Method realized based on hardware for real-time calculation of image plane projection points of spatial platform
A real-time computing and hardware-implemented technology, applied in the field of projection metrology, can solve the problems of reducing time overhead, inability to guarantee real-time calculation, large loss, etc., and achieve the effects of enhancing real-time performance, shortening processing cycle, and simplifying the number of calculations
Active Publication Date: 2017-07-04
HARBIN ENG UNIV
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Due to the influence of the curvature of the earth and data accuracy, the general projection coordinate solution process requires a lot of complex calculations and judgments, which undoubtedly consumes a lot of time for the hardware platform, so that the real-time performance of the calculation cannot be guaranteed. Therefore, we designed An algorithm suitable for hardware platforms - linear interpolation estimation algorithm, under the condition of ensuring a certain accuracy, greatly reduces the time overhead and achieves the effect of real-time calculation of projection point coordinates
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[0031] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0032] The invention provides a hardware-based method for real-time calculation of projection points of space platform image planes. Since the usual solution process needs to solve high-order equations and requires high data accuracy, if only DSP calculations cannot meet the real-time performance, and only FPGAs are used to complete the algorithm design, the design is difficult and the accuracy is difficult to guarantee. Therefore, we designed a method by The linear interpolation estimation algorithm of DSP and FPGA works together to complete the real-time calculation of projection points, which ensures the accuracy of data while ensuring real-time performance.
[0033] The complete processing system structural model of the present invention is as figure 1 As shown, the present invention includes an image acquisition module, a DSP pr...
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The invention provides a method realized based on hardware for real-time calculation of image plane projection points of a spatial platform. After a DSP receives internal and external direction element information of an image, segmentation is performed according to the current image dimension. Firstly, projection coordinates of centers of pixel blocks in a geocentric coordinate system are calculated according to a common calculating manner. Then a corresponding distance relation between pixels is established according to the calculated coordinates by means of a linear interpolation estimation method. Then the projection coordinates of all pixels are recovered through the distance relation by means of an FPGA. Finally the projection coordinates are transmitted to a memory. The method provided by the invention has advantages of preventing repeated large-scale calculation of the DSP, sufficiently utilizing data processing capability of the FPGA under a precondition that high data precision is ensured, and furthermore realizing real-time calculation.
Description
technical field [0001] The invention relates to a hardware-based real-time calculation method for image plane projection points of a space platform, belongs to the field of projection measurement, and is mainly used for calculating the projection coordinates of all pixel points in the entire image by hardware. Background technique [0002] In space platforms, systems with high-altitude image acquisition capabilities, such as aircraft and satellites, sometimes need to determine the one-to-one mapping relationship between image content and geographic location, that is, analyze the actual geographic coordinates of each pixel in the image. Positioning is a crucial step. Due to the influence of the curvature of the earth and data accuracy, the general projection coordinate solution process requires a lot of complex calculations and judgments, which undoubtedly consumes a lot of time for the hardware platform, so that the real-time performance of the calculation cannot be guarante...
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Login to View More IPC IPC(8): G06T1/20
CPCG06T1/20G06T2200/28
Inventor 郜丽鹏汲清波游世勋杜旭华
Owner HARBIN ENG UNIV