What's the unit of homography found by FindHomography() function in mainSift.cpp

[narutojxl]

Hello author, Thanks for your sharing. I notice in mainSift.cpp, we can find the two images transform by FindHomography() and ImproveHomography() functions. I have 2 trival questions to seek your confirmation.

• 1) Does variable homography represents SE(2), namely, [R, t; 0, 1]= [H[0], H[1], H[2]; H[3], H[4], H[5]; H[6], H[7], H[8]]?
• 2) If it is correct, the translation part t = [H[2], H[5] ] unit is pixel, or m? The rotaion part unit is rad.

  https://github.com/Celebrandil/CudaSift/blob/5bc874af176224770da573eb0135b3494e553690/mainSift.cpp#L72-L78

Best regards narutojxl