[Elphel-support] Extension of stereobase and elongation sensor's cable length

[Клещенков Анатолий]

17.04.2015 0:05, Oleg пишет:
>
> We do have some monochrome sensor boards.
> You can buy them but using a monochrome sensor reduces overall 
> resolution of the sensor+lens combination. And most of nowadays the 
> applications deal with color sensors.
> So, you can:
> a. Keep using a color sensor - just work with R, G and B channels 
> separately, then combine.
> b. Get a monochrome sensor - but use a green color band filter in 
> front of the lens to a have better resolution.
>
I am not familiar with sensor's details but I know that in color sensor 
actual resolution for every color channel  is lower than resolution 
provided in specification.
For example if we consider color sensor 200 x 200 px then actual 
resolution for Red and Blue channel is 100 x 100 because of Bayer 
filter. Final image resolution 200 x 200 is obtained by interpolation.
Most of mine applications are based on stereovision and processing of 
monochrome images. As you know most of the modern stereo-matching 
techniques operate with grayscale images too.
My another knowledge is that monochrome sensor has a much higher 
sensitivity than color one at the same resolution. That is why I guess 
that using the monochrome sensor let me obtain higher ratio of 
signal/noise at the same resolution than color sensor. What do you think 
about that?
 From the other hand you mentioned about reducing of overall resolution 
of the sensor+lens combination. Do you mean reason of light dispersion 
in the lenses?  Actually we have done a lot of experiments to find out a 
acceptable quality of the lenses for 5PMx resolution. We use now high 
quality computar M0918FIC-MPlenses. These lenses gives the best results 
of the all we try but anyway I suppose these lenses do not utilize a 
full resolution of the sensor. I think so because images analysis shows 
that high contrast contour line appears at the images like smooth 
contour with several pixels width. At the same time at the half (about 
1MP) resolution we obtain much more contrast contour.



> Best regards,
> Oleg Dzhimiev
> Electronics Engineer
> phone: +1 801 783 5555 x124
> Elphel, Inc.

-- 
С уважением, Клещенков Анатолий.
г. Ростов-на-Дону
теп.: +7(863)275-95-05
e-mail: aktech at inbox.ru

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