Need help coding pixel values for an image

I am working on an experiemnt where we take IR images with a contour scale and then take those images to matlab to assign tempertaure values for each pixel from the given scale.

This is how it was explained to me, how could i put this into a code:

• take the length of the scale and read the picture in matlab and output it back into matlab
• Image Is a set of pixels in different colors- a matrix of values/numbers. Take the number of pixels and divide them linearly between the two extremes (given on the bottom of the images) and create a linear scale.
• Take a pixel and read that pixel and find its grade scale RGB value in matlab. Go across each pixel and put it into a loop.
• For every pixel read the value and see where it falls and do a linear interpolation. Come up with the temperature of each pixel.

Answer 1

[Rijuta]

Hi Molly,

I understand that you want to code pixel values for an image. To implement the described process in MATLAB, you can follow these steps:

1. Read the image into MATLAB using the `imread` function.

2. Determine the length of the contour scale and calculate the temperature range per pixel. If the scale has `n` divisions and the temperature range is from `T_min` to `T_max`, the temperature range will be given by temperature_range = (T_max - T_min) / n.

3. Extract the RGB values of a pixel in the grade scale. You can use the `impixel` function to interactively select a pixel and obtain its RGB value.

4. Define a loop to iterate over each pixel in the image and calculate the corresponding temperature

5. The resulting will contain the calculated temperature values for each pixel in the original image.

I hope these steps help you achieve the required results. Please refer to the links below for related documentation:

Read image from graphics file - MATLAB imread (mathworks.com)

Pixel color values - MATLAB impixel (mathworks.com)

Answer 2

[DGM]

See the following examples:

https://www.mathworks.com/matlabcentral/answers/1923970-background-color-correction-of-a-rgb-picture#answer_1193820

https://www.mathworks.com/matlabcentral/answers/1933530-hi-i-have-a-set-of-data-which-is-temperatures-in-degree-celsius-ranging-from-10-deg-to-250-deg-but-i#answer_1200784

https://www.mathworks.com/matlabcentral/answers/1841838-adjust-the-color-bar-of-all-thermal-images-to-be-consistent

https://www.mathworks.com/matlabcentral/answers/1938509-i-have-some-thermal-images-and-i-need-to-find-the-maximum-temperature-each-images-and-locate-that-pi