Three-dimensional block matching method in video noise-reduction treatment
A matching method and video noise reduction technology, applied in color TV parts, TV system parts, TV and other directions, can solve the problem of unpredictable search range of recursive two-dimensional block matching
Active Publication Date: 2011-07-27
SHANGHAI FULLHAN MICROELECTRONICS
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[0011] The technical problem to be solved by the present invention is to provide a method for three-dimensional block matching in video noise reduction processing, which can effectively improve the block efficiency of the current BM3D noise reduction algorithm based on recursive two-dimensional block matching in medium-intensity and high-intensity noise environments. Matching accuracy and noise reduction effect, and solve the problem that the search range of the current two-dimensional block matching based on recursion is unpredictable
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[0025] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0026] A method for three-dimensional block matching in video noise reduction processing provided by this embodiment includes the following steps:
[0027] Step 1: Divide the t-th by predetermined size 0 The video frame at the moment, the video standard here can be different, such as PAL and NTSC, and the pixel is the basic unit divided into several N 1 ×N 2 Two-dimensional pixel blocks, where the step between each block is SP;
[0028] Step 2, take a two-dimensional pixel block Such as figure 2 As shown in the two-dimensional pixel block Any coordinate in the area is the center, here take the coordinates of the upper left corner as the center to divide N σ ×N τ search domain for search field Each pixel in can construct a size N 1 ×N 2 Candidate 2D...
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The invention provides a three-dimensional block matching method in video noise-reduction treatment for solving the technical problem; the method comprises: the current two-dimensional block and a search domain of a certain frame in video sequence are respectively projected to the adjacent frame, the two-dimensional block is expanded into a three-dimensional block R3, and the two-dimensional search domain is expanded into a three-dimensional search domain. A plurality of three-dimensional candidate blocks are constructed in the three-dimensional search domain according to predetermined rules.The similarity of the three-dimensional candidate blocks S3 and the three-dimensional block R3 are calculated gradually, and the most similar NB three-dimensional blocks are selected. After the three-dimensional block is split into the two-dimensional blocks, and the N two-dimensional blocks most similar to the current two-dimensional block are selected finally. The method can effectively improvethe block matching precision and the video noise-reduction effect of existing two-dimensional block matching BM3D noise-reduction algorithm based on recursion and solves the problem that the existingtwo-dimensional block matching search domain based on recursion can not be foreseen.
Description
technical field [0001] The invention relates to video image noise reduction processing, in particular to a three-dimensional block matching method in video noise reduction processing. Background technique [0002] The BM3D algorithm is currently known as the highest performance general-purpose image / video noise reduction algorithm. It can use the autocorrelation characteristics of images and the temporal correlation of videos for effective noise reduction. BM3D is composed of three basic operation units: block matching, 3D noise reduction and collection, and can be operated with multiple iterations. The standard BM3D algorithm is two iterations. [0003] In the block matching step, BM3D in the current frame and before and after each N FR Search in frame with current 2D block x R similar block x m , and form similar blocks into a three-dimensional array The three-dimensional array generated during the matching process in the 3D noise reduction operation Do a 3D transfo...
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IPC IPC(8): H04N5/21
Inventor 董鹏宇诸悦程浩东
Owner SHANGHAI FULLHAN MICROELECTRONICS