Re: GSoC: automatic brightness adjustment

2012-04-08 Thread Dario Freddi
Il 08 aprile 2012 13:25, Mike Dean ha scritto: > FACTS people, FACTS.  Idle speculation will > get you nowhere in life. As you wish: 1. In what kind of ideal world where we have working and documented drivers for everything we could do what you said even remotely, and most of all into userspace?

Re: GSoC: automatic brightness adjustment

2012-04-08 Thread Mike Dean
A "real" light sensor is typically just a CdS cell. CdS, Cadmium Sulfide, reacts to light by changing its resistance. The circuit is very simple (put it in series with a resistor to form a voltage divider, and read the resultant voltage), and very cheap. That, of course, is why we'd use them for

Re: GSoC: automatic brightness adjustment

2012-04-05 Thread Simon Oosthoek
On 05/04/12 16:39, Dario Freddi wrote: > Any other engineers want to give out their opinion? :D (joking) Sure ;-) On my laptop, the webcam is covered by a bit of paper (not joking, some of us are paranoid ;-) But why not design and build a real ambient light sensor with a usb interface and use th

Re: GSoC: automatic brightness adjustment

2012-04-05 Thread Dario Freddi
Il 05 aprile 2012 16:28, Christopher Blauvelt ha scritto: > > > On Thu, Apr 5, 2012 at 7:20 AM, Dario Freddi wrote: >> >> Il 05 aprile 2012 07:32, Mike Dean ha scritto: >> > As an electrical engineer, I find this idea sound. >> >> Allow me, as an information engineer and a computer scientist, to

Re: GSoC: automatic brightness adjustment

2012-04-05 Thread Christopher Blauvelt
On Thu, Apr 5, 2012 at 7:20 AM, Dario Freddi wrote: > Il 05 aprile 2012 07:32, Mike Dean ha scritto: > > As an electrical engineer, I find this idea sound. > > Allow me, as an information engineer and a computer scientist, to > > As an engineer (choo, choo, I'm wearing my hat!) allow me to remin

Re: GSoC: automatic brightness adjustment

2012-04-05 Thread Dario Freddi
Il 05 aprile 2012 07:32, Mike Dean ha scritto: > As an electrical engineer, I find this idea sound. Allow me, as an information engineer and a computer scientist, to think you missed part of the picture :) I don't want to challenge your argument of the power consumption of the webcam even though

Re: GSoC: automatic brightness adjustment

2012-04-05 Thread Sebastian Kügler
On Thursday, April 05, 2012 00:32:19 Mike Dean wrote: > As an electrical engineer, I find this idea sound. With a low sampling > rate, such as 0.5 Hz (once every 2 seconds), the additional power draw > should be negligible. 1/60th Hz is far too slow to produce enough quality > for users to apprec

Re: GSoC: automatic brightness adjustment

2012-04-04 Thread Mike Dean
As an electrical engineer, I find this idea sound. With a low sampling rate, such as 0.5 Hz (once every 2 seconds), the additional power draw should be negligible. 1/60th Hz is far too slow to produce enough quality for users to appreciate it. 0.5 Hz should be considered a minimum. While the co

Re: GSoC: automatic brightness adjustment

2012-04-04 Thread dE .
On 04/04/12 20:00, Vadim Dombrowski wrote: Thanks for reply! I agree that keeping web-cam always on is not a good idea. Actually it may prevent some real applications, such as Skype to use web-cam. I think about making a shots every minute for example. That partially solves the problem with

Re: GSoC: automatic brightness adjustment

2012-04-04 Thread Vadim Dombrowski
Thanks for reply! I agree that keeping web-cam always on is not a good idea. Actually it may prevent some real applications, such as Skype to use web-cam. I think about making a shots every minute for example. That partially solves the problem with power. On Apr 4, 2012 3:48 PM, "Dario Freddi" wr

Re: GSoC: automatic brightness adjustment

2012-04-04 Thread Dario Freddi
Hi, Il 04 aprile 2012 03:12, Vadim Dombrowski ha scritto: >  Hi! > > I'm a student of Belarusian State University and I would like to > participate in GSoC 2012. > > The idea for my project is to create an automatic brightness > adjustment mechanism using web-camera as light sensor. > Today a lot

GSoC: automatic brightness adjustment

2012-04-04 Thread Vadim Dombrowski
Hi! I'm a student of Belarusian State University and I would like to participate in GSoC 2012. The idea for my project is to create an automatic brightness adjustment mechanism using web-camera as light sensor. Today a lot of laptops have integrated web-camera, but don't have any light sensor. S