BIG - Edge Detector

Biomedical Imaging Group

Imaging Web Demonstrations

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BIG > Demos > Edge Detector

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Research

Demos

Edge Detector

Description

Edge detection is a fundamental operation in image processing. We propose here an efficient and fast method similar to the Canny-Deriche edge operator. There are five steps following the diagram:

1. Smoothing: using a gaussian smoothing operator

2. Gradient

3. Non-maximum suppression

4. Hysteresis threshold

diagram

Instruction to use the applet

Choose an input image in the list.
You can upload your own image into the applet.
Choose your image file and click on the button "Launch Demo".
The applet accepts GIF or JPEG 256*256 pixels image (max size 1 Mb).
Choose the parameters.
Press on "Run All steps" button to run all the steps or "Step" button to process step by step

Toolbar in the image display

	Get the coordinates and value of a pixel.
	Get the maximum, minimum and the mean value of the image.
	Open a new window containing the image.
	Zoom out by a factor 2. (N/A on Netscape)
	Zoom in by a factor 2. (N/A on Netscape)
	Move the zoomed part of the image. (N/A on Netscape)