|
Super Resolution Restoration Based on Modified Point Spread Function
WANG Linlin, ZHAO Yan, WANG Shigang
Journal of Jilin University(Information Science Ed. 2017, 35 (1):
1-7.
DOI: A
Because the traditional super resolution restoration algorithm edge preserving ability is insufficient and the ringing effect, we propose the projection on convex sets super resolution restoration algorithm based on modified point spread function. First detect the edge of the reference image; Then, modify the traditional point spread function using a weight factor, and the point spread function is divided into the eight directions of 0°,22. 5°,45°,67. 5°,90°,112. 5°,135°,157. 5°, to achieve the effect of reducing the range of point spread function in the edge section; Finally, modify the reference frame iteratively using the improved point spread function, until the error between the estimated gray value and the actual gray value is small to a certain range or the set iteration number has been reached; Exit iteration and get super-resolution restoration image. The quality of restored image is evaluated by the peak signal to noise ratio, mean square error and structural similarity. Experiment results indicate that the peak signal to noise ratio of the two types of test images is improved by3. 46 ~6. 91 dB, the mean square error is reduced by 43. 47 ~87. 82, and the structural similarity is improved by 0. 050 8 ~0. 381 7. It is concluded that the proposed algorithm improves the edge preserving ability of super resolution reconstruction, and improves the quality of the restored image.
Related Articles |
Metrics
|