How to display pixel values on the image and label on the region I want?

My project is want to enhance the hand vein image. The problem is I need to display some values on the vein. For example, pixel values, SNR and MSE. Below I attached the code to get the pixel values but I don't understand why the value have 3.

imshow 'hazirah.jpg';

pixel_values = impixel;

Answer 1

[Image Analyst]

You have 3 values because it's a color image. Those are the red, green, and blue intensity values.

rgbImage = imread('hazirah.jpg');
imshow(rgbImage);
impixelinfo; % Mouse around and see values.
row = 1; % whatever you want.
collumn = 4; % whatever you want.
pixel_values = impixel(rgbImage, row, column);

[Atifah Samuri]

how about the MSE and SNR values sir? Can i get the value to do the comparison between the original image with CLAHE image?

[Image Analyst]

There are built in functions psnr() and immse(). Try those.