CAP-XX, a manufacturer of supercapacitors, says in its press release that its "LED BriteFlash" is brighter and smaller than most Xenon flashes and "can offload demands from the battery and handle all mobile-phone functions that need peak power -- wireless voice and data, GPS readings, digital video, music and TV -- improving talk time, battery life and audio quality."
Figuring light energy
CAP-XX says:
"The key to clear pictures is Light Energy -- the total amount of light that fills a camera's pixels during image-capture time.
"On the other hand, Light Power refers to the intensity of a flash. Light power, along wi th flash exposure time is used to calculate Light Energy: light power (lux) x flash exposure time (secs) = Light Energy (lux.secs).
"Ten to fifteen lux.secs of Light Energy is ideal for high-resolution pictures.
"Xenon flash has excellent light power, but a very short flash exposure time.
"An LED flash, powered by a supercapacitor, delivers lower light power over a longer flash exposure time for total Light Energy that exceeds or equals most Xenon flashes."
Not perfect
The company's camera phone flash product doesn't solve all problems, though. The release says, "A supercapacitor-powered LED flash delivers lower power over longer time for total Light Energy that exceeds or equals most Xenon flashes.
"This solution is capable of higher-quality still shots, but not action shots, in low light. A designer can use image-stabilization software to correct for hand movement that may cause blurry photos.
"Xenon, with its short exposure time, is superior for capturing fast-moving action shots in low light."
Light, power, action
Hmmm. If CAP-XX admits its flash requires image stabilization software for "action shots," that's obviously a drawback. Camera phone "shake" is a major cause of blurred photos, with or without a flash.
Camera phones are more prone to movement than digital camera because they usually are lighter and not often held with two hands and steadied. Also, the "shutter lag" in camera phones means many users move the phone before the photo is taken and saved, also causing blurring.
There are significant improvements in image stabilization software for digital cameras and I assume camera phone vendors can take advantage of these developments.
However, I'm certainly not an expert on the physics of flash technology.
Future products
CAP-XX says its product will begin showing up in camera phones at the end of 2007 or 2008.
[Sent via TypePad wireless e-mail with RIM BlackBerry 8700g]