How to filter objects based on size using"bwareafilt()" ?

 I want to remove only lung area shown in the image using function "bwareafilt"

The following code gives me error Undefined function 'bwareafilt' for input arguments of type 'double'.

fi=fopen('JPCLN001.img','r','b');

img=fread(fi,[2048 2048],'*uint16','b');

img1=mat2gray(img, [0,4096]);

img2=imrotate(img1,-90);

img2=flip(img2,2); %Horizantal Flip

%subplot(1,2,1);

figure,imshow(img2),title('Original');

img3=imcomplement(img2);

%subplot(1,2,2);

figure,imshow(img3),title('negative');

medf=medfilt2(img3,[3 3]);

%subplot(1,2,1);

figure,imshow(medf),title('Med_filtered');

img4=imadjust(medf);

%subplot(1,2,2);

figure,imshow(img4),title('Contrast1');

img5=histeq(img4);

%subplot(1,2,1);

figure,imshow(img5),title('Hist_Equa');

%level = graythresh(img5);

B = im2bw(img5,0.45);

figure,imshow(B);

%B1=logical(B);

BW2 = bwareafilt(B,2);

figure,imshow(BW2)

Answer 1

[KAE]

It sounds like you do not have the Image Processing Toolbox, which includes the function bwareafilt.

Answer 2

[Image Analyst]

You have the Image Processing Toolbox (otherwise imrotate would not have worked), but you have an antique version older than R2014b which is when bwareafilt() was introduced. Upgrade to the latest version or use bwareaopen() as an alternative.

By the way, your initial segmentation is really bad.

[Saptadeepa Kalita]

I am working on RVG dental xray. My aim is to detect the type of dental caries present. The problem i m facing is with the selecting region of interest from the xray( the only tooth which is affected). I would be glad if anyone can suggest me the way.

Answer 3

[Mrutyunjaya Hiremath]

in your code, there is a code part as show below

img3=imcomplement(img2);

don't use that.

code works fine in 2014b.

Here, ROI part is Lung only.

[Saptadeepa Kalita]

I am working on RVG dental xray. My aim is to detect the type of dental caries present. The problem i m facing is with the selecting region of interest from the xray( the only tooth which is affected). I would be glad if anyone can suggest me the way.