Lookup table for 2D matrix

Let say i have large matrix (data) of size 103680x10 uint8 which stores value range of 0-255.

And lookup Table (LUT) is 256x255 double, i want to replace each element in data matrix with row vector of LUT.

In current i do this with following code : result = LUT(data'+1,:);

But it took 0.8 second to do this one operation, Can it be faster i have to do this for all frames in my video?

I really appreciate any help you can provide.

[Walter Roberson]

To confirm: you want the output result to be 10 * 103680 * 255 elements in size? Just under 256 megabytes ?

If so then I suspect it is unlikely that you could get better performance -- well, except for small tuning like constructing data to be 10 x 103680 instead of 103680 x 10 so that you can skip the transpose. Oh, and using .' might be marginally faster than ' but not much.

[manit chansuparp]

Yes, Mr.Walter the result i get is 1036800 * 255. I ever tried the both case data 103680 x 10 and dataTranspose 10 x 103680(without ' ), it give me a same time(0.8 sec).

Maybe i'm going to deal with some LUT function such as intlut. it can replaces each element much faster than "result = LUT(data'+1); " when LUT is array of size 256. It took only 0.005 sec while LUT(data'+1) took 0.1 sec. Unfortunately, intlut supports only array not matrix. I have to find any other solution about LUT function.

[Walter Roberson]

maybe loop doing 255 intlut, one for each column of your LUT ?