questions about how to get Canon1DsMkIII DNG file for Canon1DsMkIII_0001 and how to calculate raw2xy matrix which in aug_data.json

[EmilySmile]

I have questions about how to get Canon1DsMkIII DNG file for Canon1DsMkIII_0001 in NUS dataset and how to calculate raw2xy matrix

(1) I download Canon1DsMkIII_RAW.zip from http://cvil.eecs.yorku.ca/projects/public_html/illuminant/illuminant.html
(2) Convert the CR2 raw file“Canon1DsMkIII_0001.CR2” from the Canon 1Ds Mark III camera to Adobe DNG files“Canon1DsMkIII_0001.dng” using the Adobe DNG Converter tool"AdobeDNGConverter_x64_17_1.exe ".
(3)Parse DNG info using exiftool-13.10_32.exe tool, and the details are attached inCanon1DsMkIII_0001.dng.txt,with some information listed below:
#Canon1DsMkIII_0001.dng.txt:
#WB RGGB Levels As Shot : 1950 1079 1079 2536
#Color Temp As Shot : 3592
#Forward Matrix 1 : 0.8098 0.0217 0.1328 0.4016 0.691 -0.0926 0.0599 -0.1224 0.8877
#Forward Matrix 2 : 0.8098 0.0217 0.1328 0.4016 0.691 -0.0926 0.0599 -0.1224 0.8877
#Color Matrix 1 : 0.6705 -0.1154 -0.0458 -0.6783 1.4191 0.2848 -0.0853 0.1159 0.749
#Color Matrix 2 : 0.5858 -0.0211 -0.093 -0.8254 1.6018 0.2354 -0.1732 0.1888 0.7448
(4) calculate raw2xy matrix C
alpha = (1/3203 - 1/2856) / (1/6504 - 1/2856) ‎ = 0.19315
C = alpha*Forward_Matrix_2 + (1-alpha)*Forward_Matrix_1
= 0.8098 0.0217 0.1328 0.4016 0.691 -0.0926 0.0599 -0.1224 0.8877
However C is different with raw2xyz matrix from aug_data.json, which is
"raw2xyz":[[0.83241191941326331,0.041206179758279705,0.12638190082845693],[0.40796173206444919,0.70410873223358483,-0.11207046429803423],[0.070831032429659255,-0.14754084311174423,1.0767098106820852]],

Could you provide me with some guidance? I look forward to your reply.

[mahmoudnafifi]

Unfortunately, I do not have access to the code that generated the augmented data to help with debugging the issue. Generally, one potential issue could be that, in the paper, I did not use the as shot CCT; instead, I computed it based on the ground-truth illuminant, as described in the supplementary materials.