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Image zooming method and apparatus

An image zooming and zooming technology, which is applied in the direction of image communication, TV, color TV parts, etc., can solve the problems of degraded high-frequency part of the image, complex algorithm, easy to appear mosaic or jagged image, etc., to achieve smooth and good image Effects of Tracking Properties

Inactive Publication Date: 2010-03-24
SICHUAN PANOVASIC TECH
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Problems solved by technology

Nearest neighbor interpolation is the simplest interpolation algorithm, but the enlarged image is prone to mosaic or jagged phenomenon; bilinear interpolation (bilinear interpolation) greatly eliminates the jagged phenomenon, but it will degrade the high frequency of the image part, resulting in image blurring; Bicubic Interpolation algorithm (Bicubic Interpolation) is an improvement of bilinear interpolation, but the algorithm is more complicated, and the amount of parameter calculation

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  • Image zooming method and apparatus
  • Image zooming method and apparatus

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Embodiment Construction

[0019] The process of scaling the image is actually the process of resampling the image pixels. The original image pixels can be used as sampling points to construct an interpolation function, and the interpolation function is used to perform interpolation calculation on the resampling points required for zooming, to obtain the color values ​​of the resampling points, and then to obtain the corresponding zoomed image pixels. Image content is ever-changing and belongs to nonlinear function, so if you want to get a new image with better effect after interpolation, use an algebraic formula to achieve any ratio, any size, and any image zoom. You can use the idea of ​​​​segmentation function to segment according to the absolute value of the difference between two adjacent original pixel values, and use different algorithms for different segments:

[0020] First set the vertical or horizontal distance between two adjacent original pixels in the target image (zoomed image) to be 1, a...

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Abstract

The invention pertains to the digital image processing technology and provides a method and device for realizing the image scaling based on the principle of the filter and the guideline of the piecewise function. The method and device for the image scaling judge whether a differential value belongs to a low-frequency band, a medium-frequency band or a high-frequency band by determining the differential value of the pixel values of two adjacent original pixel points in an original image; different scaling algorithms are adopted to different frequency bands. When the differential value pertainsto the low-frequency band, the current interpolation point refers to the pixel values nearest to left / upper adjacent original pixel points and left / lower adjacent original pixel points; when the differential value pertains to the medium-frequency band, the pixel values of adjacent four original pixel points from left to right / from up to down are for reference; when the differential value pertainsto the high-frequency band, the pixel value of the current interpolation point is the one close to the original pixel points. The method and device of the invention have good tracking property to thewhole range of frequency domain of the image and the treated image is smooth with sharp edges and the hardware resource can be saved to have a simple circuit.

Description

technical field [0001] The invention belongs to digital image processing technology. Background technique [0002] Image scaling is an indispensable part of digital television, and how to ensure the visual effect of the enlarged image is particularly important. Commonly used enlargement algorithms include nearest neighbor interpolation, bilinear interpolation, and bicubic interpolation algorithms. Nearest neighbor interpolation is the simplest interpolation algorithm, but the enlarged image is prone to mosaic or jagged phenomenon; bilinear interpolation (bilinear interpolation) greatly eliminates the jagged phenomenon, but it will degrade the high frequency of the image part, resulting in image blurring; bicubic interpolation algorithm (Bicubic Interpolation) is an improvement of bilinear interpolation, but the algorithm is more complicated and the parameters are computationally intensive. [0003] Enlarging the original image is the process of image interpolation. Image r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/44
Inventor 韩大强金莹
Owner SICHUAN PANOVASIC TECH
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