| Author | Message | ||
     pete ross Rating: N/A |
What is the difference between ghosting and crosstalk or are they the same thing? How do they actually occur and what are the effects?? Thanks | ||
| M.H. Rating: N/A |
I is the same ... Most typical examples - white bright object are visible as ghosts in incorrect eye ... General methods of elimiation: - do not use to much contract and pure white I can start a long list of methods how to elimenate this effect for different stereo visualization techniques- just let me know what do you exacly need. | ||
| Allan Silliphant Rating: N/A |
Ghosting and cross talk relate to the image elements seen in one eye of any kind of viewer than would be better not to see at all! That being said, the 3 stereo methods: polarized, liquid cyrstal, or anaglyph are all DUAL IMAGE OVERLAY METHODS. Discrete viewers, like the traditional stereoscope have zero ghosting. No polarizer is perfect. anaglyph filters even less so. There is new Anaglyph technology that works bettter than earlier methods, in several ways. Anachrome is the best known of the new RED/ CYAN methods. It offers better color bandwidth, especially in the REDish warm range. The images are sharper, have much more contrast, and if you you don't make them properly they will GHOST! The fix for the ghosting is to shoot a more precisely overlaid image. When the pixel fit almost exactly on the main subject, you can see subject's pink ears, red lips, red sweaters and even fire engines, and muted red Ferraris. The close overlay is acheived by shooting with a reduced seperation between the lenses of the cameras, and by making slight rotational adjustments, avoiding any toe-in converging, and process the main subject or people in the picture first. Secondly reducing the total picture size of the pair by 3%, then creating a tighter overlay of the background. Try to keep every thing in the far background within 7 to 10 pixels of overlay. And...as the person in the previous comment said....HOLD DOWN your CONTRAST and avoid pure white objects near dark objects. Then plant the main subject back into the flattened scene. Such a picture may have excellent RGB color and be easy to view once you get the hang of the technique. In effect, good 3D color in Anaglyph is possible if you really go the distance. And ghosting and cross talk are no longer a problem. There are over 500 images in this technique to be seen on www.anachrome.com Many of these tricks may be applied to video process for anaglyph as well! |
