how can i perform edge detection efficiently in matlab?

i have tried four methods i.e. sobel,prewitt,roberts,log but not getting single correct o/p on scanned images.

this is my code- image=imread('sample_img.jpg');

image_gray=rgb2gray(image);

image_BW=im2bw(image_gray);

imshow(image_BW);

image_comp = imcomplement(image_BW);

image_filter = medfilt2(image_comp);

image_fill=imfill(image_filter,'holes');

BW = edge(image_fill,'log',0.2);

at place of "log",i tried other methods too.

thanks for the help..

Answer 1

[Chandra Shekhar]

 I = imread('circuit.tif');
        BW1 = edge(I,'prewitt');
        BW2 = edge(I,'canny');
        figure, imshow(BW1)
        figure, imshow(BW2)

[Aditya Shrivastava]

not working ..

Answer 2

[Image Analyst]

So what's wrong with what you did? There are lots of edge detectors but until I see your image and know what your issue with edge() is, I'm hesitant to just go and list and explain a bunch of edge detection algorithms, which you can look up online anyway.

[Aditya Shrivastava]

hello.. i made a customized code for edge detection... n it worked.. but thanks for the indulgence..