Piecewise linear interpolation method applied to video image amplification

A piecewise linear interpolation, video image technology, applied in image data processing, graphics and image conversion, instruments, etc., can solve the problems of complex algorithms, unclear edges of bicubic interpolation, and high hardware consumption.

Inactive Publication Date: 2013-10-23
TIANJIN UNIV
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Problems solved by technology

However, due to the complexity of the algorithm, the consumption of hardware is also large
At the same time, because it is also a linear interpolation method, bicubic interpolation also has a certain degree of unclear edges

Method used

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  • Piecewise linear interpolation method applied to video image amplification
  • Piecewise linear interpolation method applied to video image amplification
  • Piecewise linear interpolation method applied to video image amplification

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Embodiment Construction

[0071] The image enlargement algorithm proposed by the present invention is based on bilinear interpolation, but the interpolation point is calculated according to the situation, that is, according to the difference between the gray levels of two adjacent sources, correspondingly different interpolation curves are selected for calculation. Thus, to a certain extent, the effect of retaining the edge information of the image is achieved, so that the effect of the zoomed image is better than that of the general interpolation algorithm. When the selection of the curve is reasonable and the hardware calculation accuracy is high, the result can be very close to the actual value, and the overall calculation amount of the algorithm is not large, and the hardware implementation consumes less resources.

[0072] The calculation of each interpolation point includes both horizontal and vertical directions, and the gray levels of the four adjacent source pixels need to be weighted. Such as...

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Abstract

The invention relates to the field of digital image processing and provides an image amplification algorithm which can still keep the edge of an image clear after the image is amplified in a large scale, has a low calculated amount and is convenient for hardware implementation. The invention adopts the technical scheme that a piecewise linear interpolation method applied to video image amplification comprises the following steps of calculating each interpolating point in both horizontal and vertical directions; carrying out weighting on gray levels of four adjacent source pixel points; firstly, carrying out weighting calculation on two source pixels at the upper part and two source pixels at the lower part according to horizontal distances from the source pixels to the interpolating points so as to obtain two middle pixel points; and then carrying out weighting calculation on the two middle pixel points according to vertical distances from the two middle pixel points to the interpolating points so as to obtain gray levels of the interpolating points to be calculated, wherein when the interpolating points are calculated, processing is carried out according to conditions, i.e. according to difference between the gray levels of two adjacent sources, corresponding different interpolation curves are selected to carry out calculation. The piecewise linear interpolation method is mainly applied to digital image processing.

Description

technical field [0001] The invention relates to the field of digital image processing, in particular to a segmented linear interpolation method applied to video image enlargement. technical background [0002] Digital image scaling is one of the key technologies in digital image processing and the basis of other digital image processing. The efficiency of image scaling algorithms and the quality of images after scaling are crucial to the entire system. [0003] Image interpolation is the use of known pixels in the surrounding area to generate the value of unknown pixels in the target image, thereby reproducing an image with a higher resolution from the original image. The value of the pixel in the new image is obtained by projecting this point to the source image (the projected point is the interpolation point), and weighted by the values ​​of neighboring pixel points around the projected point in the source image. [0004] According to whether image edge information is use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T3/40
Inventor 史再峰庞科姚素英徐江涛高静刘江明
Owner TIANJIN UNIV
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