Dynamic Range...

Kjetil Haugen said:
Jannard said:
We are shooting this week and should have footage to post next week.

Jim
Click to expand...
Is it too early for some outdoor footage?
Click to expand...
Good question Kjetil. And :dankk2: for your announcement Jim. We hope for it as much as possible.
 
They said that to ask a question is a sign of intelligence. If this is true I must be a friggin genius!

Jim, what does it mean to "characterize the chip"?

Jay
 
They as in the amorphous 'they' which is required by the english language since we can't form setences without an overt subject (unlike many languages which would just use a form of the verb by itself).

:D
 
You could also have phrased it more like a proverb... "it is said that to ask a question is a sign of intelligence".
 
Jim,

I wrote to a nice lady at Red and asked about getting a T-shirt and she said you felt they were not up to your standards yet.

Why in the cornbread hell are you wasteing time with this stupid camera when you could be perfecting the ultimate RED T-shirt!?

I am being made fun of out here in St. Louis and I want to wear my RED T-shirt and openly show I am NOT ASHAMED!!!

I wanna shirt

Jay
 
What the potato chip hell is "cornbread hell"?

I want a "RED" polo shirt and a hat. Maybe a tie, although I can't remember that last time I wore one.
 
Jay A. Kelley said:
I am being made fun of out here in St. Louis and I want to wear my RED T-shirt and openly show I am NOT ASHAMED!!!
Click to expand...
Okay, here you go. :)
 

Attachments

  • tshirt.jpg
    tshirt.jpg
    14.2 KB · Views: 0
You could also have phrased it more like a proverb... "it is said that to ask a question is a sign of intelligence".
Click to expand...
True, this is an interesting linguistic case. Make the sentence passive and drop the subject.

"It is said [by them] that ..."

Wow that was really geeking out... I'll shut up now :D
 
Last edited:
This is why brainiacs make such good politicians. You all got so obsessed over the wording of my post, YOU FORGOT TO ANSWER THE QUESTION!!!

What does it mean to "Characterize the Chip"?

Sheesh...

Jay
 
Maybe it's the measure the transfer function of the sensor... this way you can correct for any non-linearities. If you look at some exposure latitude tests of the Dalsa Origin, film stocks, Viper, Andromeda-modded DVX100, etc. (basically any camera that shoots extended dynamic range) you see that the whites tend to shift colors. The Andromeda is especially apparent when it comes to this.
Theoretically, it might be possible to calibrate against any non-linearities so the whites don't shift colors. Or they re-design the sensor to improve its characteristics.
The test footage does show that there is very little color shifting in the highlights though??

2- The characterization might mean something else... measuring the MTF, measuring spectral response, etc.

3- Ok, you know what: I have no idea what characterization means... I am just guessing here.
 
Last edited:
I think characterising might mean giving the chip its distinctive colour pallette and the way it handles exposure and tempratures natively. Maybe.
 
Most importantly, getting the Gamma curves correct.


Here's a nice little scholarly article. I hope your Calculus isn't too rusty. . .

http://www.ph.tn.tudelft.nl/People/lucas/publications/1994/SPIE94JMLVea/SPIE94JMLVea.pdf

The introduction: (Now, I just need a PHD to English translator.)

The methods given in this paper describe how to accurately measure the following properties: linearity of
photometric response, signal-to-noise ratio (SNR), sensitivity, dark current and spatial frequency response.
Linearity of photometric response, which comes with the use of semiconductor sensors, is in some cameras
mapped to a nonlinear scale in order to 'gamma-correct' the video signal to produce a linear response on a video
display device. This 'gamma-correction' feature needs to be switched off if one requires a linear response. Dark
current is defined as the production of electrons per pixel from thermal energy. The SNR per pixel (SNR = 20
log(a/s), with 'a' the signal's amplitude and 's' the standard deviation of the noise) is limited by several noise
sources, such as, photon shot noise, readout noise, dark current noise and quantization noise. Spatial frequency
response quantifies the sensitivity of the camera to a spectrum of spatial frequencies. Sensitivity relates a camera
system's ADC unit to the number incident photons per pixel.​
 
Last edited:
You must log in or register to reply here.
Back
Top