stereograms
Posted:
23 Sep 2005, 15:09by Guest
cooool!! But I wonder how the stereograms are generated. Can you help me to understand? I can't find any doc on the internet!! I noticed that when looking at an oscilloscope grid the way you look at the stereogram, variating the sine frequency makes it jumps out of the screen!!
thank you,
MC
le forum est en anglais, alors j'écris en anglais, mais je suis français!!
Posted:
05 Oct 2005, 13:30by Wernight
I don't know how to explain because it's not simple. The background is a reference for the eye. So a flat stereogram has just vertical bands of the same image repeated horizontally. One eye would see one band while the other sees it's neighbour.
Now if you move some zones from one band to the other, your head would interprete it as an object that is on another level because both eye see it but for one of the eyes it's shifted a bit.
You can make a little experiment first. Put an apple on a table that has some pattern. Now look from the table's border and close one eye then the other. You'll see that the apple "shifts" more than the table. Now if you are focusing on the table's end you'll find that the focusing point don't move at all, only the apple.
The tricky part comes whem you want to make horizontal lines. It took me some time to find out. So just play with a photocopy machine or with a paint application on your PC to find out more.