Collecting, encoding and compressing system for video stream

A video streaming and encoding technology, applied in closed-circuit television systems, digital video signal modification, television, etc., can solve problems such as being unfavorable to reduce the amount of video stream data, unable to effectively compress inter-frame redundant information, etc., and achieve strong scalability. Performance and flexibility, low frame rates, high compression effects

Inactive Publication Date: 2009-08-05
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, this compression standard cannot effectively compress redundant information between frames, and the image compression ratio can only reach several tens of times
More importantly: the existing hard compression chips often have clear requirements on the frame rate and image resolution of the system (such as 25 frames / second PAL, 30 frames / second NTSC format data), which is not conducive to reducing the video stream. amount of data

Method used

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  • Collecting, encoding and compressing system for video stream
  • Collecting, encoding and compressing system for video stream
  • Collecting, encoding and compressing system for video stream

Examples

Experimental program
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Embodiment

[0037]In the present embodiment, compression unit is to adopt the video hard compression chip ML86410 of MPEG4 video stream compression standard, and this chip supports single video stream compression and frame rate dynamic adjustment; Acquisition encoding unit adopts the adjustable CMOS image acquisition chip OV7660 of image size; The source impedance matching circuit is designed for the high-speed address signal between the video hard compression chip ML86410 and the external hardware data buffer; the multi-mode voltage control method is used to supply power to different parts of the system, which further reduces the power consumption of the device when it is idle.

[0038] Present embodiment takes MPEG4 video compression chip ML86410 as core, it is connected with 8 parallel buses between video acquisition and coding CMOS chip OV7660 on the one hand, links to each other with microcontroller Atmega128L by the mode of hardware address mapping on the other hand (being ML86410 It...

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PUM

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Abstract

The invention relates to a collecting, encoding and compressing system of a video stream, comprising the following steps: an collecting encoding unit collects a video image in a way of adjustable image size and, then obtains an original video stream data after encoding and sends the original video stream data to a compressing unit at a set frame rate; the compressing unit receives the original video stream data sent by the collecting encoding unit in a way of adjustable frame rate, then compresses stream data according to MPEG4 compressing standard and temporarily stores the compressed data in a register in the compressing unit; and a microcontroller is used for initializing all the parameters of the collecting encoding unit and the compressing unit, the register in the compressing unit is mapped as an outer register of the microcontroller in a hardware wiring way, and the compressed video stream data stored in the register is directly read by the microcontroller and sent out. The invention can realize small size, low frame rate and high compression rate, meets the user need of higher image quality by dynamically adjusting parameters, and has strong scalability and flexibility.

Description

technical field [0001] The invention relates to the field of video monitoring, especially suitable for the field of video monitoring based on low-bandwidth wireless communication technology, and specifically relates to a system for collecting, encoding and compressing video streams. Background technique [0002] With the continuous development of multimedia technology, wireless communication technology and sensor technology, multimedia wireless sensor network technology has aroused the general concern of the society. Multimedia applications with video, audio, image, and text as basic elements have broad application prospects in many fields such as battlefield visual monitoring, environmental monitoring, security monitoring, traffic monitoring, smart home, and medical health. [0003] Wireless video stream monitoring is an important branch of multimedia wireless sensor network applications. The video stream information of the remote camera is transmitted to the server throug...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26H04N7/18H04N19/42
Inventor 邓志东徐朝农裴忠民
Owner TSINGHUA UNIV
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