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Image scaling method

An image scaling and source image technology, which is applied in graphics and image conversion, image data processing, instruments, etc., can solve the problem of large cache capacity consumption, and achieve the effects of saving line cache, good image zoom effect, and reducing cache consumption

Inactive Publication Date: 2011-07-20
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

The image transition obtained by median filtering and bilinear interpolation is smooth, and the image is relatively delicate, but it consumes more cache capacity

Method used

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Embodiment Construction

[0012] The essence of the present invention is to improve the combination of bilinear interpolation (Bilinear interpolation) algorithm and median filtering algorithm. Firstly, the principles of the two methods are introduced.

[0013] The bilinear interpolation algorithm is a relatively good image scaling algorithm, which makes full use of the four real pixel values ​​around the virtual point in the source image to jointly determine a pixel value in the target image, so the scaling effect is better than Simple nearest neighbor interpolation is much better. figure 1 It is a schematic diagram of the principle of biquadratic linear interpolation. After scaling according to a certain ratio, the gray value P of point P is calculated by formula (1) new (x,y):

[0014] P 0 = ( 1 - Δx ...

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Abstract

The invention provides an image scaling method which uses a linear algorithm during horizontal scaling and an improved median algorithm during vertical scaling. The image scaling method not only retains the image effect of a bilinear interpolation algorithm, but also saves the row cache. Tests prove that cache consumption can be reduced by at least 25 percent.

Description

technical field [0001] The invention belongs to the technical field of digital image processing and video screen display, and in particular relates to an image scaling method. Background technique [0002] Image scaling is one of the most important technologies in digital image processing. Image scaling realizes the conversion of images from the original resolution to the physical resolution of the display screen. Since image information is described by a pixel matrix, the essence of image scaling is to convert pixels The matrix is ​​transformed. [0003] Commonly used image scaling algorithms include nearest neighbor method, median filter and bilinear interpolation. The nearest neighbor method is simple and fast, but the zoomed image is rough with jagged edges. The transition of the image obtained by median filtering and bilinear interpolation is smooth, and the image is relatively delicate, but it consumes more buffer capacity. Contents of the invention [0004] The i...

Claims

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Application Information

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IPC IPC(8): G06T3/40
Inventor 尹盛沈悦江博张渊
Owner HUAZHONG UNIV OF SCI & TECH
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