- CAP-XX -
Highend camera phones are greatly improving, with better lenses and higher resolution, but they need a better light source for taking photos in low light. Until now, highend phones such as Sony Ericsson's K850 and Nokia's N82 have used a xenon flash.
However, the large electrolytic capacitor in these xenon solutions precludes slimline phones. A new solution with a total thickness of less than 3mm is now possible using very highbrightness LEDs and CAPXX supercapacitors.
Light Energy Required for Good Photos
Clear photos require that sufficient light energy is received by each pixel in the camera sensor during imagecapture time. What naturally draws our attention, however, is light power, or brightness of the flash. Light energy is the area under the curve of light power over To calculate it, integrate light power (measured in lux) over duration of the flash exposure (in seconds). For constant LED light power: Light power (lux) x flash exposure time (secs) = light energy (lux.secs ).
Xenon flashes have excellent light power, up to several hundred thousand lux, but a very short pulse duration, typically 50 100レsec. A highquality xenon cameraphone flash typically delivers between 10 15 lux.secs of light energy at 1m distance from the subject.
LED flashes deliver lower light power, but sustain a longer pulse to generate sufficient light energy. Today's highend LED flash camera phones typically drive one or two LEDs at up to 300mA each delivering 50 70 lux. In low light, the camera sensor will drop to 7.5 Frames/second, so each pixel integrates light for 1/7.5 = 133ms. Total light energy = 2 LEDs x 0.133 x 60 = 16 lux.secs.
However, such a camera sensor uses a rolling shutter, so the total image capture time is double the frame
Period or 267ms. This long imagecapture time results in blurry photos if the photographer's hand shakes or the subject moves.
For details, click http://
Highend camera phones are greatly improving, with better lenses and higher resolution, but they need a better light source for taking photos in low light. Until now, highend phones such as Sony Ericsson's K850 and Nokia's N82 have used a xenon flash.
However, the large electrolytic capacitor in these xenon solutions precludes slimline phones. A new solution with a total thickness of less than 3mm is now possible using very highbrightness LEDs and CAPXX supercapacitors.
Light Energy Required for Good Photos
Clear photos require that sufficient light energy is received by each pixel in the camera sensor during imagecapture time. What naturally draws our attention, however, is light power, or brightness of the flash. Light energy is the area under the curve of light power over To calculate it, integrate light power (measured in lux) over duration of the flash exposure (in seconds). For constant LED light power: Light power (lux) x flash exposure time (secs) = light energy (lux.secs ).
Xenon flashes have excellent light power, up to several hundred thousand lux, but a very short pulse duration, typically 50 100レsec. A highquality xenon cameraphone flash typically delivers between 10 15 lux.secs of light energy at 1m distance from the subject.
LED flashes deliver lower light power, but sustain a longer pulse to generate sufficient light energy. Today's highend LED flash camera phones typically drive one or two LEDs at up to 300mA each delivering 50 70 lux. In low light, the camera sensor will drop to 7.5 Frames/second, so each pixel integrates light for 1/7.5 = 133ms. Total light energy = 2 LEDs x 0.133 x 60 = 16 lux.secs.
However, such a camera sensor uses a rolling shutter, so the total image capture time is double the frame
Period or 267ms. This long imagecapture time results in blurry photos if the photographer's hand shakes or the subject moves.
For details, click http://
Cable Sleeve,Harness Pattern Braided Tube,High Flame Retardant Woven Network Pipe,New Woven Mesh Pipe
Shenzhen Huiyunhai Tech.Co., Ltd. , https://www.cablesleevefactory.com