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Image zooming method

An image scaling and image technology, which is applied in the field of image processing, can solve the problems that the image scaling technology is not very effective and cannot be well adapted to practical applications, etc., and achieve the effect of high quality, high sharpness and contrast of the zoomed image

Inactive Publication Date: 2010-06-30
SHANGHAI JIAO TONG UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

However, the effect of this image scaling technology is not very good, and there are different degrees of blur or block effect according to different scaling ratios, which cannot be well adapted to practical applications.

Method used

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Embodiment

[0026] The original image to be scaled in this embodiment, such as figure 1 As shown, the image is a grayscale image with a resolution of 128*128. To enlarge the original image to a new image with a resolution of 256*256, the following steps are included:

[0027] In the first step, each pixel is regarded as a rectangle, with the upper left corner of the original image M1 as the origin, the length direction and width direction of the pixel are respectively the x-axis and the y-axis to establish a rectangular coordinate system, according to the horizontal and vertical directions of the image Scaling, so that the central pixel of the original image coincides with the central pixel of the zoomed image, so as to obtain the position information of the pixel M of the zoomed image in the coordinate system.

[0028] The coordinate system established in this embodiment is as follows figure 2 As shown, where: the pixel point M is a square with a length of 1 / 4 and a width of 1 / 4, the c...

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Abstract

The invention discloses an image zooming method in the technical field of image processing, which includes the following steps: step 1, taking each pixel point as a rectangle and building a system of rectangular coordinates to obtain the position information of four top points of an image pixel point M after being zoomed in the system of rectangular coordinates; step 2, selecting N pixel points in an original image in the surrounding of the pixel point M, and obtaining the light distribution state of the pixel point M according to the position information and pixel value information of the N pixel points; step 3, obtaining the pixel value UM of the pixel point M according to the light distribution state and the position information of the pixel point M; and step 4, repeating step 1 to step 3, and respectively obtaining the position information and pixel value of each pixel point in the zoomed image, thereby obtaining the zoomed image. The image zooming method has high efficiency, does not have blooming to different zooming proportions, can keep higher acutance and contrast ratio, and does not have obvious block effect; moreover, the obtained zoomed image has high quality.

Description

technical field [0001] The present invention relates to a method in the technical field of image processing, in particular to an image scaling method. Background technique [0002] At present, there are many image scaling methods, the simplest is the neighborhood interpolation (nearest neighbor), which maintains a good high-frequency component, but the block effect is serious. In addition, the most commonly used methods are bilinear interpolation (bilinear) and bicubic spline interpolation (bicubic). Compared with neighborhood interpolation, the continuity of bilinear and bicubic has been greatly improved, but both are for high-frequency components The retention is not enough, there is a certain degree of ambiguity. The above technologies treat each pixel in the image as a sampling point, but when the CCD is sensitive to light, it is not a point, but a small rectangle, so the point pixel model that regards each pixel as a sampling point does not conform to The actual situa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T3/40
Inventor 戴辉张善文刘文江戎蒙恬刘涛
Owner SHANGHAI JIAO TONG UNIV
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