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Image scaling method and device

A technology of image scaling and source image, which is applied in image data processing, graphics and image conversion, instruments, etc., and can solve the problems of image scaling method with large amount of calculation and low image quality

Active Publication Date: 2013-05-01
ZHANGJIAGANG KANGDE XIN OPTRONICS MATERIAL
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Problems solved by technology

[0007] The problem solved by the present invention is that the image scaling method in the prior art has a large amount of calculation, and at the same time the image quality is not high after scaling

Method used

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Embodiment Construction

[0086] The specific embodiment of the present invention provides an image scaling method and device, which uses a polyphase filter with symmetrical coefficients to scale the source image, and effectively reduces the number of multipliers in the actual scaling process while removing spectral aliasing and reflection images. The number of and the number of filter coefficients reduce the amount of calculation and storage. High-phase precision interpolation based on polyphase filtering results is used to effectively ensure the required phase precision and obtain high-quality zoomed images. By adopting adjustable initial phase values ​​for horizontal scaling and vertical scaling, conversion between different video image formats is satisfied.

[0087] In order to better illustrate the image scaling method in the specific embodiment of the present invention, the horizontal scaling and vertical scaling of images in YUV, YCrCb or HIS color space will be described in detail below in conj...

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Abstract

The invention discloses an image scaling method and an image scaling device. The image scaling method comprises the following steps of: acquiring coordinates, corresponding to the coordinates of the pixel point in a target image, of a virtual pixel point in a source image, wherein the coordinates are horizontal coordinates or vertical coordinates; acquiring pixel values of M actual pixel points in the direction of the coordinates of the virtual pixel point in the source image according to the coordinates of the virtual pixel point; acquiring a first pixel value and a second pixel value by utilizing a multi-phase filter and the M actual pixel points, wherein M is the number of tapes of the multi-phase filter; and performing linear interpolation on the first pixel value and the second pixelvalue to obtain a pixel value of the pixel point in the target image. The image scaling method and the image scaling device can effectively remove spectral aliasing or reflection mirror, meet the requirement on the conversion between different video image formats, reduce the number of multipliers and filters coefficients in an actual scaling process, and can obtain a high-quality scaled image.

Description

technical field [0001] The invention relates to the field of digital image processing, in particular to an image scaling method and device. Background technique [0002] With the rapid development of multimedia technology, there are more and more types of terminal video displays, and the resolution of the image output from the image source will be very different from the resolution of the image displayed on the terminal video display. In addition, users also have different requirements for the resolution of the images displayed on the terminal video display, so it is often necessary to scale the source images in the image processing system to generate target terminal device presents. For example, after a source image with an image resolution of 1920×1080 is scaled, it is presented on a terminal device that supports an image resolution of 1280×720. [0003] Digital images are discretized lattice data. To scale digital images, it is necessary to use known data and prior know...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T3/40
Inventor 钟声
Owner ZHANGJIAGANG KANGDE XIN OPTRONICS MATERIAL
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