| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| cfastie | "Here is the range of NIR:VIS ratios for NDVI values between 0.2 and 0.8. " | Read more » | over 8 years ago | |||
| cfastie | "That looks promising. I guess that PiCamera module is a useful tool. I think that photo is a little too yellow. The blue values for foliage are ver..." | Read more » | over 8 years ago | |||
| LaPa | "Hi, I'm here again! I shoot a set of pictures by NoIR modulo cam and blue filter. I tryed finally different white balance. The photo that I post i..." | Read more » | over 8 years ago | |||
| cfastie | "The Bayer filters determine how wavelengths are separated into the three color channels. This is how the camera can sense the balance between the t..." | Read more » | over 8 years ago | |||
| poo | "this green photo don't Relevance to Bayer pattern Mr. @cfastie ? " | Read more » | over 8 years ago | |||
| cfastie | "Black surfaces do not reflect much light, but they do reflect some. Some black surfaces might reflect more green than other colors, and other black..." | Read more » | over 8 years ago | |||
| poo | "hi. I have a question. when I set a black paper or black thing in custom white balance, and then i take a photo, why my photo become a green photo?..." | Read more » | over 8 years ago | |||
| LaPa | "ok, i have to solve some problems of remote link of the Raspberry before taking other photos. And, of course, I have to buy a red filter because th..." | Read more » | over 8 years ago | |||
| cfastie | "LaPa, yes that would be very useful. It would also be useful if someone could do that with a red filter on the NoIR. Blue should be exaggerated whe..." | Read more » | over 8 years ago | |||
| LaPa | "Hi Chris thank you for the suggestions! Do you think would it be a good idea take a set of photos (NoIR camera + blue filter) of the plant graduall..." | Read more » | over 8 years ago | |||
| cfastie | "Those basil leaves should not be the same color as the flower pot. They need to be more orange. To get NDVI values in the appropriate range, the va..." | Read more » | over 8 years ago | |||
| LaPa | "At the moment I took a photo two plants in sunny light. But I didn't manage to take another without gain because it became cloudy :(. Is it possib..." | Read more » | over 8 years ago | |||
| LaPa | "Thank you cfastie, I seem that your post encourages me to keep on this way; I ask confirmation about this. Do you have any idea how to modify the p..." | Read more » | over 8 years ago | |||
| kevinvivergy | "Yeah I was thinking the same with the paint, introduces another source for pollutants. When I called the Dylos folks, they said that the device wi..." | Read more » | over 8 years ago | |||
| DavidMack | "I was thinking you could expose the intake to ambient temperature in winter and by heating the enclosure you'd be warming the instrument and air in..." | Read more » | over 8 years ago | |||
| kevinvivergy | "@Davidmack all good thoughts, thanks for the detailed response. -The big challenge with intake thing is that, if I understand your approach correc..." | Read more » | over 8 years ago | |||
| cfastie | "That orange color of the leaves is promising. It should be even oranger. If you can put the plant in brighter outdoor light and take two photos -- ..." | Read more » | over 8 years ago | |||
| LaPa | "anyway I try awbg. I wrote in the terminal "raspistill -awb off -awbg 0.88,0.97 and I took a picture of the tester and a two plants. The light was ..." | Read more » | over 8 years ago | |||
| LaPa | "Actually I don't know if it is possible mount two modulo cam in 1 Raspberry because it has just 1 slot to mount a modulo cam. I'll find out more ab..." | Read more » | over 8 years ago | |||
| DavidMack | "@kevinvivergy great detailed post. I'm not that familiar with the Dylos--haven't handled one--but looking at some photos maybe just cut out holes ..." | Read more » | over 8 years ago | |||
| cfastie | "It is not clear that the other respondents at the Pi forum understand what you are asking about. Using awb_gains will allow every photo to exaggera..." | Read more » | over 8 years ago | |||
| LaPa | "What do you think about this way to proceed? https://www.raspberrypi.org/forums/viewtopic.php?p=856005#p856005 " | Read more » | over 8 years ago | |||
| kevinvivergy | "Thanks @mathew! Yeah @jeff showed those to me, the AQICN one was pretty straight up too and I just went with theirs because I read their tutorial f..." | Read more » | over 8 years ago | |||
| mathew | "awesome resources and case! hadn't seen this summary of low cost PM sensors: http://www.aqmd.gov/aq-spec/evaluations#&MainContent_C001_Col00=2 " | Read more » | over 8 years ago |