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Projection-onto-convex-sets image reconstruction method based on SURF matching and edge detection

An edge detection and convex set projection technology, applied in image enhancement, image data processing, instruments, etc., can solve edge blurring and other problems, achieve the effect of suppressing edge oscillation, improving real-time and robustness, and solving edge oscillation

Inactive Publication Date: 2015-01-28
BEIHANG UNIV
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AI Technical Summary

Problems solved by technology

[0005] The present invention proposes an improvement on the blurring of edges and the limitations of matching when using the traditional POCS algorithm to reconstruct high-resolution images

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  • Projection-onto-convex-sets image reconstruction method based on SURF matching and edge detection
  • Projection-onto-convex-sets image reconstruction method based on SURF matching and edge detection
  • Projection-onto-convex-sets image reconstruction method based on SURF matching and edge detection

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Embodiment Construction

[0047] The overall implementation process of the POCS super-resolution image reconstruction algorithm for improving image edge quality and motion estimation disclosed by the present invention is as follows:

[0048] Step 1. Acquisition of low-resolution image observation sequence:

[0049] a. The simulation experiment images are degraded for Cameraman (complex background), Lena and Boat (more details). Use a 5×5 Gaussian low-pass filter with a standard deviation of 3 as a blurring operator to blur the image, and then add Gaussian white noise with a mean value of 0 and a variance of 0.001 to the image to generate a degraded image, and then pass The affine transformation performs a series of translation and rotation on the degraded image, and the transformation parameters are randomly selected from the range of translation X and Y directions (0-30, 0-30) pixels, and rotation angle (0-10) degrees. Set the downsampling factor to 2, the simulation generates as figure 2 The seque...

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Abstract

The invention discloses a projection-onto-convex-sets (POCS) image reconstruction method based on SURF matching and edge detection. To solve the problems of fuzzy edge and matching limitation in a traditional POCS super-resolution image reconstruction algorithm, 0-degree, 45-degree, 90-degree and 135-degree edges around a pixel are detected by a second-order gradient first. A gradient-based interpolation algorithm is adopted in reference frame construction, linear interpolation is carried out along the edge direction, and weighted interpolation based on first-order gradient is carried out along the non-edge direction. A SURF matching algorithm is adopted in motion estimation to improve the robustness and real-time performance of matching. In reference frame correction, the point spread functions (PSF) of the center in the four edge directions are defined. A simulated experiment and a real experiment are respectively assessed by using full-reference image quality assessment and no-reference image quality assessment. The method obviously improves the quality of reconstructed images and improves the robustness and real-time performance of matching.

Description

technical field [0001] The present invention relates to a convex set projection image reconstruction method based on SURF matching and edge detection, which is a method for obtaining satisfactory high-resolution images through software algorithms under the premise of using existing imaging equipment. Aerial photos, medical image processing, satellite remote sensing imaging and other fields have a wide range of applications, and belong to the field of image processing enhancement technology. Background technique [0002] Nowadays, digital cameras are becoming more and more popular, and an important index to measure their performance is the resolution. Obtaining high-resolution images is of great value. High-resolution X-ray films, CT images, and MRI images allow doctors to accurately locate the lesion and improve the accuracy of diagnosis; high-resolution satellite cloud images can improve the accuracy of weather forecasts; high-resolution resource satellite photos , can pro...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00
Inventor 王睿梁玉
Owner BEIHANG UNIV
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