| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| nedhorning | "Hi sujayj - I uploaded files with the target descriptions and reflectance information to my Google Drive: https://drive.google.com/drive/folders/0B..." | Read more » | over 7 years ago | |||
| sujayj | "@cfastie This is very interesting. Thank you! " | Read more » | over 7 years ago | |||
| sujayj | "@nedhorning I have been looking to carry out calibration but was halted by the expensive costs of targets. After reading through your article, I re..." | Read more » | over 7 years ago | |||
| cfastie | "Yes, we are going to change the pixel values in our photo. For each pixel in the photo we have taken of vegetation, we use the DN in the red channe..." | Read more » | over 7 years ago | |||
| richardbowman | "Hello, "Cambridge" here (though I've actually moved now). You're right, a laser diode would certainly get rid of the chromatic issues. I suspect ..." | Read more » | over 7 years ago | |||
| sujayj | "@cfastie This is a very informative article. However, It isn't clear what is to be done after obtaining the final graph as you've shown. Are we goi..." | Read more » | over 7 years ago | |||
| nedhorning | "Hi jenjimah, Testing any of these and reporting back would be worthwhile from my perspective. One word of caution is that these are very bright re..." | Read more » | over 7 years ago | |||
| jenjimah | "Hello Ned, thank you for all your work on this subject. Currently I am looking for low-cost materials that can be used as reliable standards for N..." | Read more » | over 7 years ago | |||
| bwarzak | "I agree with Chris. Narrower bands, when they are optimally centered, logically will work better, particularly because - virtually inherent with in..." | Read more » | over 7 years ago | |||
| cfastie | "Some blue filters including Wratten 47, Schott BG3, and Rosco 2007 are dual bandpass red-rejection filters. They require that blue light be used fo..." | Read more » | over 7 years ago | |||
| suman | "I have just been going through a peer reviewed journal paper named 'Monitoring plant condition and phenology using infrared sensitive consumer grad..." | Read more » | over 7 years ago | |||
| reversevector | "Since these cheap consumer cameras have a lot of NIR crosstalk, especially with small sensor cameras like the GoPro, would it be better to subtract..." | Read more » | over 7 years ago | |||
| nedhorning | "I do not have any peer-reviewed papers related to this work - sorry. Ned " | Read more » | over 7 years ago | |||
| suman | "Dear Ned, Recently i have been going through your interesting works on Infragram NDVI and calibration. I was wondering if you had a..." | Read more » | over 7 years ago | |||
| sujayj | "Thanks Chris " | Read more » | over 7 years ago | |||
| cfastie | "You can use any filter that blocks most blue and green light (all visible light other than red) and also passes a lot of near infrared light (somew..." | Read more » | over 7 years ago | |||
| platteferguson | "So my million dollar question do I buy 3 or 4 inspire 2.0 with extra batteries or go for the new Ebee SQ ag drone for 12-15k with the multi spec wi..." | Read more » | over 7 years ago | |||
| rs806 | "Okay thanks Ned! I had been wondering about the structure of the csv file since, judging from the script, it had quite a few columns of information..." | Read more » | over 7 years ago | |||
| nedhorning | "The CSV file for the R script is different form the table in the "Improved DIY NIR camera calibration" post. The CSV file has the reflectance value..." | Read more » | almost 8 years ago | |||
| rs806 | "@nedhorning Hello Ned thank you for posting the R script. I'm finding it helpful to understand the process by going through the script itself. I wa..." | Read more » | almost 8 years ago | |||
| dannysmith | "thanks @Claytonb, they seem like the way to go " | Read more » | almost 8 years ago | |||
| Claytonb | "@dannysmith -I have been using the Labsphere Permaflect coated targets http://labsphere.com/labsphere-products-solutions/materials-coatings-2/coati..." | Read more » | almost 8 years ago | |||
| dannysmith | "@Claytonb - I was just wondering if you could indicate what type of calibration targets you are using? I've been looking at targets produced by lab..." | Read more » | almost 8 years ago | |||
| cfastie | "In single-camera NIR systems with a filter that blocks all red or blue, the camera can be adjusted to emphasize the color channel capturing NIR. Th..." | Read more » | almost 8 years ago |