Method and device for zooming image

Abstract

The invention discloses an image zooming method and device. The method comprises: a pre-generated zooming coefficient table is loaded and the zooming coefficient table comprises discrete coefficient values respectively corresponding to a plurality of reduction times and the discrete coefficient values respectively corresponding to a plurality of magnification times; the original resolution rate is received and a zooming times ratio required by the present zooming is satisfied; according to the zooming times ratio, the zooming coefficient table is searched and the stepping length as well as the coefficient value corresponding to the zooming times ratio are determined; by utilizing the determined stepping length, rows or columns of the original pixel which participates in each zooming are controlled, the pixel value of the original pixel in the rows or columns of the original pixel which participates in the zooming is multiply-accumulated with the determined coefficient value, the zoomed rows or columns are obtained, and the zooming is finished until the present image is determined according to the original resolution rate.

Description

technical field [0001] The invention relates to digital image technology, in particular to a method and device for scaling an image. Background technique [0002] In video applications, due to various image sources and various terminals displaying these image sources at the same time, there is often a large gap between the resolution of the image output from the image source and the resolution of the image received and displayed by the terminal. difference. In addition, users also have different requirements on the resolution of images displayed on terminals. In this way, in image processing systems such as video gateways, multi-screen synthesizers, and terminal adapters, it is often necessary to reduce or enlarge the resolution of the image. For example, the resolution of the image output from the image source is higher than that received and displayed by the terminal. If the resolution of the image is small, then, in image processing systems such as video gateways, multi...

AI Technical Summary

Problems solved by technology

[0006] 1. At present, the scaling algorithm is fixed in hardware chips such as ASIC chips, and the hardware chip can only provide a unique scaling factor. For example, the hardware chip can only perform 3 times magnification processing, and cannot perform other multiple magnification processing. Therefore, various scaling requirements cannot be met

[0007] 2. Asymmetric zoom function

The asymmetry of the zoom function is mainly due to the fact that the existing chip adopts different architectures and algorithms for zooming out and zooming in. Since the two are not processed uniformly, either only the function of zooming in the image is provided, or the function of zooming in the image is only provided, which greatly reduces the Flexibility of business realization

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