A Heat Map Generation Method Based on Parallel Acceleration
A heat map and hot spot technology, applied in 2D image generation, image data processing, instruments, etc., can solve the problems that the heat map analysis results are not suitable for practical applications, low algorithm efficiency, serious delay, etc., to achieve good heat map function, Excellent speed and high efficiency
Active Publication Date: 2017-11-07
CHINA NAT ELECTRONICS IMP & EXP CORP
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Problems solved by technology
Since these algorithms are all implemented in the CPU, the algorithm efficiency is low and the delay is serious when the input point data volume is large, the radius is large, and the screen resolution is large.
[0018] 2) The heat map analysis results are not suitable for practical application
These operations all involve traversal loop operations. If the operations are completed in the CPU, the time complexity is O(n) and O( w*h), seriously affecting performance
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[0054] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described below through specific embodiments and accompanying drawings.
[0055] The heat map generation method based on parallel acceleration provided in this embodiment, its step flow is as follows figure 1 As shown, it includes space-image coordinate conversion part 1, distance matrix generation part 2, GPU grayscale image generation part 3, GPU color map generation part 4, and GIS layer display part 5. The whole process is completed in the GPU, and finally Output a color heat map and display it on a GIS 2D map. in:
[0056] Space-image coordinate conversion part 1 is responsible for converting the spatial latitude and longitude coordinates (longitude, latitude) of the input disaster point into the two-dimensional image coordinates (x, y) of the output heat map image space;
[0057] The distance matrix generatio...
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The invention relates to a heat map generation method based on parallel acceleration, which uses parallel technology to perform related calculations for heat map generation, including the following steps: 1) calculating the influence factor distance matrix of the hot spot according to the influence radius of the hot spot input by the user; 2) Calculate the superimposed grayscale information of all hotspot influence ranges to generate a grayscale image of the heatmap; 3) calculate the mapped color image information according to the grayscale image to generate a color image of the heatmap; 4) output the colored heatmap and displayed to the user. The present invention uses GPU parallel technology to improve the traditional Heatmap algorithm for the first time, makes full use of the hardware acceleration capability, and cleverly combines Arcgis, Opengl and WPF drawing technologies, which can effectively improve the heat map generation efficiency, and has good practicability and intelligence. It can be applied to GIS, virtual reality, image processing, industry visualization and other fields.
Description
technical field [0001] The invention belongs to the field of image processing technology and heat map generation technology, and in particular relates to a heat map generation method based on parallel acceleration. Background technique [0002] Heat map, also called Heatmap, aggregates a large amount of data and uses a gradual color band to display it elegantly. The final effect is often better than the direct display of discrete points, and it can intuitively show the density or frequency of spatial data. . Heat maps have been used in many fields. For example, record the user's mouse click position in the Web page, display various spatial discrete point data, and so on. [0003] The heat map generation algorithm mainly includes the following four steps: [0004] 1) Set a radius for discrete points and create a buffer; [0005] 2) For the buffer of each discrete point, use progressive grayscale bands (complete grayscale bands are 0-255) to fill from inside to outside, fr...
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IPC IPC(8): G06T1/20G06T11/00
Inventor 李杨张大炜唐文杰
Owner CHINA NAT ELECTRONICS IMP & EXP CORP