Non-linear image zooming method and system

Abstract

The invention provides a nonlinear image scaling method and a nonlinear image scaling system, comprising: a space position computation module for an interpolation point in the vertical direction which is provided and used for determining an exact interpolation position of a current point being reflected to the vertical direction of the prior image; a scaling factor which is provided and used by the computation module for computing the scaling factor k, and a space position computation module for the interpolation point in the horizontal direction which is provided and used for computing a position in the horizontal direction according to different positions of various points in the prior image and by adoption of segmented nonlinear means; an interpolating module which is provided and used for implementing interpolation according to computed results by the segmented nonlinear means. The method and the system of the invention adopt segmented nonlinear scaling, thereby aspect ratio of the prior image can be maintained by an intermediate important section; moreover, a left borderland and a right borderland adopt scaling factors with different scales, thereby no great distortion exists when an image is converted onto a target screen with different aspect ratios, and the invention is particularly suitable for playing video programs.

Description

technical field [0001] The invention relates to the field of digital image processing, in particular to a nonlinear image scaling method and system. Background technique [0002] In a flat-panel TV, since the input image and the output image to be displayed have different pixels per line and the number of lines per frame, SCALER is needed for spatial scaling. [0003] In addition, a large number of image scaling algorithms have been designed in the prior art. Chinese patent application No. 03111801.1 discloses a digital image scaling integrated circuit design method, in which the upward scaling and downward scaling are realized by a single circuit; Chinese patent application No. 200410102696.5 also discloses a method for image scaling, which reduces the complexity of the algorithm by establishing a lookup table for scaling. However, all of the above methods have a common feature, that is, they all adopt linear scaling methods without considering nonlinear scaling, which wil...

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Problems solved by technology

The patent is applicable to the electronic program guide screen, so that the program list can be proportionally wider than the original screen, effectively using the space on the target screen, but, because the proportion of the middle area is distorted, the method is not suitable for application to video programs During playback, because the scale factors on the left and right of the car line are abrupt, and the middle area is the area that human eyes pay

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