Morphological valley operation (user specifies the connectivity of the structuring element - 4 or 8) [Default=8].

 

function call:

[out_img1]=vsg('Valley',in_img1,connected);

 

Arguments:

in_img1 mask image, 3 channel RGB, 1 channel greyscale or binary image, or DICOM image.

connected – an integer specifying whether 4 or 8 connected morphological operations.

 

Description:

The valley detector is the dual of the white Top-hat by opening. The valley detector is defined as BTH(A) = (A●K) – A; where is A is the input image, K is the structuring element and (●) is the closing operation. out_img1 – An image which has dimensions the same as the input image. This is the difference between the original image and the same image after being morphologically closed.

 

Example:

img = openimage('A.jpg');

h=figure;image(uint8(img));set(h,'Name','Input Image');

[img]=vsg('Threshold',img,100);

[out_img1]=vsg('Valley',img,8);

h=figure;image(uint8(out_img1));set(h,'Name','Valley');

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