Home Accessibility Courses Twitter The Mouth Facebook Resources Site Map About Us Contact
 
For 2021 - online Python 3 training - see ((here)).

Our plans were to retire in summer 2020 and see the world, but Coronavirus has lead us into a lot of lockdown programming in Python 3 and PHP 7.
We can now offer tailored online training - small groups, real tutors - works really well for groups of 4 to 14 delegates. Anywhere in the world; course language English.

Please ask about private 'maintenance' training for Python 2, Tcl, Perl, PHP, Lua, etc.
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 articles
G912 - Well House Consultants - Photography for the Web
  [97] What makes a professional photographer? - (2004-10-23)
  [194] Published Photographer - (2005-01-30)
  [546] The relevance of the hairy woodpecker - (2005-12-28)
  [553] Keep that image small - (2006-01-03)
  [563] Merging pictures using PHP and GD - (2006-01-13)
  [665] PHP Image viewing application - (2006-04-01)
  [819] My projector has a photo-id - (2006-07-31)
  [937] Display an image from a MySQL database in a web page via PHP - (2006-11-22)
  [1087] Telling a story in different ways - (2007-02-20)
  [1114] PHP Image upload script - (2007-03-21)
  [1185] Themes for the web site - (2007-05-13)
  [1188] What shape is your shake? - (2007-05-15)
  [1194] Drawing hands on a clock face - PHP - (2007-05-19)
  [1396] Using PHP to upload images / Store on MySQL database - security questions - (2007-10-19)
  [1506] Ongoing Image Copyright Issues, PHP and MySQL solutions - (2008-01-14)
  [1568] What colour is the season? - (2008-03-08)
  [1732] Old pictures and comparisons - (2008-08-01)
  [1895] Comparison - with and without flash - (2008-11-20)
  [2224] Trowbridge - a missed opportunity? Melksham - into the breach? - (2009-06-08)
  [2252] Leaping dog, Leaping horse, copyright of old masters - (2009-06-20)
  [2592] Re-using our pictures - (2010-01-21)
  [2884] Hotlinked images onto adult material sites - (2010-07-23)
  [3104] Catering in Syracuse, the Saigon Cafe, stolen images and Christmas - (2010-12-25)
  [3402] That spec is a kingfisher ... - (2011-08-21)


Back to
Rekeying a table - comparison in #Ruby #Perl and #Python
Previous and next
or
Horse's mouth home
Forward to
Train and boat journey - the passenger accommodation
Some other Articles
Sharing a single hotel internet connection without carrying extra hardware
What is the Melksham Chamber of Commerce?
On consultations, car parking, and Melksham town centre
Train and boat journey - the passenger accommodation
How far is something pictured from the camera?
Rekeying a table - comparison in #Ruby #Perl and #Python
Web Sites - Subject to Advertising Standards from 1st March - check your sites
Can I take my dog by train? And other questions
Well house is strong - confirmed?
Journalism 101
4759 posts, page by page
Link to page ... 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96 at 50 posts per page


This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

Link to Ezine home page (for reading).
Link to Blogging home page (to add comments).

You can Add a comment or ranking to this page

© WELL HOUSE CONSULTANTS LTD., 2021: 48 Spa Road • Melksham, Wiltshire • United Kingdom • SN12 7NY
PH: 01144 1225 708225 • EMAIL: info@wellho.net • WEB: http://www.wellho.net • SKYPE: wellho

PAGE: http://www.wellho.net/mouth/3170_How ... mera-.html • PAGE BUILT: Sun Oct 11 16:07:41 2020 • BUILD SYSTEM: JelliaJamb