Temperature lookup table

05142014, 03:43 AM
Post: #1




Temperature lookup table
In the SDK use's manual, page 64, it says that "the table translates absolute image pixels to temperature", and it also says than the table is 1dimensional array(the image pixels is 2dimensional array), so what is the progress between this translate？Thanks for answering me！


05152014, 04:58 AM
Post: #2




RE: Temperature lookup table
The table gives a correspondence between levels and temperature which can be expressed by the formula below.
Temperature (i,j) = LUT [Abs_pixel(i,j)] LUT is a just a function that applies to a pixel value. There is no possible confusion between the dimension of the lookup table, and the image dimension. Raphael. 

05152014, 12:46 PM
Post: #3




RE: Temperature lookup table
(05152014 04:58 AM)RDanjoux Wrote: The table gives a correspondence between levels and temperature which can be expressed by the formula below. Thank you very much! I realized that LUT is a projection, but didn't know how. Now I understand it clearly. But I have one more question and any comments you care to make would be more than welcome. We know that GetImage function returns the pixel values, in the SDK's samples, I can only get a Grey Scale Image through these pixel values, so how can I get the Pseudocolor Image? In other words, how can I build the color lookup table? 

05162014, 01:41 AM
Post: #4




RE: Temperature lookup table
In principle, you use the same kind of table of correspondence, except that the final result is a color.
You first define a range, Min_Temp and Max_Temp for instance, with a given number of colors, 256 for instance. Then, each temperature (rounded) between these two limits is represented by a color. Typically, these are based on Red Green Blue coefficients, each of them coded on 8 bits. Try change the font color in a PC application, and go to custom color. You should be able to see the color resulting from these different RGB coefficients. RDanjoux. 

05162014, 07:50 AM
Post: #5




RE: Temperature lookup table
(05162014 01:41 AM)RDanjoux Wrote: In principle, you use the same kind of table of correspondence, except that the final result is a color. Thank you very much! I'm working on it~~ 

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