A fast multi-resolution scheduling display method for large-scale remote sensing images
A remote sensing image and multi-resolution technology, applied in image analysis, image enhancement, graphics and image conversion, etc., can solve the problem of increasing device memory consumption, unable to guarantee stable memory usage, stable picture loading speed, and large differences in the number of tiles, etc. problem, to achieve the effect of ensuring memory usage, improving loading and display efficiency, and ensuring normal work
Active Publication Date: 2021-11-12
SOUTHEAST UNIV
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However, there are the following problems in the actual display process: 1. If the size of the loaded tile is slightly smaller than the screen size, it is affected by the position of the viewpoint and the tile division method, and the number of tiles to be loaded by different viewpoints varies greatly
For mobile devices with limited memory resources, the stability of memory usage and image loading speed cannot be guaranteed
2. If the size of the loaded tile is much larger than the screen size, it will also increase the memory consumption of the device and slow down the display speed of the image
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[0028] The key technologies and specific implementation methods in the present invention will be described in detail below in conjunction with the drawings and specific embodiments.
[0029] Such as figure 1 As shown, the large-scale remote sensing image fast multi-resolution display scheduling method of the present invention includes the following steps:
[0030] Step 1: Process the original image to generate an image pyramid. The specific steps are as follows:
[0031] (1.1) L is the number of layers of the image pyramid, and the size of the original image is M×N, which is the 0th layer of the image pyramid. Divide layer 0 into 4 L block tile, the tile size is m 0 ×n 0 ,in
[0032] (1.2) Sampling the original image of layer 0, combining 4 adjacent tiles into one tile, and combining every 4 pixels in the tile into one pixel. After the sampling is completed, it is the first layer of the image pyramid. The size of the first layer of the image pyramid is still M×N, and ...
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The invention discloses a method for fast multi-resolution scheduling and displaying of large-scale remote sensing images, which includes the following contents: calculating the number of layers of the image pyramid corresponding to the optimal resolution, mapping the tiles of this layer to the screen space, and judging the length of the tiles Whether the height is greater than the length and height of the screen, if it is the best size, call the current best resolution tile layer display; when at least one of the length and height of the tile is less than the length and height of the screen space: if the screen is loaded at the same time If the number of tiles does not exceed 4, no adjustment will be made; if the number of tiles loaded is greater than 4, then search for low-resolution but larger tiles from the upper layer of the image pyramid until the tiles of a certain layer of the image pyramid are mapped to After the screen space, the length and height are greater than the length and height of the screen space, stop searching, and call the tiles of this layer for display. The invention can reduce system memory overhead, increase image loading speed, and control the number of tiles loaded on the screen to no more than four, thereby ensuring the stability of memory usage.
Description
technical field [0001] The invention relates to geographical information and cloud computing technology, in particular to a method for fast multi-resolution scheduling and displaying of large-scale remote sensing images. Background technique [0002] High-resolution large-scale images often have a very large amount of data, which can reach the GB level. Displaying it directly will take up a lot of memory resources, and the loading time is long and the operation speed is slow. A common display method for this type of image data is to process the original data, create an image pyramid tile file, and load the corresponding tile according to the position of the viewpoint during the display process for display. However, there are the following problems in the actual display process: 1. If the size of the loaded tile is slightly smaller than the screen size, it is affected by the position of the viewpoint and the tile division method, and the number of tiles to be loaded by diffe...
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IPC IPC(8): G06F16/957G06T3/40G06T17/05
CPCG06T3/4092G06T2207/10032G06T2207/20016
Inventor 张小国丁丁邵俊杰郑冰清叶绯
Owner SOUTHEAST UNIV