Design Article
Comparison of xenon flash and high current LEDs for photo flash in camera phones; a review and update
Pierre Mars, VP of Applications Engineering, CAP-XX Ltd.
6/22/2009 10:07 AM EDT
This article provides new information updating an Oct 2006 study
comparing light sources for camera phones. The original report, "Get
enlightened about camera phone flash units -- compare xenon to
high-current LEDs," compared light power and light energy measured over
time using camera phones ranging from 1.3 to 3.2-megapixel resolution.
This new report includes data captured from higher resolution,
5-megapixel camera phones released in the last year, and also considers
the technology advancements in camera sensors, xenon flash units, high
power white LEDs (WLEDs) and LED flash drivers.
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Comments
Oh no, the smoke got out!
7/1/2009 5:55 PM EDT
Shorter flash duration is still important, the longer the flash duration, the more like continuous light it becomes, therefore the more chance of subject movement during the exposure. In the real world, most photos taken with a phone camera would probably be people, often in dynamic situations such as parties. 30mS or shorter would be a reasonable target duration.
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