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A real-time color image scaling method based on lanczos kernel

A color image and source image technology, applied in the field of image processing, can solve the problems of inappropriate real-time image scaling and high algorithm complexity, and achieve the effect of reducing algorithm complexity, ensuring image quality, and improving processing efficiency

Active Publication Date: 2016-07-06
NO 709 RES INST OF CHINA SHIPBUILDING IND CORP
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Problems solved by technology

The image quality generated by bicubic interpolation is better, but its algorithm complexity is high, which is not suitable for real-time image scaling

Method used

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  • A real-time color image scaling method based on lanczos kernel
  • A real-time color image scaling method based on lanczos kernel
  • A real-time color image scaling method based on lanczos kernel

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Embodiment Construction

[0032] root tree figure 1 As shown, a real-time color image scaling method solves the problem of high algorithm complexity and poor scaling quality in the traditional image scaling process. Its scheme adopts the following steps to realize:

[0033] Step 1, determine the horizontal and vertical scaling factors of the image and convert them to fixed-point decimals

[0034] The scaling factor calculation and fixed-point pseudocode can be described as: "S=((A-1)<<16) / (B-1)", where A is the width or height of the source image, and B is the width of the target image or height, S is the horizontal or vertical scaling factor; A, B and S are all 32-bit unsigned integer variables. The fixed-point processing of the zoom factor avoids the use of floating-point operations in the scanning process of the target image, and improves the scanning efficiency.

[0035] Step 2: Generate the horizontal pixel kernel lookup table of the target image based on the Lanczos kernel

[0036] 2.1). Cal...

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Abstract

The invention discloses a real-time color image scaling method based on the Lanczos kernel (a filter named after the Hungarian Cornelius Lanczos). Firstly, the scaling factor of the image is calculated, and then based on the Lanczos kernel, the calculated and generated applied to the entire target image Kernel lookup table, and finally scan the target image and perform nine-order interpolation filtering to realize real-time scaling of the color image. The invention can realize the decimal multiple scaling of the color image, and the accuracy can be achieved; the kernel lookup table generation technology based on the Lanczos kernel can minimize the kernel lookup table while ensuring the image quality; during the scanning process of the target image The generation of all pixels only involves fixed-point decimal operations, which avoids floating-point operations and improves processing efficiency.

Description

technical field [0001] The patent of the present invention belongs to the technical field of image processing, and specifically relates to a real-time color image scaling method. Background technique [0002] At present, there are many image scaling methods, most of which improve image quality, but sacrifice processing efficiency, and are difficult to apply to real-time image processing. The simplest method is the nearest neighbor method, which has the lowest computational complexity, but the jagged image after scaling is the most serious. Bilinear interpolation is a reasonable compromise between processing efficiency and image quality, but the image quality it generates is low, and the generation of each target pixel needs to recalculate the interpolation weight, which is low in efficiency. The image quality generated by bicubic interpolation is better, but its algorithm complexity is relatively high, which is not suitable for real-time image scaling. Contents of the inv...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T3/40
Inventor 郭莹张必银郭丽艳肖厚
Owner NO 709 RES INST OF CHINA SHIPBUILDING IND CORP
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