The image is from a leaf, I want to find the discontinuous points ,which is because of the bugbite. How can I find these points as fast as I can？

[Image Analyst]

Where are the discontinuities?

[yinghui zhu]

[yinghui zhu]

thanks for your questions。I just forget to mark the points.Maybe I make a misunderstand here.The insects bite the leaves to make the boundaries discontinue with the orignal boundaries.So I want to find these points.

[Mark Sherstan]

Analyze the x and y values you plotted instead of using image processing.If you want to use image processing post the original image.

[yinghui zhu]

Answer 1

[Image Analyst]

You can take the convex hull of the image. Then subtract (use xor function) the initial leaf mask. The difference could be where the bugs have eaten away, assuming the leaves are convex. If you don't know how, then post your original image and the code you used to segment it to a binary image mask.

[yinghui zhu]

Thanks.I have tried this way.But it is useless ,when the leaf boundaries is jaggedly.

[yinghui zhu]

[yinghui zhu]

and it is also useless,when the leaf has some sunk part which maybe similar with bugholes.

Answer 2

[Image Analyst]

Try the attached script. At least it's a start. Adapt as needed.

[yinghui zhu]

Thanks a lot .But as you can see,the simple smooth analysis will make lot of mistakes ,such as the petiole.

[Image Analyst]

I don't know what that is but the algorithm doesn't know if a little incursion/notch in the outline is normal or due to being eaten by an insect. There is no expert knowledge programmed into this simple algorithm.

I suggest you employ the expert knowledge of your user and have them use ginput() to click on regions that you want to remove because they're normal and not an eaten region. Something like

(x, y) = ginput(1); % User clicks on blob to remove.
row = round(y);
column = round(x);
blobLabel = labeledImage(row, column) % Find ID # of blob.
labeledImage(labeledImage == blobLabel) = 0; % Erase that blob.

You can put this into a loop where you ask the user if they need to remove a blob, or accept all existing blobs and continue onwards.