Showing posts with label stuff. Show all posts
Showing posts with label stuff. Show all posts

2014/06/13

DIY stereo image of earth from ISS

Here's a simple method for capturing 3-d images of the earth from the live streaming video from the ISS. The method does rely on you being able to cross or uncross your eyes to obtain a single image from two.
The cross eye method.
  • Place the 2 images at sensible viewing distance with dark, uncluttered  background. these should be side by side with edges parallel. 
  • Cross your eyes as if you are looking at the end of your nose.
  • Slowly concentrate your brain on the confusion of images of the stereo pair.
  • Gradually uncross your eyes until your brain sees 3 distinct images.
  • Move your eyes and head until the centre image of the three is a single combined as one.
  • Then use your brain to decipher the 3D.
If you're that way inclined you can try the alternative stare straight ahead method (I cannot do it!)
How to get the images.
Simple...
go here:
http://eol.jsc.nasa.gov/HDEV/
  • Do a screen capture of the NASA video place it in an editor.
  • After a perhaps 20 seconds (chose what works best for you) capture another image
  • Crop both pictures to the video and rotate them 90 degrees
  • Place side by side
  • Do the eyeball stuff.
 It probably works best on the downward facing camera (not often used) - example shown below - note that picture has been cropped to show similar location.
  
If the screen capture captures every extended screen on your computer the press [ALT] [print screen] with the video page selected.
You can of course use the full screen mode of the video and screen capture that.

Of course it is not very good stereo there's too much distance to the subject!

First here's one for cross eye viewing from downward camera

cross eyed view for downwarsd facing camera (US) CLICK to ENLARGE image
Australia using maximum baseline=max 3d

cross eyed view for downwarsd facing camera (africa) CLICK to ENLARGE image


cross eye - good depth of clouds



An  image (west coast South America)
straight ahead






2014/04/10

Recover Deleted Files in Windows 7

http://windowssecrets.com/top-story/rpv-win7s-least-known-data-protection-system/

Only the important bits below

What is Restore Previous Versions, exactly?

Introduced in Vista and now present in all editions of Windows 7, previous versions are local backups of every data file and folder that changes on your system.
The backups are created automatically and are instantly accessible.

Previous versions do for your standard documents (text files, spreadsheets, photos, whatever) what Windows System Restore does for system files.

The function that creates previous versions is enabled by default and is probably working right now on your PC, whether you’ve ever used the previous-versions feature or not.

As Microsoft’s FAQ puts it: “You can use previous versions to restore files and folders that you accidentally modified or deleted, or that were damaged.

Depending on the type of file or folder, you can open, save to a different location, or restore a previous version.”


Exploring your previous-version files

By default, Vista and Win7 make copies of changed folders and files at least once a day.

But you can adjust the schedule at will.

To start, open Windows Explorer, right-click My Documents (or wherever), and select Restore previous versions

The rest is logical!!!

An important point is: right clicking a filename and using restore previous version only works if you have not moved it. Using the above method allows recovery from its original location.