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Image scaling device and image scaling method

An image scaling and image technology, applied in image communication, image data processing, graphics and image conversion, etc., can solve the problems of increasing area overhead and unacceptable, and achieve the effect of reducing area cost, reducing the pressure of verification, and shortening the development cycle

Inactive Publication Date: 2008-05-14
SHANGHAI MAGIMA DIGITAL INFORMATION
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

If the display requirement is 3 windows or even more windows, then more linear buffers are needed, and the increased area overhead is unacceptable for the design

Method used

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  • Image scaling device and image scaling method
  • Image scaling device and image scaling method
  • Image scaling device and image scaling method

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Embodiment Construction

[0039] After horizontal scaling and vertical scaling of image data, the image data is usually output line by line, and the filtering of any pixel in vertical scaling needs to use several consecutive lines of pixel data on the same vertical line for filtering calculate. This requires setting up storage units for vertical scaling operations to cache pending data. In order to realize picture-in-picture (picture in picture; PIP) or picture by picture (picture by picture; PBP), it is often necessary to set multiple windows for the video image on the display device, so that the processing part of the image scaling is also correspondingly made a request. If a set of image scaling devices is prepared for image scaling of each window, the cost will increase. Especially in a single system-on-chip (system-on-chip), it has a greater impact on the area cost. The invention provides a single image scaling device to realize image scaling of multiple windows. It can be understood that the ...

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Abstract

The invention provides an image scaling device and an image scaling method. The device includes: a horizontal scaling unit used for scaling operation in a horizontal direction for an image, a vertical scaling unit used for scaling operation in a vertical direction for the image, a memory cell that is arranged between the horizontal scaling unit and the vertical scaling unit and is used for temporarily saving image data in a horizontally displaying row, and a filtering unit used for selecting data within a coordinate scope of each window according to the superposition condition of each window which displays the image. The method includes the following steps: image data is scaled horizontally; the data within the coordinate scope of each window is selected according to the superposition condition of each window which displays the image; selected data within the coordinate scope of each window is saved temporarily; and the image data which is scaled horizontally within the coordinate scope of each window is picked up to conduct vertical scaling.

Description

technical field [0001] The invention relates to an image zooming device and an image zooming method, in particular to an image zooming device and method that can be used to process multiple windows. Background technique [0002] In terrestrial, cable or satellite audio and video data transmission, audio and video decoders are generally installed at the receiving end to complete the decoding of audio and video data, and then the decoded data is converted from digital to analog and then played. After the received video stream is decoded, it usually goes through a post-processor (Video PostProcessor) before playing to complete some video post-processing work, such as image scaling, de-interlacing, gamma correction, etc. Post-processors can be integrated with the video decoder or configured separately. For the processing of image scaling, it is necessary to use DMA to move the video data from the memory, such as synchronous dynamic random access memory (SDRAM), to the post-proc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/44H04N5/262G06T3/40G09G5/395
Inventor 周振亚张亚林宋东海张磊
Owner SHANGHAI MAGIMA DIGITAL INFORMATION
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