Simply， based on opencv，a rgb image is converted to a grayscale image.

grating
.......\Debug
.......\.....\grating.exe
.......\.....\grating.ilk
.......\.....\grating.pdb
.......\grating
.......\.......\Debug
.......\.......\.....\CL.read.1.tlog
.......\.......\.....\CL.write.1.tlog
.......\.......\.....\grating.lastbuildstate
.......\.......\.....\grating.log
.......\.......\.....\grating.obj
.......\.......\.....\gray.obj
.......\.......\.....\link-cvtres.read.1.tlog
.......\.......\.....\link-cvtres.write.1.tlog
.......\.......\.....\link-rc.read.1.tlog
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.......\.......\.....\link.4156.read.1.tlog
.......\.......\.....\link.4156.write.1.tlog
.......\.......\.....\link.5140-cvtres.read.1.tlog
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.......\.......\.....\link.5140.write.1.tlog
.......\.......\.....\link.5156-cvtres.read.1.tlog
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.......\.......\.....\link.5156-rc.read.1.tlog
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.......\.......\.....\link.5156.read.1.tlog
.......\.......\.....\link.5156.write.1.tlog
.......\.......\.....\link.5468-cvtres.read.1.tlog
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.......\.......\.....\link.5468-rc.read.1.tlog
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.......\.......\.....\link.5468.read.1.tlog
.......\.......\.....\link.5468.write.1.tlog
.......\.......\.....\link.5948-cvtres.read.1.tlog
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.......\.......\.....\link.5948-rc.read.1.tlog
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.......\.......\.....\link.5948.read.1.tlog
.......\.......\.....\link.5948.write.1.tlog
.......\.......\.....\link.read.1.tlog
.......\.......\.....\link.write.1.tlog
.......\.......\.....\stdafx.obj
.......\.......\.....\vc110.idb
.......\.......\.....\vc110.pdb
.......\.......\Gray_Image.jpg
.......\.......\ReadMe.txt
.......\.......\grating.vcxproj
.......\.......\grating.vcxproj.filters
.......\.......\gray.cpp
.......\.......\image1.jpg
.......\.......\image2.jpg
.......\.......\image3.jpg
.......\.......\image4.jpg
.......\.......\stdafx.cpp
.......\.......\stdafx.h
.......\.......\targetver.h
.......\grating.sdf
.......\grating.sln
.......\grating.v11.suo

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