Help me how to convert RGB image to YUV

I heard that there is a built in function in matlab that came with the image processing toolbox that convert RGB image to YUV can you help me to do that ?

Answer 1

[Walter Roberson]

See http://www.mathworks.com/matlabcentral/answers/27055

Also see the MATLAB File Exchange

[James]

ok thanks but how can i change back yuv2rgb back again

[Walter Roberson]

Just solve the simultaneous equations. You will get

R = -0.1179838438e-4 * U + Y + 1.139834576 * V
G = -.5805942338 * V -.3946460533 * U + 1.000003946 * Y
B = .9999796789 * Y + 2.032111938 * U -0.1511298066e-4 * V

[James]

ok thanks alot

Answer 2

[Image Analyst]

No. There is one to LUV, not YUV. You can get the relationship between L and Y at easyRGB. You can find the formulas to go from sRGB to YUV at Wikipedia, but why do you want to use that anyway? Why not use YCbCr, or even better, HSI or LAB? What are you trying to do? Can you upload your image somewhere and tell us? How do you know book formulas are going to work for you and you don't need to use calibrated intensity units? Are you sure your RGB is sRGB? (The answer is no, you do not. For example the x-rite Color Checker Chart comes with a list of nominal RGB values for the standard color chips but you will never be able to get those with your camera unless you're extremely lucky with your sensor spectral sensitivities and your exposure.)

[James]

i am testing one algorithm that enhance the contrast. actually the algorithm is tested on sRGB format but i dont have any idea how to convert RGB to sRGB and what the different between the two format

I reach a point where i decided to change RGB to YUV or YcBcr so that i play only on the Y matrix

It works for me but i still want to learn about image formats

I am into digital image processing and i want to be an expert