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Patent

Single image defocus blur estimation algorithm based on multi-scale gradient difference

10 May 2017-
TL;DR: In this article, a single image defocus blur estimation algorithm based on multi-scale gradient difference was proposed, which can effectively restrain the ambiguity of fuzzy texture and a high-precision defocus map can be obtained for defocus blurred images of different scene types.
Abstract: The invention discloses a single image defocus blur estimation algorithm based on multi-scale gradient difference, comprising the following steps: S1, carrying out edge location defocus blur estimation; and S2, filtering and interpolating a sparse defocus map to get a full-defocus map. Compared with the prior art, the defocus value at each pixel of an image can be calculated accurately, the defocus estimation algorithm can effectively restrain the ambiguity of fuzzy texture, and a high-precision defocus map can be obtained for defocus blurred images of different scene types.
Citations
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Patent
07 Nov 2017
TL;DR: In this paper, an effective image quality evaluation system consisting of an image acquisition module, an image processing module, a feature extraction module and an image quality evaluator is presented.
Abstract: An effective image quality evaluation system includes an image acquisition module, an image processing module, a feature extraction module and an image quality evaluation module, wherein the image acquisition module is configured to acquire image data of an original image to be evaluated, the image processing module is configured to process the acquired original image to obtain a reference image, the feature extraction module is configured to extract image features of a grayscale image X and the reference image Y, and the image quality evaluation module is configured to comprehensively evaluate the image quality according to the image featured obtained by the feature extraction module. The beneficial effects of the present invention are as follows: a fuzzy copy is obtained as a reference image by performing low-pass filtering on the acquired original image, and the image quality is evaluated by extracting the image features between the original image and the reference image, the calculation process is relatively simple and a better evaluation result is obtained.

2 citations

References
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Patent
12 Sep 2012
TL;DR: In this paper, a defocus depth estimation and full focus image acquisition method of a dynamic scene is proposed, which comprises the following steps of: acquiring first depth maps and globally inconsistent fuzzy kernels of a plurality of defocused images, and employing an image deblurring algorithm based on defocus estimation to carry out feedback iterative optimization to obtain a full-focus image and a second depth map of each moment.
Abstract: The invention provides a defocus depth estimation and full focus image acquisition method of a dynamic scene. The method comprises the following steps of: acquiring first depth maps and globally inconsistent fuzzy kernels of a plurality of defocused images, and employing an image deblurring algorithm based on defocus depth estimation to carry out feedback iterative optimization to obtain a full focus image and a second depth map of each moment; after carrying out color segmentation on the full focus image of each moment, and carrying out plane fitting on the depth map, and carrying out refinement of space to obtain a third depth map, and carrying out optimization again to obtain an optimized full focus image; after carrying out optical flow estimation on the full focus image, carrying out smoothing on the third depth map, refining the third depth map in the time to obtain a depth estimation result with a consistent time. According to the method, a more precise dynamic scene depth estimation result and a full clear image can be obtained, and realization is easy.

15 citations

Patent
05 Apr 2005
TL;DR: In this article, a phase modulation device comprising a plurality of unit areas which are arranged in a certain period and which mutually have substantially the same pattern, and an optical image forming system disposed between the phase modulation devices and the non-single-crystal semiconductor film is presented.
Abstract: A crystallization apparatus of the present invention irradiates a non-single-crystal semiconductor film with a luminous flux having a predetermined light intensity distribution to crystallize the film, and comprises a phase modulation device comprising a plurality of unit areas which are arranged in a certain period and which mutually have substantially the same pattern, and an optical image forming system disposed between the phase modulation device and the non-single-crystal semiconductor film. The unit area of the phase modulation device has a reference face having a certain phase, a first area disposed in the vicinity of a center of each unit area and having a first phase difference with respect to the reference face, and a second area disposed in the vicinity of the first area and having substantially the same phase difference as that of the first phase difference with respect to the reference face.

9 citations