Color segmentation by Delta E color difference

User draws region and this finds pixels in the image with a similar color, using Delta E.

Description

Demo to perform very, very simple color detection in LAB color space. The RGB image is converted to LAB color space and then the user draws some freehand-drawn irregularly shaped region to identify a color. The Delta E (the color difference in LAB color space) is then calculated for every pixel in the image between that pixel's color and the average LAB color of the drawn region. The user can then specify a number that says how close to that color would they like to be. The software will then find all pixels within that specified Delta E of the color of the drawn region.

• Required Products: Image Processing Toolbox
• MATLAB release: MATLAB 7.12 (R2011a)

[uvan siya]

Image Analyst >> Please send me the base paper for this "Color segmentation by Delta E color difference" . my mail is [e-mail]

[Image Analyst]

ajit, if there is a brightness change, there is a color change. If you want to detect a hue, regardless of it's brightness, then you can use my HSV color segmentation demo and just threshold on the hue value. However skin is a boomerang-shaped gamut and can't be gotten by any simple carving up of the gamut in any 3D color space, no matter which one you pick. You'd need to carve out the boomerang shape, not just a hue sector or a delta-E ball shape.

[ajit sarode]

works very accurate if said to choose any color however if there is brightness change for same color in rest of the picture than selected, then it does not detect(skin color with different brightness),can u please help?

Well commented/explained.

[Karthik Muthuswamy]

Works quite well. Well commented.
Can you add the reference to the paper or the math/theory behind this work?

[Anselm Griffin]

Well commented/explained.

[Image Analyst]

Marium: I don't recall getting anything from you.

[pratibha]

 

[Marium Malik]

Have messaged you the error

[Image Analyst]

arman: How did you run it? What was the exact error message? I just downloaded it and ran it, and it was fine. Click my name above and then click the "Contact Author" link to send me this information.

[arman Yaraee]

It doesn't work. Whenever I draw a region it gives error of too many output arguments!!

[Image Analyst]

You can use it for indexed images if you convert the indexed image into an RGB image with ind2rgb().

[dion]

can i use it for index image???