I am working with Content based skin lesin image Retrieval .These images suffers from black frame artifacts.Attached,you will find an image example.
I remove the back frame by applying gemotric shape(cercle) on the image, and hence the number of pixels is reduced.
So, if i count the percentage of gray levels in the skin lesion, i will take the total number of pixels of the original image or the cropped images?
2. is there any effect on the other extracted features (texture features for instance) when i crop the original skin lesion image?
3. What is the difference betwwen the relative and absolute image features?
4. Is there better solution to remove the black frame without cropping the image?
Thank You
Khadidja BELATTAR
Best Regards.
Hi Antonious,
Thank you to repond me.
for the first answer, could you explain me more,please?
Concerning the 4 answer, there are also black pixels in the skin lesion, so i can't apply this solution.
Best Regards.
simply apply thresholding for black, convert each pixel below threshold to zero and minus the area of pixel having zero value from total image and remaining part will be area if interest ( Segmented). Apply the feature extraction to segmented image since background is having value zero whatever may be the value of feature will represent the value for segmented area. and total area can be calculated by calculating the no. of pixels of featured area divided by total number of pixels in segmented area.
Dear Khadidja Belattar,
chrome-extension://oemmndcbldboiebfnladdacbdfmadadm/http://www.isprs.org/proceedings/XXXI/congress/part3/297_XXXI-part3.pdf
Look the link. May be useful.
Best wishes, Shafagat
hi
you can remove the unwanted region using
1.simple threshold approaches
2. ostu threshold algorithm is the widely used one .
3.homogeneity has more influence highly homogeneous region called black region.
go with the size of image
like(in matlab)
[r,c]=size(inputimage)
for i=1:r
for j=1:c
if((inputimage(i,j)==0)
inputimage(i,j)=0;
else
inputimage(i,j)=inputimage(i,j);
Dear Chethankumar,
The code that you wrote, actually, i did not change the world!
Dear Chethankumar,
The code that you wrote, actually, i did not change the world!
Am I right?
Mohamed,
Yeah that is d simple code to apply threshold ....
did it helps you?
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