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Multiple thread stitching

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I use opencv to build a stitcher class to create a panorama image. The camera image in real time to produce multiple Thread to make the panorama image is an error to use a stitch function. The same error occurs when the graphics card is one haneungeot because of overlapping GPU is used. How do I use multiple threads in Stitch? Errors I got: OpenCV Error: Gpu API call (unspecified launch failure) in CudaFuncTable::copy, file D:\opencv\source\modules\dynamicuda\include\opencv2/dynamicuda/dynamicuda.hpp, line 882 OpenCV Error: Gpu API call (unspecified launch failure) in unknown function, ...matrix_operation.cu, line 143 OpenCV Error: Gpu API call (unspecified launch failure) in unknown function, ...surf.cu, line 140 OpenCV Error: Gpu API call (unspecified launch failure) in unknown function, ...surf.cu, line 691 OpenCV Error: Gpu API call (unspecified launch failure) in unknown function, ...surf.cu, line 112 OpenCV Error: Gpu API call (unspecified launch failure) in CudaFuncTable::mallocPitch, .... dynamicuda.hpp, line 1143

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