get the gradient of the image wiht sobel

Gradient\debug\Gradient.exe
........\.....\Gradient.ilk
........\.....\Gradient.pdb
........\.....\lena.jpg
........\.....\Microsoft.VC80.CRT.manifest
........\.....\Microsoft.VC80.DebugCRT.manifest
........\.....\opencv_core231.dll
........\.....\opencv_highgui231.dll
........\Gradient\Debug\BuildLog.htm
........\........\.....\Gradent.exe.embed.manifest
........\........\.....\Gradent.exe.embed.manifest.res
........\........\.....\Gradent.exe.intermediate.manifest
........\........\.....\Gradient.exe.embed.manifest
........\........\.....\Gradient.exe.embed.manifest.res
........\........\.....\Gradient.exe.intermediate.manifest
........\........\.....\main.obj
........\........\.....\mt.dep
........\........\.....\vc80.idb
........\........\.....\vc80.pdb
........\........\Gradient.vcproj
........\........\Gradient.vcproj.0151-01014.Administrator.user
........\........\highgui.h
........\........\lena.jpg
........\........\main.cpp
........\........\opencv\cv.h
........\........\......\cv.hpp
........\........\......\cvaux.h
........\........\......\cvaux.hpp
........\........\......\cvwimage.h
........\........\......\cxcore.h
........\........\......\cxcore.hpp
........\........\......\cxeigen.hpp
........\........\......\cxmisc.h
........\........\......\highgui.h
........\........\......\ml.h
........\........\......2\calib3d\calib3d.hpp
........\........\.......\.ontrib\contrib.hpp
........\........\.......\.......\retina.hpp
........\........\.......\..re\core.hpp
........\........\.......\....\core_c.h
........\........\.......\....\eigen.hpp
........\........\.......\....\internal.hpp
........\........\.......\....\mat.hpp
........\........\.......\....\operations.hpp
........\........\.......\....\types_c.h
........\........\.......\....\version.hpp
........\........\.......\....\wimage.hpp
........\........\.......\features2d\features2d.hpp
........\........\.......\.lann\allocator.h
........\........\.......\.....\all_indices.h
........\........\.......\.....\any.h
........\........\.......\.....\autotuned_index.h
........\........\.......\.....\composite_index.h
........\........\.......\.....\config.h
........\........\.......\.....\defines.h
........\........\.......\.....\dist.h
........\........\.......\.....\dummy.h
........\........\.......\.....\dynamic_bitset.h
........\........\.......\.....\flann.hpp
........\........\.......\.....\flann_base.hpp
........\........\.......\.....\general.h
........\........\.......\.....\ground_truth.h
........\........\.......\.....\hdf5.h
........\........\.......\.....\heap.h
........\........\.......\.....\hierarchical_clustering_index.h
........\........\.......\.....\index_testing.h
........\........\.......\.....\kdtree_index.h
........\........\.......\.....\kdtree_single_index.h
........\........\.......\.....\kmeans_index.h
........\........\.......\.....\linear_index.h
........\........\.......\.....\logger.h
........\........\.......\.....\lsh_index.h
........\........\.......\.....\lsh_table.h
........\........\.......\.....\matrix.h
........\........\.......\.....\miniflann.hpp
........\........\.......\.....\nn_index.h
........\........\.......\.....\object_factory.h
........\........\.......\.....\params.h
........\........\.......\.....\random.h
........\........\.......\.....\result_set.h
........\........\.......\.....\sampling.h
........\........\.......\.....\saving.h
........\........\.......\.....\simplex_downhill.h
........\........\.......\.....\timer.h
........\........\.......\gpu\devmem2d.hpp
........\........\.......\...\gpu.hpp
........\........\.......\...\gpumat.hpp
........\........\.......\...\matrix_operations.hpp
........\........\.......\...\NCV.hpp
........\........\.......\...\NPP_staging.hpp
........\........\.......\...\stream_accessor.hpp
........\........\.......\highgui\highgui.hpp
........\........\.......\.......\highgui_c.h
........\........\.......\imgproc\imgproc.hpp
........\........\.......\.......\imgproc_c.h
........\........\.......\.......\types_c.h
........\........\.......\legacy\blobtrack.hpp
........\...

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