| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| warren | "Hi! There's quite a bit on this at #intensity-calibration to dig into, great question! Thanks!!! " | Read more » | over 5 years ago | |||
| 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 » | about 6 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 » | over 6 years ago | |||
| warren | "There's some guidance here, but it may be out of date: https://publiclab.org/wiki/spectral-workbench-usage#Webcam+configuration -- this'd be a good..." | Read more » | almost 8 years ago | |||
| idev247 | "Very good point @cfastie. Anyone know if the webcam that comes with the "Desktop Spectrometry Kit 3.0" has a fixed exposure and white balance? " | Read more » | almost 8 years ago | |||
| cfastie | "There is one more issue to be aware of. In addition to automatic exposure, most simple cameras have automatic white balance. Automatic white balanc..." | Read more » | almost 8 years ago | |||
| idev247 | "Interesting. Thanks @cfastie and @warren. The answers seem to agree that the spectrometer might indeed be the right type of tool to measure color o..." | Read more » | almost 8 years ago | |||
| idev247 | "I haven't bought a lux meter yet but what you mentioned is interesting. I could use the lux amount as a variable when doing the spectrometer measur..." | Read more » | almost 8 years ago | |||
| warren | "Ah, Chris reminds me of an additional way to control camera gain control -- use a camera, like the Raspberry Pi camera, where you can more tightly ..." | Read more » | almost 8 years ago | |||
| cfastie | "Wow, the Phillips Hue is a 15 dollar LED light bulb with a wifi module. It requires a proprietary wifi router (~$40). The free app can control up t..." | Read more » | almost 8 years ago | |||
| warren | "Oh, interesting -- curious about your lux meter --- cost or link to buy one? You could use it perhaps to confirm that you're reading equal amounts ..." | Read more » | almost 8 years ago | |||
| idev247 | "The divider is definitely an interesting idea. I've been looking around and maybe I could use two tools: A lux meter for brightness, and the spectr..." | Read more » | almost 8 years ago | |||
| idev247 | "I'll still researching. Based on what I found I'm probably better off getting a lux meter for brightness, and maybe the spectrometer for color spec..." | Read more » | almost 8 years ago | |||
| warren | "Hi, I think the spectrum comparisons would be relatively straightforward -- but keep in mind that the kit requires a calibrated reference light to ..." | Read more » | almost 8 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 » | about 8 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 » | about 8 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 » | about 8 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 » | about 8 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 » | about 8 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 » | about 8 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 » | about 8 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 » | about 8 years ago |