How can I modify this code so that canny edge detector can detect this red mark line ?

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sufian ahmed
sufian ahmed 2017-7-27
编辑： sufian ahmed 2017-7-29
I take image using Microsoft kinect. But all time canny edge detector missed that line. I dont know why ?how can i detect this line? I attached here raw depth image & output of canny. Don't hesitate about black depth image. it works. When u run my code u will see that in red arrow area of raw depth image has an edge but after canny operation it vanished.
A_depth_distance=imread(raw_depth_image);
figure,imshow(A_depth_distance,[0 4500]);
%Filtering the raw depth image Median
filtered_depth_distance=medfilt2(A_depth_distance,[3 3]);
figure,imshow(filtered_depth_distance,[0 4500]);
title('Filtering the raw depth image Median');
%Edge Detection Using Canny Operator
edges_depth_distance=edge(filtered_depth_distance,'canny',[0 .02],4);
figure, imshow(edges_depth_distance);
title('Image obtained using Canny Operator');
Raw Depth Image:
Canny output:

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