| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| warren | "Some serious progress has been made on this, for running SpectralWorkbench on the Raspberry Pi and connecting to it's camera: https://github.com/pu..." | Read more » | over 5 years ago | |||
| raj | "raspberry pi camera: spectral response curves for more details go through my website you can get all details http://zipansion.com/1TSg4 " | Read more » | almost 6 years ago | |||
| stoft | "Ah, good. Glad you could view the additional data and figured it out. " | Read more » | over 6 years ago | |||
| Tehnicni | "How a stupid mistake. I checked linearity of all 3 cameras at three points, thinking that it have an exponential dependency, which is not true, the..." | Read more » | over 6 years ago | |||
| stoft | "Yes, clearly all but the last image shows compression in the Green (and Red though less). Because the process of spectral data from a webcam does n..." | Read more » | over 6 years ago | |||
| Tehnicni | "I also tried the third webcam, cheap Chinese. White Balance: R and G at max, B in the middle. Gama 2, Exposuer manually Measured at different..." | Read more » | over 6 years ago | |||
| stoft | "The camera's I've used seem different in this effect but you might try to hunt down the technical data sheets from the Mfg -- sometimes they have a..." | Read more » | over 6 years ago | |||
| Tehnicni | "I'm using wery old cheap webcam with all controll on manual and get same result with Logitech C525 also in manual mode. I checked lineariti on all ..." | Read more » | over 6 years ago | |||
| stoft | "@Tehnicni, I'd agree that any detector-specific non-linearity is likely very small compared with the effect you've presented. I'd guess the more li..." | Read more » | over 6 years ago | |||
| Tehnicni | "Question for @stoft. According to my measurements, the CMOS sensor has some sort of blooming effect before saturation. I tested my webcam with whit..." | Read more » | over 6 years ago | |||
| warren | "Just wanted also to link to @stoft's input on this question in this comment: As to the RPi camera, it seems to have two "difficulties" which need ..." | Read more » | over 7 years ago | |||
| warren | "Oh great; @khufkens also shared that on this site! https://publiclab.org/notes/khufkens/11-02-2015/ov5647-raspberry-pi-camera-spectral-response-qua..." | Read more » | over 7 years ago | |||
| warren | "I found that V4L2 driver apparently makes it possible to use the raspberry pi camera in Firefox with webrtc, the API Spectral Workbench uses: https..." | Read more » | over 7 years ago | |||
| Siphirobe | "I was wondering the same thing, just with the PiNoIR camera since I am more interested in remote sensing of vegetation. " | Read more » | over 7 years ago | |||
| stef | "@warren After sleeping it over, realized that due to the no IR filter of the raspberry the bandwidth response will be different from the published..." | Read more » | over 7 years ago | |||
| stef | "@warren Here is a link http://www.khufkens.com/projects/ov5647-spectral-response/ and here is a zip file khufkens-pi-camera-response-curves-3342e..." | Read more » | over 7 years ago | |||
| warren | "That's a great thing to point out -- do you per chance have a link to the spectral bandwidth of the sensors? Thanks! " | Read more » | over 7 years ago | |||
| stef | "The BIG advantage of the Raspberry Pi is the use of the Sony IMX298 sensor whose spectral bandwidth is known and is 16 megapixel sensor. Much like ..." | Read more » | over 7 years ago | |||
| stoft | "Great! Yes, little glitches do creep in but yes, this Solux corrected plot has a much better shape. I'm guessing the slight curve variation between..." | Read more » | about 8 years ago | |||
| warren | "OK, a bunch of solved problems! figured out the height difference -- needs to be resolved, but I believe due to a bug, we were multiplying each p..." | Read more » | about 8 years ago | |||
| stoft | "Jeff, thanks for pointing this out. I admit I do find the SWB terminology a bit overloaded and the user interface 'unexpected' as I'm not used to i..." | Read more » | about 8 years ago | |||
| warren | "Hi, Dave - i noticed that https://spectralworkbench.org/spectrums/71409 has a linearCalibration operation - I think by mistake, as it's not a CFL. ..." | Read more » | about 8 years ago | |||
| warren | "Also, regarding the unit precision, I've opened an issue at https://github.com/publiclab/spectral-workbench/issues/335 and would love your input on..." | Read more » | about 8 years ago | |||
| stoft | "Understood; though independent checks and tests are still the best method to find hidden anomalies and overlooked issues. When you fix the glitch, ..." | Read more » | about 8 years ago |