Show your support for community science. Donate to Public Lab »


Comments

Author Comment Last activity Moderation
khufkens "Thanks for the contributions as well!! " | Read more » about 4 years ago
khufkens "thanks @matthew, seems like you have to include http otherwise the markup thinks it's an internal references. " | Read more » about 4 years ago
khufkens "http://www.flir.com/uploadedFiles/CVS_Americas/Cores_and_Components_NEW/Resources/flir-lepton-datasheet.pdf : says, 8 to 14 μm which seems to be to..." | Read more » about 4 years ago
khufkens "@marlokeno It's not cheap (although it's $100 than it used to be, mmm) but it sure is DIY and within the larger amateur budget. https://www.sparkf..." | Read more » about 4 years ago
khufkens "On the raspberry pi camera there is no real focus, so you either unscrew the lens assembly (google macro lens / macro photography and raspberry pi ..." | Read more » about 4 years ago
khufkens "I assume the optical properties of the chip should be relatively consistent, however optics might interfere a bit (create wavelength dependent loss..." | Read more » over 4 years ago
khufkens "Further, note that these values are scaled between 0-100% while the true QE peaks at an efficiency of 53.6% in the blue channels respectively. Rela..." | Read more » over 4 years ago
khufkens "Side note: the above assumes that the OmniBSI chipset as displayed in the documentation is the one residing in the OV5647, which is highly likely b..." | Read more » over 4 years ago
khufkens "What is described above is hardware development approached as current day software development. You have a main trunk (project lead) which is forke..." | Read more » over 4 years ago
khufkens "Ah, right around my corner. Nice... " | Read more » over 4 years ago
khufkens "I'm busy with work for the moment and have little time for my side projects. I'll probably pick it up again somewhere in autumn. I contacted some p..." | Read more » over 4 years ago
khufkens "Questions: What is your input and can you show the input data as well (mainly the red and near infrared images)? What software did you use to con..." | Read more » over 4 years ago
khufkens "@cfastie, thanks for this write-up on some of the issues that plague the cheaper approaches to VI. I'm not sure people are aware of this and this m..." | Read more » over 4 years ago
khufkens "Good point, I might use this approach to see if I can get better results on my PRI sensor. Things were funky and this offset in response (differenc..." | Read more » over 4 years ago
khufkens "This is again a reason why you would want to know the spectral response of most imaging sensors. Without this information it will require field val..." | Read more » over 4 years ago
khufkens "I'm not sure how you want to build an IR spectrometer using this method. I highly suggest reading the general description on infrared spectroscopy ..." | Read more » over 4 years ago
khufkens "@gbathree, this wasn't as much a critique on the technique, but personal experience has taught me that you have to be really picky on how you alloc..." | Read more » over 4 years ago
khufkens "As far as I understood is the value light use efficiency value (LUE / phi2) you measure by using PAM fluorescence (LUEpam) conceptually the same as..." | Read more » over 4 years ago
khufkens "I'm confused by the goal of the experiment. Would just measuring Fv/Fm / or related values on a dark adapted leave not be quicker and more accurate..." | Read more » over 4 years ago
khufkens "I just checked the float image I created earlier this week and it seems that all negative values are clipped on my float images as well, leaving th..." | Read more » almost 5 years ago
khufkens "Also have a look at the histograms of both initial float images. You might be stretching your data somehow, leaving the majority of the pixels blac..." | Read more » almost 5 years ago
khufkens "Do you pull those into an application which can handle images with floats? To make sure if both images are the same just plot them in a scatter plo..." | Read more » almost 5 years ago
khufkens "Thanks @cfastie for reminding me of the Raleigh scattering, my equally scattered Sunday evening brain didn't quite put two and two together. The re..." | Read more » almost 5 years ago
khufkens "Thanks Mathew for the link back! The whole package should work perfectly now, I'm still working on implementing the input output part, where I can..." | Read more » almost 5 years ago