i have a question about object detetion

hi everyone ,

i am working on a project regarding detetion of road signs using image processing approaches ,

this is the code i am working on , i wan to find the white object in the right corner of the image . i have attached my out put and also original image .would you please help me how to remove unwanted regions ?like sky and cars

img = imread ('2024.bmp');

r = img (:,:,1);
g = img (:,:,2);
b = img (:,:,3);

white1 = roicolor(r,180, 255);
white2 =roicolor(g, 180, 255);
white3 = roicolor(b, 180,255);
output = white1.*white2.*white3;

% output=medfilt2(output,[3 3]);
output=im2bw(output,0.5);
output=bwareaopen(output,250);
figure
imshow (output)
bw = bwlabel(output,8);
figure
imshow (bw)


stats = regionprops(output,'Area','BoundingBox','Centroid');
imshow(img)
     hold on
     for object=1:length(stats)
         bb=stats(object).BoundingBox;
         bc=stats(object).Centroid;
         rectangle('Position',bb,'EdgeColor','Y','LineWidth',2);
         plot(bc(1),bc(2),'-m+');
         a=text(bc(1)+15,bc(2), strcat('X:', num2str(round(bc(1))), 'Y:', num2str(round(bc(2)))));
         set(a, 'FontName', 'Arial', 'FontWeight', 'bold', 'FontSize', 12, 'Color', 'green');
     end

[Walter Roberson]

https://www.mathworks.com/help/vision/examples/traffic-warning-sign-recognition.html

Answer 1

[Rahul punk]

https://www.mathworks.com/matlabcentral/fileexchange/70220-rahulpunk?s_tid=prof_contriblnk