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Image reduction method and device

An image reduction and image technology, applied in the field of image processing

Inactive Publication Date: 2012-11-28
GUANGDONG VTRON TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] Based on this, it is necessary to provide an image reduction method and device for avoiding jagged images after image reduction and improving image quality.

Method used

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  • Image reduction method and device

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Embodiment Construction

[0019] Various embodiments of the image reduction method and device of the present invention will be described in detail below.

[0020] Firstly, the image reduction method is described.

[0021] see figure 1 , is a schematic flow chart of an embodiment of the image reduction method of the present invention, including steps:

[0022] Step S101: Acquiring the reduction ratio, judging whether the reduction ratio is greater than the preset threshold, if yes, proceed to step S102, if not, then the reduction ratio is the ratio factor, and directly proceed to step S103;

[0023] Step S102: using the formula n 1 *n 2 …n i =N decomposes the reduction magnification and determines the magnification factor. In the formula, i represents the number of times of image reduction processing, n j (1≤j≤i) represents the factor of the j-th time, and n j ≤ the first preset threshold;

[0024] Step S103: During the first image reduction process, the original image is sampled, and the samplin...

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Abstract

The invention discloses an image reduction method, which comprises the following steps: obtaining a reduction ratio, and decomposing the reduction ratio and determining a ratio factor for reduction so that the ratio factor is smaller than or equal to the preset threshold if the reduction ratio is greater than a preset threshold; sampling an image, and determining a reference pixel matrix; determining the pixel value of each point through a B-spline curved-surface function according to the reference pixel matrix, and reducing the image; and judging whether remaining ratio factors exist, returning to sample the image if yes, and no processing is conducted if no. According to the invention, the ratio factor is controlled to be within the range of preset values by decomposing the ratio factor; and the B-spline curved-surface function is adopted to determine the pixel values, so as to avoid zigzags after image reduction and guarantee the integrity of the reduced image.

Description

technical field [0001] The invention relates to the field of image processing, in particular to an image reduction method and device. Background technique [0002] Image reduction, that is, using a small number of pixels to represent the original image, will inevitably lead to the loss of image information. The key to image reduction is to use a small number of pixels to reflect the original image relatively completely. A certain pixel in the reduced image should be a comprehensive representation of multiple pixels in the original image. Therefore, a certain point in the reduced image should be mapped according to a certain proportional relationship, and should correspond to a certain sub-block of the original image, and with the difference of the scaling ratio, the size of the corresponding image sub-block of the point in the original image will also be different. Not the same. [0003] Traditionally, the nearest neighbor sampling method calculates the floating-point coor...

Claims

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Application Information

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IPC IPC(8): G06T3/40
Inventor 杨锦彬
Owner GUANGDONG VTRON TECH CO LTD
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