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Old 10-01-2010, 02:43 PM   #1
nicholasdbrady
HT Specialist, Pro 3, BBY
 

Join Date: Oct 2010
Location: Lafayette, IN
Posts: 7
Post 3D Problems: Crosstalk (Image Ghosting) Explained [in layman's terms]

[in layman's terms, or as simple or as defined as possible, given the advanced terms in the definition]

Crosstalk (or image ghosting) is a 3D-stereoscopic (stereoscopic, meaning two-images (left and right or A & B) emulating/creating a three-dimensional image illusion) distortion that is created due to perceptual factors (how the image is viewed). Those factors can included physical depth from the screen, the viewing angle of the screen or the angle of the viewer's eyes (laying on a couch), image quality (as reproduced by the tv, or the video source altogether), and TV technology (such as the previously aforementioned thread about fast-decaying phosphors in plasma TVs).

What crosstalk/image ghosting looks like:
When viewing a 3D source on a 3DTV (3D glasses dependent) without glasses, a double-image or image ghost (often blurry image) is experienced. Blurriness in the 3D image will be greater in instances where the augmented visual depth is greater (i.e.: when viewing a 3D image of a landscape, or an image with large linear difference such as a hallway).
However, when the 3D glasses are worn, if you still see ghosting (or doubling of the image), THAT is crosstalk.

Experiencing crosstalk is subjective in nature, as individual human factors in perception can influence results [i.e.: a human's spatial difference between eyes (how distant your eyes are from each other), visual acuity (20/20 vision, etc.)]. This method of viewing and evaluating 3D is inferior to lab testing measures (crosstalk cannot be tested persay). So, accuracy and precision of measuring crosstalk is strictly point-of-view.

BUT!! That does not discount the fact that you, the customer, and your opinions of which brand is better at reproducing 3D is the correct one. After all, you will be watching that TV, not me (the salesman).

In conclusion, do not get lost in all the hoopla about each 3DTV and their brand's marketing scheme. Just note, that there are issues with 1st and 2nd generation 3DTV technologies as they are in their infant stages. As 3D technologies progress, visual distortion will be reduced, but problems will always exist.
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