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Adjustable rectangular window image scaling method and device

A technology of image zooming and rectangular window, which is applied in the direction of cathode ray tube indicators, instruments, static indicators, etc., can solve the problems of edge jaggedness, low cost, and complex hardware implementation, so as to save cache units, reduce zooming time, and improve The effect of scaling efficiency

Inactive Publication Date: 2013-10-16
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, bilinear interpolation and nearest neighbor interpolation are the most used algorithms in the chip. Their hardware implementation is simple and the cost is low, but using them for scaling will produce more obvious edge aliasing.
The cubic interpolation algorithms such as bicubic interpolation and Mitchell interpolation can better restore the original information of the image, but the hardware implementation is complicated due to the calculation involving the cubic

Method used

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  • Adjustable rectangular window image scaling method and device
  • Adjustable rectangular window image scaling method and device
  • Adjustable rectangular window image scaling method and device

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Experimental program
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Effect test

Embodiment 1

[0038] Embodiment 1: a method for zooming an adjustable rectangular window image, characterized in that the image includes a plurality of pixels, and the pixels are arranged in a two-dimensional matrix, with rows in the horizontal direction and columns in the vertical direction, and each pixel A point is regarded as a pixel block with a certain width and height, and the operation steps are as follows:

[0039] 1) Obtain the row and column positions of the vertices of the target pixel block to be sought in the source image;

[0040] 2) Obtain the position and size of the adjustable rectangular window where the target pixel block is located during the scaling process, that is, obtain the adjustable scaling parameters;

[0041] 3) According to the size and the position of the above-mentioned adjustable rectangular window, obtain the position and the pixel value of the source pixel block needed when calculating the target pixel block;

[0042] 4) According to the position and pix...

Embodiment 2

[0044] Embodiment two: the present embodiment is basically the same as embodiment one, and special feature is as follows: described step 1) obtains the method for the row, column position that the apex of the target pixel block to be sought is located in the source image is: the source The image and the target image are regarded as two two-dimensional images of equal size, and they are overlapped and placed in the same rectangular coordinate plane, so as to calculate the row and column positions of the vertices of the target pixel block in the source image.

[0045] The step 2) obtains the size of the adjustable rectangular window in the scaling process, that is, the method for obtaining adjustable scaling parameters is:

[0046] Determine the size of the adjustable rectangular window according to the setting of the initial zoom mode of the system or the setting of the upper computer.

[0047] The method for obtaining the position of the source pixel block and its correspondin...

Embodiment 3

[0053]Embodiment three: this embodiment is also basically the same as embodiment one, and the more specific situation and working principle are as follows: this embodiment is based on the four source pixel values ​​covered by the adjustable rectangular window where the target pixel is to be sought and the sum of the products of the area coverage ratios occupied by the four pixels in the rectangular window. Due to the adjustable parameters of the rectangular window, the zoomed target image can have different display effects between soft and sharp, and because the source pixels closer to the target pixel occupy a greater weight, the zoomed target image The pixel can maintain the maximum characteristics of the original pixel.

[0054] Such as figure 1 As shown, it is the overlapping view of the source image and the target image of this adjustable rectangular window image scaling method, including the following parameters:

[0055] The resolution of the source image: the number ...

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Abstract

The invention relates to an adjustable rectangular window image scaling method and a device. The method comprises the following steps: acquiring the position and the size of a target pixel block in an adjustable rectangular window in the process of scaling by acquiring positions of the peak of the target pixel block to be acquired in the row and column in which a source image are positioned; further acquiring the position and the pixel value of a source pixel block needed for calculating the target pixel block; and finally acquiring the target pixel value to be solved according to the acquired positions of the peak of the target pixel block to be acquired in the row and column in which the source image is positioned and the position and the pixel value of the source pixel block. The device comprises an input and receiving module, an input FIFO buffering module, a column pre-scaling module, a pre-buffering module, a row scaling module, an output buffering module, an output timing sequence generation module and a parameter calculating and controlling module. The invention has the characteristics of easy realization of hardware, low resource expenses, quick operating rate, adjustable display effect after the scaling and the like. The device for digital image scaling realized on the basis of the method in the invention is the best solving scheme applied to the field of display consumption.

Description

technical field [0001] The invention relates to a scaling method and device in the field of digital image processing, in particular to an adjustable rectangular window image scaling and device. Background technique [0002] The optimal resolution of the increasingly popular flat-panel display is fixed, and it needs to convert image signal sources of different resolutions into images consistent with its resolution. Such a process is called image scaling (scaling), and the image scaling device ( Scaler) is the image processing module to complete this work. As the core part of the flat panel display system, it can provide a reliable image scaling device and image enhancement processing for the display screen to meet the needs of different users and different application environments. In the image scaling device, an interpolation method is mainly used to realize the function of image scaling. At present, bilinear interpolation and nearest neighbor interpolation are the most us...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/20G09G5/373
Inventor 冉峰计慧杰陈章进徐美华孔敏达薛盛凯
Owner SHANGHAI UNIV
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