I want to find earth mover's distance for two histograms.How do I do that?

I have two images and I have find out the rgb channel of both the images.Now I need to find out the earth mover's distance between red,green and blue channels for both the images consecutively.How do I do that?

Answer 1

[José-Luis]

Google is your friend

[Prachi Sharma]

I Googled it already couldn't get the idea for the code.

[José-Luis]

How does the linked file-exchange contribution not work for you? According to the description, it does exactly what you asked for. Have you tried it?

[Prachi Sharma]

It is quite confusing

[José-Luis]

What is confusing? The code?

Have you actually downloaded and tried to use the file-exchange contribution?

If yes, how is it confusing?

It is very difficult to help you without a specific question.

If you failed to see the link, I'll try to make it obvious.

-------> click here <----------

[Prachi Sharma]

The part of the code mentioned below confuses me.I mean what do I need to give in the input arguments.Sorry but I am new to image processing so not really that good at it.

% EMD   Earth Mover's Distance between two signatures
%    [X, FVAL] = EMD(F1, F2, W1, W2, FUNC) is the Earth Mover's Distance
%    between two signatures S1 = {F1, W1} and S2 = {F2, W2}. F1 and F2
%    consists of feature vectors which describe S1 and S2, respectively.
%    Weights of these features are stored in W1 and W2. FUNC is a function
%    which computes the ground distance between two feature vectors.

[Image Analyst]

Try to contact the code author, or the authors of the paper that they cited. We didn't write the code, or read the paper, and can't help you understand it.

Please post your image. Is it just an arbitrary RGB image, or is it a color or black and white image of a handwritten signature?

[Prachi Sharma]

1blue2pink-it is the original image perfblueup-is the upper part take out from the image perfpinkright-is the right part taken out from the image mid-is the intersection of the two color pens screenshot-shows vertically-histograms of rgb channels of blue cropped part,then histograms of rgb channels of pink cropped part then lastly histograms of rgb channels of mid(intersection of two pens).

[Ernest Woei]

If I recall correctly, for this particular function,

F1 is a vector referring to locations, while W1 refers to the weights at each location. For example, suppose locations are in 3D and we have 3 points,

F1 = [1 2 3;
      10 11 12;
      20 20 20]

W1 = [1/4;
      1/2;
      1/4]

which means point (1, 2, 3) has 1/4 weight, (10, 11, 12) has 1/2 weight, and (20, 20, 20) has 1/4 weight.

In your case for images. For example, image 1, channel R. Using R's histogram where this histogram has bins, and each bin has an associated center, then you have the necessary pieces for F1 and W1.

Finally FUNC is a reference function that helps you compute distances between say 3D points or bin centers.