Method and apparatus for real-time image data transmission

A data transmission method and image data technology, applied in the field of real-time image data transmission and devices, can solve the problems of wrong image data, image data loss, image and video quality degradation, etc., and achieve high compression signal-to-noise ratio and USB bandwidth utilization rate High, good visual subjective effect

Inactive Publication Date: 2008-11-05
BEIJING SIGMACHIP CO LTD
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Problems solved by technology

[0004] It is known that the communication rate of the USB interface can generally reach 12Mb / s in Full Speed ​​mode and 480Mb / s in High Speed ​​mode, which is completely sufficient in some data transmission applications, but in for example figure 1 When the real-time video image data of the USB camera shown is transmitted, the real-time compressed image data bit rate sometimes becomes very large, which will cause USB buffer overflow, resulting in image data loss, which is reflected on the host. Incorrect image data, dropped frames, etc., resulting in significant degradation of image and video quality

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  • Method and apparatus for real-time image data transmission
  • Method and apparatus for real-time image data transmission

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[0037] The image data transmission method and device of the present invention will be described in detail below with reference to the accompanying drawings.

[0038] figure 2 Shown is the structure diagram of the image data transmission device of the present invention, which is the same as figure 1 The difference in the structure diagram shown is that an image compression controller is added, which judges the size of the remaining capacity of the data buffer. If the calculation result shows that the remaining capacity of the data buffer is still large, it controls the image compressor according to the original The compression ratio format compresses the image block, and then transmits the compressed image block to the data buffer; when the calculation result shows that the remaining capacity of the data buffer is insufficient and may cause buffer overflow, it controls the image compressor according to the high The compression ratio format compresses image blocks, thereby con...

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Abstract

The invention discloses a data transmission method used in the image transmission system and a device, comprising: a device for real-time receiving the image data, wherein the device divides the received image data into a plurality of image blocks to real-time transmit to the host computer through a USB interface, also comprises a buffer area with the capacity MAXP, a buffer, an image compression controller and an image compressor. The image compression controller performs the computation according to the size of the residual capacity of the buffer, and controls the compression format algorism based on the computed result. The device and the method has the advantages of better image quality, high compression SNR, good vision subjective effect and high availability of the USB bandwidth.

Description

technical field [0001] The invention relates to an image data transmission method and device, in particular to a real-time data transmission method and device for preventing data buffer overflow during real-time transmission of USB interface image data. Background technique [0002] Now, the USB (Universal Serial Bus) interface has been widely used in peripheral devices, such as mouse, keyboard, storage device, etc., and the data transmission and communication between the device and the host are carried out through the USB interface device, and it is also applied to the video image of the camera. Data transfer in progress. [0003] figure 1 Shown is a system structure diagram of a conventional camera with a USB interface. Among them, the sensor in the camera captures the video image in real time and transmits it to the image processor through the sensor interface. Since the captured image data is usually large, it is necessary to compress the image data when using the USB ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/765H04N7/26H04N19/156H04N19/157H04N19/176H04N19/423
Inventor 张鸿林晖
Owner BEIJING SIGMACHIP CO LTD
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