VIDEO PROCESSING UNIT AND METHOD OF BUFFERING A SOURCE VIDEO STREAM

摘要

In a video system, a video source, e.g., a camera, provides a source video stream. The source video stream comprises a stream of image data units. A buffer control unit writes the image data units consecutively to a circular buffer. A display control unit reads the image data units consecutively from the circular buffer to generate a target video stream in accordance with a read delay. The display control unit comprises a feedback loop which controls timing of the operation of reading the image data units from the circular buffer so as to reduce a difference between the read delay and a reference delay. The video system may, for example, be installed in a vehicle, e.g., for providing a driver with a live view from a camera.

主权项

1. A video processing unit, connected or connectable to a video source so as to receive a source video stream from the video source, the source video stream comprising a stream of image data units forming a stream of video frames; wherein the video processing unit comprises:
a buffer control unit arranged to write the image data units consecutively to a circular buffer; and a display control unit arranged to read the image data units consecutively from the circular buffer to generate a target video stream, the display control unit having a read delay associated with it, said read delay being a delay of said operation of reading the image data units from the circular buffer relative to said operation of writing the image data units to the circular buffer; wherein the display control unit comprises a feedback loop arranged to control timing of said operation of reading the image data units from the circular buffer so as to reduce a difference between the read delay and a reference delay.