-frame-frequency image flow andthe triggering signal of the standard analog video flow is adaptively adjusted; a frame of image signal is extracted from the ultrahigh-frame-frequency image flow according to an analog video period;the conflict between an ultrahigh-frame-frequency image processing time sequence and a standard analog video display time sequence can be effectively avoided; and thus, conversion from the ultrahigh-frame-frequency image flow to the standard analog video flow is realized. The method is implemented in an engineering manner; on the premise that the ultrahigh-frame-frequency image flow processing time sequence is not influenced and hardware storage resource consumption is not increased, conversion from the ultrahigh-frame-frequency image flow to the standard analog video flow can be realized; visual observation can be conveniently carried out; and the frame extracting method disclosed by the invention has good engineering applicability.

Description

technical field [0001] The invention belongs to the technical field of image processing, and relates to a frame extraction method for converting an ultra-high frame rate image stream to a standard analog video stream. Background technique [0002] In the infrared imaging guidance system, as the distance between the missile and the target approaches, the target gradually increases to form an unstable patch, and finally fills the entire field of view at a very fast speed. In the supersonic era, this process may only occur within a few seconds. Inside. The standard analog video, taking the PAL system as an example, can only collect 40 frames of image data per second, which is obviously too slow for a high-speed guidance system, which requires the infrared detector to work in the high-speed external trigger mode , the output frame rate can reach hundreds or even thousands of hertz. For the convenience of visual observation, it is still necessary to realize the analog video dis...

AI Technical Summary

Problems solved by technology

The method used in the past is to directly extract a frame of image from the ultra-high frame rate image stream according to the analog video cycle to realize the analog display, but this method has the following disadvantages: First, the method of directly extracting frames for display requires the triggering of the ultra-high frame rate image stream The period of the signal must be an integer multiple of the period of the analog video; second, there is no definite phase relationship between the analog video signal and the trigger signal of the ultra-high frame rate image stream, and timing conflicts are prone to occur; third, when the frequency of the ultra-high frame rate image stream When it is too high, the process of directly extracting one frame of data from multiple frames to realize the analog display is extremely cumbersome

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