Originally Posted by mark haflich
Some degree of cross talk will always be present just like there is always some degree of cross talk in multi chanel (two or more) audio reproduction. Ghosting is an artifact of cross talk. It is viewer dependent among other things. i really wish the terms were not used interchangeably by consumers. The trick is eliminating ghosting which is done by reducing but not eliminating cross talk.
Thanks, Mark, for pointing out the difference. Because I've been guilty of using the two terms interchangeably, I'll try to add a little clarity to the distinction, as I understand it. I appreciate clarity, so if I'm inaccurate with any of the following, someone please correct it. Here's Wikipedia's explanation of "crosstalk" in stereoscopic 3D:
"In Stereoscopic 3D Displays, "crosstalk" refers to the incomplete isolation of the left and right image channels so that one leaks or bleeds into the other - like a double exposure. In this area, crosstalk and ghosting are often used interchangeably, however crosstalk is a physical entity and can be objectively measured, whereas ghosting is a subjective term and refers to the perception of crosstalk."
Unlike audio recording, a true stereoscopic 3D recording has no crosstalk in the recording itself. The left eye camera records only the left eye view, the right eye camera only the right. Crosstalk is a result of imperfect display technology (such as lag time in LCD displays), imperfect synchronization technology (such as what the Samsung firmware updates have addressed), and imperfect 3D glasses (polarized glasses that are incapable of blocking all the light from the other eye view, or LCD shutters that do not, in fact, close completely, but instead let a fairly significant amount of the light through even when they're "closed"). In a very real, quantifiable sense, crosstalk can be measured. I think it's altogether possible that we will one day have a 3D stereoscopic system that will have no crosstalk at all. We "simply" have to make sure that one eye sees only what it's supposed to. (In the easier-said-than-done category, but definitely doable, I would think.)
"Ghosting" refers to the perception of crosstalk by the individuals viewing the 3D, and it is therefore a subjective term. Measurable crosstalk is imperceptible ghosting, if no one can see it. Based on what I've seen with my own shutter glasses (Samsung, but the Panasonic ones are very similar in terms of crosstalk), there must be measurable crosstalk in virtually every single 3D shot I've seen. In other words, the shutter glasses never completely block out all the light. AVSer Frank has a thread where he's posted test images which effectively demonstrate crosstalk with shutter glasses.
Crosstalk is irrelevant if ghosting is imperceptible. For the most part, Cloudy with a Chance of Meatballs limits ghosting far more than Monsters vs Aliens. The producers do it, I think, by using a color scheme, light intensity and contrast that mask the crosstalk extremely well. OTOH, I don't like the 3D effects as much in Cloudy, even though MvsA has some very distracting ghosting. It's definitely not a perfect world yet.
In the end, then, we can put it this way:
With current consumer 3D systems, crosstalk is present in virtually all shots. Some systems do a better job than others of limiting ghosting, which is the crosstalk that people can actually see. The silver lining is that crosstalk need not be present in a 3D recording, so improving ghosting should be achievable. Since I'm hopeful that 3D is here to stay this time around, I look forward to a time in the future in which there will be no crosstalk at all, and therefore no possibility of ghosting.
I'll be equally as happy if crosstalk can be limited enough that there is no perceptible ghosting, even in the most challenging, high contrast shots.