Contents of my public archive

KH 1997-06-12

The images directly referenced by this WWW document may be used freely for scientific, non-profit purposes, on the condition that a reference is made to the origin/originator(s) of the images.

Various images of interest

In connection with the Hough project I have used the following images for testing etc. (Original format is DIKU image, here converted to GIF).

Figure 1(a) from the Hough paper (see reference below), a synthetic test image.
Figure 1(b) from the Hough paper (see reference below); it is an edge detected version of milk carton 3, which was intentionally created as a poor image with noise, low contrast and disturbing texture.
Figure 1(c) from the Hough paper (see reference below); it is an edge detected version of pentagon. The best 100 (as determined visually) lines in the main five directions are shown in ideal (a pseudo-colour image); lines are marked in red, line points coinciding with edgepoints are green.
edlevel000 was not used in the Hough paper, but is useful when finding lines; it is an edge detected version of level000 a photo of a Russian robot.

The Hough paper is: "K. Hansen & J. D. Andersen: Understanding the Hough Transform (Image and Vison Computing 15 (1997) pp. 205-218)"

In "J. D. Andersen & K. Hansen: Sequential line detection using reciprocating Hough-mappings (9. SCIA 1995)" two of these images were used.

Edge detector evaluation

Index of images related to edge detector evaluation. An ASCII version of that page exists.

Some of these images has been presented and used in e.g. "K. Hansen: Synthetic images for comparing and calibrating edge detectors (9. SCIA 1995)"

Other archives

These images may be copyrighted - please check before using them.

The Computer Vision Homepage has a reference to a list of test image archives.

I have found interesting images for edge detector evaluation in e.g.

SUSAN home page ("susan-test")
the Linköping image archive ("ploop", "bredploop")
the Ohio SPIE Florida 1992 (SPIE vol. 1708) test image set ( "brain", "einstein", "office", "onelake", "synthetic.clean", "synthetic.noise", and "tree")
In an article by Spreeuwers, L.J. and van der Heijden, F. in 1992: a Voronoi pattern and associated reference image.
I caught a test image checK in the NetNews group on image processing, but forgot who the artist is.