3D interpolation using LUT very slow, alternative method

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Abdulllah 2019-4-16

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https://ww2.mathworks.cn/matlabcentral/answers/456659-3d-interpolation-using-lut-very-slow-alternative-method

编辑： Abdulllah 2019-4-16

Hello,

In image processing, converting XYZ(CIE 1931 XYZ space) to display RGB, We have created a LUT for our display. it is 3d cubic interpolation based and our results are correct. But the issue is that our code is extremly slow becasue it is pixel by pixel based. The function is such that

[rgbOut]=MyDisplayXYZ2RGB(NewXYZ, XYZlut,RGBlut);

where NewXYZ are XYZ value for which RGB are to be interpolated. XYZlut and RGBlut are the values which are used to interpolate using cubic interpolation method. We cacluate CIELAB DE and use it as criteria for the rgbOut.

Our image size is 4053x2050 and our LUT routine takes 2hours to complate because uses loop.

My question is that, if Matlab interp3 or some other function can interpolate like this? Will it be faster?

Can you please guide me how can I use interp3 for this data interpolation? Actually, I do not understand how can I input my LUTs in the interp3. Thank you.

Seoncd option for me, If, I hare my matlab code, can be fixed to take whole vector instead pixel?

Note:

NewXYZ is mx3 dimension

XYZlut [X Y Z] ] and RGBlut [R G B] are nx3 dimension

rgbOut must be mx3 dimension having R,G,B values

----Sample data

XYZlut=[ 0.085954  0.097486  0.13636 
19496  0.16676  0.62822 
30154  0.19816  1.3158 
68737  0.35471  3.4668 
5699  0.69064  8.4565 
052  1.2449  16.831 
2012  2.4245  34.592 
034  4.5791  67.462 
04  8.2393  123.88 
937  14.723  224.99];
RGBlut=[0	0	0
0	19
0	38
0	57
0	76
0	95
0	114
0	133
0	152
0	171] ;
NewXYZ=  [62.10263  66.39005  169.7117 
8211  82.24026  201.0852 
61543  78.18117  195.2129 
9406  76.70645  190.4692];

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KSSV 2019-4-16

My question is that, if Matlab interp3 or some other function can interpolate like this?

Very much possible...

Will it be faster?

Definetely it will be faster.

Abdulllah 2019-4-16

编辑：Abdulllah 2019-4-16

Thank KSSV for your reply. Actually I tried interp3 but I could not get success in using interp3. Can you please guide me how can I use interp3 for this data interpolation? Actually, I do not understand how can I input my LUTs in the interp3. Thank you.

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3D interpolation using LUT very slow, alternative method

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