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A Real-Time Weighted Median Filtering Method Based on Bilateral Grid

A weighted median and bilateral technology, applied in image data processing, instrumentation, computing, etc., can solve problems such as graphics card hardware implementation, and achieve the effect of a significant structural boundary

Active Publication Date: 2017-08-15
WENZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method reduces the time complexity to O(r), the algorithm is highly serial in nature and therefore cannot be implemented directly on graphics card hardware

Method used

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  • A Real-Time Weighted Median Filtering Method Based on Bilateral Grid
  • A Real-Time Weighted Median Filtering Method Based on Bilateral Grid
  • A Real-Time Weighted Median Filtering Method Based on Bilateral Grid

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Embodiment Construction

[0028]The present invention will be further described by the following examples in conjunction with the schematic flow chart.

[0029] The present invention will be described in detail below in conjunction with the accompanying drawings: the real-time weighted median filter method based on bilateral grids; this embodiment is implemented on the premise of the technical solution of the present invention, and combines detailed implementation methods and processes, but this embodiment The scope of protection of the invention is not limited to the following examples.

[0030] Such as figure 1 As shown, the bilateral grid-based real-time weighted median filtering method described in this embodiment includes the following five steps:

[0031] (1) A two-dimensional image is given as the input image I, and an image of the same size as the input image is given as the boundary image E. The width and height of the image are recorded as w and h respectively, then x∈{0,1,2,....,w-1}, y∈{0...

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Abstract

The invention provides a real-time weighted median filtering method based on bilateral grids. This method can be briefly summarized as the following five steps: the user is given an input image and a boundary image; a four-dimensional bilateral network with four coordinate axes (u, v, z, a) is constructed based on the input image and boundary image. grid; according to the constructed four-dimensional bilateral grid, perform Gaussian filtering operations along the three coordinate axes of u, v, and z to obtain a smooth weighted bilateral grid; according to the smoothed weighted bilateral grid, along the a coordinate axis Perform an accumulation operation to obtain the accumulated three-dimensional histogram. According to the accumulated three-dimensional histogram and based on the linear interpolation method, the final weighted median filtered output image is obtained. Benefiting from the advantages of the bilateral grid, the method of the present invention can maintain good edge information while smoothing the image. Each step of the method of the present invention can be processed in parallel in the graphics card hardware, effectively improving the running speed.

Description

technical field [0001] The invention relates to a weighted median filtering method, in particular to a method for performing real-time weighted median filtering based on a four-dimensional bilateral grid. Background technique [0002] The task of boundary-preserving image smoothing filter is to remove the noise information contained in the image while maintaining the salient structure information on the image as well as possible. At present, many boundary-preserving image smoothing filters have been proposed. The bilateral filtering method is a boundary-preserving filtering method that is simple to implement and widely used. The image filtering operation is performed by calculating the weighted sum of pixel values ​​in the local neighborhood of the image. To a certain extent, the structural boundary of the image will be blurred (see Tomasi C, Manduchi R. Bilateral filtering for gray and color images. Proceedings of IEEE International Conference on Computer Vision, IEEE Comp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00
CPCG06T2207/20192G06T2207/20032G06T5/70
Inventor 赵汉理高丹丹
Owner WENZHOU UNIV
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