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Image transfer method and apparatus based on USB mode

A transmission method and image sensor technology, applied in the field of image processing, can solve the problems of multiple CPU resources, consume large hardware resources, increase chip area, etc., and achieve the effects of small CPU resource occupation, good image quality, and reduced area

Inactive Publication Date: 2009-12-30
BEIJING SUPERPIX MICRO TECHNOLOGY CO LTD
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Problems solved by technology

Although this implementation scheme can transmit at a higher frame rate and display with better image quality, there are corresponding defects. The specific defects are: in the process of JPEG compression, relatively large hardware resources need to be consumed, increasing The area of ​​the chip is increased, and the cost is increased; in addition, JPEG decompression requires a relatively large amount of computation, which will occupy more CPU resources, thereby affecting the processing efficiency of the entire system

Method used

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  • Image transfer method and apparatus based on USB mode
  • Image transfer method and apparatus based on USB mode
  • Image transfer method and apparatus based on USB mode

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Embodiment Construction

[0038] The present invention is to solve the problem that the image transmission rate is relatively slow in the USB1.1 mode, and to perform down-sampling and compression processing on the input image format size of the VGA image, under the premise of ensuring image quality and transmission rate, as much as possible reduce the cost of the chip.

[0039] The digital image processor involved in the present invention includes: some general image processing modules such as preprocessing module, interpolation module, automatic exposure control, automatic white balance, Gamma correction, color space transformation, contrast enhancement, color correction; In addition, the image processor It also includes a USB2.0 bus module and a USB1.1 bus module for image data transmission. In order to ensure the image data transmission of the USB1.1 mode, the present invention sets a mode based on USB1.1 in the digital image processor. The image data processing module is a functional module for pro...

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Abstract

The invention relates to an image transmission method and device based on USB mode. The invention is used to allow a digital image processor to convey the image data sent from an image sensor to a host-side based on USB1.1 mode, the concrete procedures are that: at first, the image sensor sends the collected image data to the digital image processor according to the preset line length, the image data is processed by the digital image processor, the line length is determined according to the transmission rate of the USB1.1 mode; then the digital image processor makes a transformation processing to the processed image data, and sends to the host-side after the image data is transformed into an image format matched with the image size supported by the host-side. So the operand of the realization scheme provided by the invention has less CPU resource occupation than JPEG decompression on the host-side, which ensures that the invention can effectively decrease the area of the chip and reduce the realization cost of the chip.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to an implementation scheme of image transmission based on USB mode. Background technique [0002] With the rapid development of digital camera technology and the increasing maturity of network video technology, more and more PC Cameras (computer cameras) are widely used in video chatting and other aspects. The core processing chip of the PCCamera is an image processing chip with a USB module, and the USB module provides a corresponding USB interface through which image data can be transmitted. [0003] The USB interface for image transmission currently includes two transmission modes, USB1.1 and USB2.0. That is, as a general-purpose image processing chip, it should be compatible with both USB1.1 and USB2.0 image transmission methods. Since the USB2.0 protocol itself is downwardly compatible with the USB1.1 transmission mode, if the USB module of the image processing chip...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F3/14
Inventor 贡青袁红星江明
Owner BEIJING SUPERPIX MICRO TECHNOLOGY CO LTD
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