Richard T. Harbaugh
Two Harbors, Minnesota
Registered: Nov 2004
yes that is the question, but of course it may be some blind alley. We don't know what algorythms logitech mice use. I thought about the problem in a similar way, but I'm not sure the analysis of how the mouse works is correct....I mean it may be, but I just don't have any information.
Why does the mouse work on blank surfaces? For example it works just fine on white or black paper with no visible pattern at all. I have discovered that the mouse will not work on the recorded surface of a CD, although it works on the other side. It does not work very well on my yellow and orange Mathematics of Classical and Quantum Physics book, (Byron and Fuller, Dover Publications 1970).
I would suspect it is the color, not the pattern, which would makes it less interesting from an NKS point of view, except for the fact that the mouse does work on the endpapers of NKS, and they are the same color as the ray, to my eyes.
Picking up surfaces at hand, I find a papberback novel by LaVyrle Spencer (the cover assures me it is a New York Times bestseller, but I have not read it) where there is a picture of the author on the back cover wearing a yellow sweater. The mouse will not work on the sweater, but it does work on LaVyrle's face. There is no pattern in the sweater.
Something about glossy yellow surfaces? And diffraction grateings?
The mouse works on a flat mirror, does not work on a convex magnifying mirror.
I guess we should tabulate this data.
surface color texture pattern mouse works
mirror silver flat reflective yes (makeup mirror)
mirror silver magnifies reflective no (makeup mirror)
paper yellow glossy sweater no (LaVyrle)
paper yellow grainy NKS yes (NKS endpaper)
paper yellow rough NKS no (NKS hardcover)
paper black rough NKS yes (NKS hardcover}
paper yellow glossy NKS no (NKS dustjacket)
CD silver smooth diffraction no
CD silver smooth no diffraction yes
The data suggests that the effect is not correlated to a single tested variable.
Further experiment: mouse does not work on white glossy paperback cover of Kip Thorne's Black Holes and Time warps, nor on white glossy inside surface of NKS dustcover.
Seems mouse does not work on light colored glossy paper. The hardcover is rough, but coated with a glossy finish.
The CD and the mirror both work under direct reflection, but not when the light is scattered by diffraction grating or by curvature of the magnifying mirror.
I suspect the light colored glossy paper scatters the light, as does the concave mirror and the diffraction grating, so the effect is probably due to loss of intensity of the laser due to scattering, not due to the pattern.
It would be interesting to look into this further to determine what if any effect the pattern does have on the laser light and optical scanner, but it would require more controlled conditions than are available on my bookshelf.
Richard T. Harbaugh,
Last edited by Richard T. Harbaugh on 01-28-2005 at 08:13 AM
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