how to get an accurate image

Hi, im problem to get an accurate image for this coding. I need help to finish my final year project.

clear all

% baca image ori
a = imread('C:\Users\nazmiz\Desktop\PCB Tester\TestedPCB\Original.jpg');
a1 = im2bw(a,0.5)
imshow(a1)

% baca image nak test
b = imread('C:\Users\nazmiz\Desktop\PCB Tester\TestedPCB\Test.jpg');
b1 = im2bw(b,0.5)
imshow(b1)

% buat subtraction dapatkan beza
c = imabsdiff(a1,b1);
imshow(c)

d = imcomplement(c);
imshow(d)

%e = regionprops(c,'centroid');
%centroids = cat(1,e.Centroid);
e = regionprops('table',c,'Centroid','MajorAxisLength','MinorAxisLength')
centers = e.Centroid;
diameters = mean([e.MajorAxisLength e.MinorAxisLength],2);
radii = diameters/2;

subplot(3,3,1), imshow(a), title('Original')
subplot(3,3,2), imshow(b), title('Test')
subplot(3,3,3), imshow(c), title('Difference')
subplot(3,3,4), imshow(d), title('Inverted Difference')
subplot(3,3,5), imshow(b) 

hold on
viscircles(centers,radii);
%plot(centroids(:,1),centroids(:,2),'b*')
hold off
title('Labeled')

[MUHAMMAD NAZMI ZAINAL AZALI]

and i need help to crop to the accurate image of the circuit

Answer 1

[Image Analyst]

Attached is a start. It looks bad because you provided a heavily compressed JPEG image with uber-bad artifacts.

[MUHAMMAD NAZMI ZAINAL AZALI]

so, the coding is right, but i need a better quality of the picture? actually his image i from webcam then the coding need to process the image.

[Image Analyst]

Use a better camera. Don't save as JPEG. Use better lighting and lenses.

[MUHAMMAD NAZMI ZAINAL AZALI]

can you recommend the best format that i need to save? may i know how to make a counter capture thus crop the region that i want?

[MUHAMMAD NAZMI ZAINAL AZALI]

Actually this is my GUI

[Image Analyst]

I use PNG format whenever I can. I think most people do. It's pretty much the de facto standard these days.