Watch This Space:  Version 2 of CentreCam software will be available soon;

With New features and bug fixes.




Typical images using the CentreCam are shown below (* See note below):

This image shows an image of a piece of brass with scribed horizontal and vertical lines plus an enclosing box of dimension 0.64 inch x 0.48 inch.  This was used for calibration. 

Note that a low angle light source was used that gave rise to the glints in the upper part of the image.

To assess the offset of the boresight axis of the camera the scribed lines were centred in the image (middle centre pop).  The camera was replaced with a centre which was gently lowered to produce a second pop - the true centre.  CentreCam axis was adjusted this point (yellow lines).  The centre of these yellow lines represent the true centre of the camera.

The displacement from the image centre was larger than expected.  When a second webcam was used this was much closer and more acceptable.  The difference in results were assumed to be down to the fact that the first webcam was the one used for all of the experimental work and the lens assemble had because quite loose.  The new webcam was much more rigid.

Of course, these low cost webcams are not produced for precision work and the manufacturing quality control is set accordingly.   

This image shows the circle alignment line being used to estimate the true centre of a hole.
Here, two edges of a block are aligned with the symmetrical crosshairs to set determine its centre.
The corner of a work piece is can be aligned for precise edge detection.

* These images were captured prior to the LED illumination ring being fitted.  For results with the LED illumination see Results with LED illumination.


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Copyright 2006 Mike Trethewey

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