For 2023 - we are now fully retired from IT training.
We have made many, many friends over 25 years of teaching about Python, Tcl, Perl, PHP, Lua, Java, C and C++ - and MySQL, Linux and Solaris/SunOS too. Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own risk.
Lisa and I (Graham) now live in what was our training centre in Melksham - happy to meet with former delegates here - but do check ahead before coming round. We are far from inactive - rather, enjoying the times that we are retired but still healthy enough in mind and body to be active!
I am also active in many other area and still look after a lot of web sites - you can find an index ((here))
How far is something pictured from the camera?
Camera shake? No - this is an image with depth - three dimensions. It's a photograph of a train window - and what you're seeing is the reflection of the inside of the carriage. The 'trick' is that the window is double glazed - and you're seeing two images, one being the reflection in the inner pain and the other being the reflection in the outer plain - for a window is not a mirror, and the other evening it was reflecting about half of the light on the inside, and letting half pass straight through to the outer
As light travels in a straight line and reflects symmetrically, picture components further from the point of reflection will show with a greater offset.
But there aren't just two images .. there are further images, fainter, that you can see in the picture. This is where the light bounces back and forth between the two panes of glass before breaking through the inner pane to the camera lens.
I've seen this sort of thing before - way back in the early 1970s, I was involved with Seismic exploration for oil, where shock waves were generated on the surface, traveled down to the interfaces between different rock layers, where some was reflected back and some carried on through. By analyzing the returns, you can get a picture of rock interfaces deep below the surface. Once again, you see "multiples" with artificial extra returns. But actually the rock interfaces business - which looks for the shape of folds in the rock by taking a series of readings along a lines - is made very much more complex by the different speed that shock waves travel through different types of rock, and by the dampening effect of sand.
Filtering to remove multiples in seismic sections can be done through a deconvolution filter - and I don't see any reason why that couldn't be done pictures - perhaps someone has done so already. Sounds fun ... but not a project for me; I've too much plenty else to do. (written 2011-02-15, updated 2011-02-19)
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articlesG912 - Well House Consultants - Photography for the Web 
What makes a professional photographer? - (2004-10-23) 
Published Photographer - (2005-01-30) 
The relevance of the hairy woodpecker - (2005-12-28) 
Keep that image small - (2006-01-03) 
Merging pictures using PHP and GD - (2006-01-13) 
PHP Image viewing application - (2006-04-01) 
My projector has a photo-id - (2006-07-31) 
Display an image from a MySQL database in a web page via PHP - (2006-11-22) 
Telling a story in different ways - (2007-02-20) 
PHP Image upload script - (2007-03-21) 
Themes for the web site - (2007-05-13) 
What shape is your shake? - (2007-05-15) 
Drawing hands on a clock face - PHP - (2007-05-19) 
Using PHP to upload images / Store on MySQL database - security questions - (2007-10-19) 
Ongoing Image Copyright Issues, PHP and MySQL solutions - (2008-01-14) 
What colour is the season? - (2008-03-08) 
Old pictures and comparisons - (2008-08-01) 
Comparison - with and without flash - (2008-11-20) 
Trowbridge - a missed opportunity? Melksham - into the breach? - (2009-06-08) 
Leaping dog, Leaping horse, copyright of old masters - (2009-06-20) 
Re-using our pictures - (2010-01-21) 
Hotlinked images onto adult material sites - (2010-07-23) 
Catering in Syracuse, the Saigon Cafe, stolen images and Christmas - (2010-12-25) 
That spec is a kingfisher ... - (2011-08-21)
Some other Articles
Sharing a single hotel internet connection without carrying extra hardwareWhat is the Melksham Chamber of Commerce? On consultations, car parking, and Melksham town centreTrain and boat journey - the passenger accommodationHow far is something pictured from the camera?Rekeying a table - comparison in #Ruby #Perl and #PythonWeb Sites - Subject to Advertising Standards from 1st March - check your sitesCan I take my dog by train? And other questionsWell house is strong - confirmed?Journalism 101
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This is a page archived from The Horse's Mouth at
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