Problem in EDGE dectection because of similar intensity at a point

Hi.. I'm able to find the EDGEs from the image except in the red position shown in the link <http://tinypic.com/view.php?pic=30dfrbl&s=7> because of similar intensity and the dge detected image is <http://tinypic.com/view.php?pic=4lnbrp&s=5>

Can anyone suggest a method to find the edge inside this red portion

Answer 1

[Image Analyst]

What does that mean - "the edge inside the red portion"? You already have edges in your edge image. And you have a color image with some reddish areas. Do you want to do color segmentation to find the red areas (to get a binary image) and then AND that mask with your edge image to find out if any edges from your edge image fall inside the red region of interest of your color image???

[Gova ReDDy]

No..Actually I'm unable to detect the edge inside the red portion of this image http://tinypic.com/view.php?pic=20qmcet&s=5 becuase of similar intensity I think .So what should I do to find this

[Gova ReDDy]

I think the canny edge detector is not detecting the edge inside this red portion because of similar intensity.

[Image Analyst]

Then there are no edges according to the parameters used. You need to adjust your parameters to be more sensitive to edges or try a different edge detector.

Answer 2

[Gova ReDDy]

Im interested to find the edge of the sheet as shown inside the red mark here

<http://tinypic.com/view.php?pic=2qntaip&s=7>

 _The problem I'm facing is that _some part of edge of the sheet is not detected becuase of similar color or intensity of area sorrounding the sheet edge._ as shown in this resultant image

<http://tinypic.com/view.php?pic=4lnbrp&s=5>

Can anyone suggest an efficient method to find this sheet edge.

[Image Analyst]

Try fitting what you do have to a line or quadratic.