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Method and device for sampling digital image

A digital image and sampling device technology, applied in the direction of standard conversion, etc., can solve problems such as large hardware requirements, information loss, and inability to interpret

Inactive Publication Date: 2007-05-30
REALTEK SEMICON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Because no matter what kind of down-sampling, the information will be lost, and it is impossible to retain the complete original image information; and the purpose of down-sampling is to obtain the display content under such circumstances. The information of the image is equivalent; therefore, the precise interpolation method is not necessarily meaningful to the user; and the simple interpolation method (1 / 2 accuracy) only sacrifices the image quality to save the multiplier, and the hardware requirement is still large; but The discarding method is unacceptable, because the truly meaningful information may be discarded and cannot be interpreted

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Embodiment Construction

[0031] The method and device for continuous digital image down-sampling of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0032] FIG. 4 is a schematic diagram of a digital image down-sampling device according to the present invention. As shown in the figure, the continuous digital image down-sampling device 40 of the present invention includes a first-in-first-out data buffer (FIFO) 41 and its down-sampling calculation control circuit 42 . The reading control logic of the control circuit 42 in the continuous digital image down-sampling device 40 of the present invention is to generate the required writing of the data buffer register 41 according to the image zoom ratio, the picture position of the pixel and the picture number to enable ( Write Enable (WE) signal to write the digital image pixel data into the data buffer 41. The pixel data read out from the data buffer 41 is the result of the continuous digital image do...

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Abstract

This invention puts forward a digital image reducing frequency sampling device and its method using process on time shaft to reduce complexity of operation and device structure and solve the problem of fuzzy effect resulted in reducing frequency sampling and part of the image information lost to reach the aim of digital image reducing frequency sampling.

Description

technical field [0001] The invention relates to a method and device for down-sampling of digital images, especially a method and device for down-sampling by processing on the time axis. Background technique [0002] In a digital image system, the conversion of the picture format must be achieved by corresponding conversion of the digital image data to the sampling frequency. For example, enlarging an image frame of 800×600 pixels to 1024×768 pixels is equivalent to up-sampling the image data in two dimensions, horizontal and vertical. Conversely, if you want to reduce the image frame of 1024×768 pixels to 800×600 pixels, it is equivalent to down-sampling. [0003] There are two commonly used methods for reducing the size of an image, the discarding method and the interpolation method. The practice of discarding is to directly use the pixel closest to the down-sampling position in the original image frame as the result of down-sampling. The interpolation method is to use l...

Claims

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Application Information

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IPC IPC(8): H04N7/01
Inventor 龚金盛陈思平
Owner REALTEK SEMICON CORP