A real time frame rate control method and its device

Abstract

A real time frame rate control method is characterized in that: updating frame rate control factor FC according to frame rate control factor updating principle period, and using frame rate control register whose value length is B and containing dispatch frame whose identification number equals to FC to update frame rate control register; circulation using each bit of frame rate control register in turn as identifying bit to identify received each picture frame separately: when the picture frame corresponding identifying bit is dispatch frame identification, dispatching the frame; otherwise discarding the frame; the frame rate control factor updating principle is: using new frame rate control factor to make the ratio of it and B equal to the ratio of Ftarget and Fsensor, or closer the ratio of Ftarget and Fsensor than the ratio of frame rate control factor before updating; Ftarget and Fsensor is target frame rate and picture sensor outputting frame rate separately; the dispatch frame identification is 1 or 0.

Description

technical field [0001] The invention relates to a method for realizing real-time frame rate control in a digital camera and a real-time frame rate control device thereof. Background technique [0002] During the use of the camera, the output frame rate Fsensor of the image sensor is different from the frame rate required by the subsequent image processing module and image data transmission module. In order to avoid the congestion (queuing) phenomenon of image frames in the image processing module or image data transmission module due to the excessive size of Fsensor, it is usually necessary to set a target frame rate Ftarget, and set a frame rate control module to the output of the image sensor Image frame for frame rate control. [0003] The frame rate control method adopted in the prior art is to buffer the image frames output by the image sensor, and discard the image frame data stored in the current buffer queue at a fixed rate when Fsensor is greater than Ftarget. [...

AI Technical Summary

Problems solved by technology

However, in the actual application environment of the camera, it is likely that the exposure time of the image sensor will change due to the change of the scene, and the change of the exposure time will affect the output frame rate of the image sensor Fsensor

In this case, the frame rate control method using a fixed rate frame drop often results in excessive frame drop

Moreover, when the image frame data stored in the buffer queue is discarded, if the method of discarding at intervals is used to discard frames, that is, every several frames are discarded, a large number of linked list operations are required, and the system resource consumption is too large; Using the method of continuous frame loss will affect the continuity of the image

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