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Window added interpolation method for Sinc function in image scaling device

An image scaling and interpolation technology, applied in image data processing, graphics and image conversion, instruments, etc., can solve the problems of small zooming range, low efficiency, and no development, and achieve large image zooming range, good image quality, convenience and Accurately get the effect

Inactive Publication Date: 2008-10-01
NANJING UNIV
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Problems solved by technology

However, when the commonly used interpolation method realizes the zoom transformation of graphics, there is a small zoom range, and there are problems of large amount of calculation and low efficiency when obtaining high-quality zoomed images.
At present, most of the image scaling processing adopts common methods, and no new algorithm in this area has been developed in China.

Method used

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  • Window added interpolation method for Sinc function in image scaling device
  • Window added interpolation method for Sinc function in image scaling device
  • Window added interpolation method for Sinc function in image scaling device

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Embodiment Construction

[0027] The selection of interpolation methods for image scaling generally includes nearest neighbor interpolation, bilinear interpolation, cubic convolution and so on. The invention adopts the method of Sinc function plus Kaiser window, and sets parameters according to the characteristics of the image to be zoomed. Make this interpolation method into a subroutine that can be called directly, and apply it in the graphics zooming process, set the Kaiser window parameters and the Sinc function parameters according to the zoomed image shape characteristics and the zoom ratio in the image zooming process, and perform the processing on the image to be processed. Interpolation processing to obtain the scaled image. The present invention is applied in a system using FPGA as a core image processing component of a projector, and flexibly sets correction parameters according to image features to be zoomed, and can realize a large-angle correction range and high-quality correction images....

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Abstract

An interpolation selecting method of image pantograph includes using a weighting sequence to make amplitude be attenuated slowly to be zero near two ends of filter, naming this weighting sequence as window, calculating out cut-off frequency and transition bandwidth of filter according to image character of image to be contracted and enlarged then calculating out beta parameter of Kaiser window and length parameter N of window as well as parameter of Sinc function.

Description

1. Technical field [0001] The invention relates to an important method of image zooming and transformation processing—the selection method of image zooming interpolation, especially the Sine function window interpolation method in the image zoomer. 2. Background technology [0002] There are many selection methods for image scaling, the most commonly used are bilinear interpolation, cubic convolution and nearest neighbor interpolation. However, the commonly used interpolation method has the problems of small zoom range when realizing the zoom transformation of graphics, large amount of calculation and low efficiency when obtaining high-quality zoomed images. Most of the image scaling processes now use common methods, and no new algorithms in this area have been developed in China. 3. Contents of the invention [0003] The object of the present invention is to provide a method for zooming an image, so that when zooming an image, especially irregular zooming, a zoomed image...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T3/40
Inventor 沈庆宏曹凤莲都思丹田敏雄高敦堂
Owner NANJING UNIV
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