Benjamin Meltzer
  • Male
  • South Africa
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  • Deon van der Merwe

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Benjamin Meltzer's Discussions

Removing Rolling Shutter Artifacts

Started this discussion. Last reply by kiki boy Sep 29, 2016. 2 Replies

HiI am looking to use drone captured data to map out areas.I am seeing rolling shutter artifacts from the sensor system I am using. This impacts our photogrammetry and massively degrades the…Continue

Tags: drone, mapping, shutter, rolling

Open Drone Map alternative

Started Sep 27, 2016 0 Replies

HiI am looking for an open source option to stitch aerial data (into orthomosaics, point clouds and DEMs) I have noticed that OpenDroneMap is not being maintained. Are there any alternatives, that…Continue

Tags: stitching

Stitching Aerial Thermal Imagery

Started this discussion. Last reply by Giovanni - iGV Aug 30, 2016. 1 Reply

Does anyone know if it is possible to stitch aerial thermal imagery without losing radiometric temperature data? I am looking to generate a thermal orthomosaic.Continue

 

Benjamin Meltzer's Page

Latest Activity

Dennison replied to Benjamin Meltzer's discussion NDVI NGB Modified Camera Configuration in the group Agricultural UAVs
"Due to the mii scattering effect of blue light, it is going to be difficult to normalize a ngb image from the day to day. I suggest trying to use a calibration board to normalize the nir and green bands and hope the variations in blue light received…"
Mar 31
kiki boy replied to Benjamin Meltzer's discussion Removing Rolling Shutter Artifacts
"Pix4d simply cut one picture in multiple pictures. But there is interpolation between pixel so results could be as good as you could have with global shutter or good sensor readout"
Sep 29, 2016
matt.koestner replied to Benjamin Meltzer's discussion Removing Rolling Shutter Artifacts
"In my experience this can be solved by damping the vibrations before they make it to the camera.  And it's not only spinning things that can cause the problem but flexible frame parts are just as important if not more so.  I'm…"
Sep 27, 2016
Benjamin Meltzer posted discussions
Sep 27, 2016
Giovanni - iGV replied to Benjamin Meltzer's discussion Stitching Aerial Thermal Imagery
"Hello Benjamin; not sure it's too late to reply to your post, but I just signed up to DIY Drones  :-) I've been working on this subject for some time now (I'm also a Certified Level 2 thermography operator) conducting UAV surveys…"
Aug 30, 2016
Benjamin Meltzer posted a discussion

Stitching Aerial Thermal Imagery

Does anyone know if it is possible to stitch aerial thermal imagery without losing radiometric temperature data? I am looking to generate a thermal orthomosaic.See More
Aug 8, 2016
Benjamin Meltzer replied to Benjamin Meltzer's discussion NDVI NGB Modified Camera Configuration in the group Agricultural UAVs
"We are currently attempting this method. As Deon suggested it is obviously more computationally intensive however we do expect the results to drastically improve our NDVI images. We are looking to use image-registration algorithms to produce…"
Dec 12, 2014
Benjamin Meltzer replied to Benjamin Meltzer's discussion NDVI NGB Modified Camera Configuration in the group Agricultural UAVs
"Thanks for your detailed response, Deon"
Dec 12, 2014
Deon van der Merwe replied to Benjamin Meltzer's discussion NDVI NGB Modified Camera Configuration in the group Agricultural UAVs
"It is possible to use two cameras. We started with that method. However, it is a challenge to obtain precise synchronization between the cameras, it makes data processing more difficult, and it is not a complete solution in terms of band…"
Dec 11, 2014
Jacko replied to Benjamin Meltzer's discussion NDVI NGB Modified Camera Configuration in the group Agricultural UAVs
"It's been suggested to use a second RGB camera (unconverted) camera triggered and the same time and use the red from that. Do you think this would improve things towards a true NDVI?"
Dec 11, 2014
Deon van der Merwe replied to Benjamin Meltzer's discussion NDVI NGB Modified Camera Configuration in the group Agricultural UAVs
"Benji, You are seeing some of the complexities associated with using converted "NDVI" cameras. It does not make the data useless, but you have to take the limitations into consideration. One of the important factors to realize is that the…"
Dec 11, 2014
Benjamin Meltzer added a discussion to the group Agricultural UAVs
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NDVI NGB Modified Camera Configuration

Good morning everyoneWe have recently purchased a NGB converted camera (NIR, G and B channels) with the goal of observing different vegetation indices (DVI, NDVI, SAVI, etc) from UAV-captured images. We were hoping some of you may have some tips on calibrating the camera settings to optimise these images (NDVI in particular).We have found that the NDVI (and DVI, as expected) images vary immensely in different light conditions and for different camera settings. This is far from the…See More
Dec 11, 2014
Vega Tech Group LLC replied to Benjamin Meltzer's discussion NIR Camera vs RGB Camera Conversion in the group Agricultural UAVs
"Michal, You are correct. One prism was without imaging sensors, the other two had the sensors attached to the output faces. The prisms in the images were designed and manufactured by Optec, SpA(www.optec.eu). Complete prism cameras using Optec,…"
Nov 1, 2014
Michal Rus replied to Benjamin Meltzer's discussion NIR Camera vs RGB Camera Conversion in the group Agricultural UAVs
"Could you please provide a link where these prism cameras for UAVs are sold ? Because what you provided is the sensor only.. Thanks"
Nov 1, 2014
Vega Tech Group LLC replied to Benjamin Meltzer's discussion NIR Camera vs RGB Camera Conversion in the group Agricultural UAVs
"What region of the infrared are you working? NIR(700-900nm), SWIR(900-2500nm), MWIR(2.5um-7um), LWIR(7um-14um) There are integrated solutions for all regions, with Visible sensors, Including Image Fusion."
Nov 1, 2014
Vega Tech Group LLC replied to Benjamin Meltzer's discussion NIR Camera vs RGB Camera Conversion in the group Agricultural UAVs
"You say you don't want to spend too much? Well that may be a real issue. To be successful, the imaging system is of the utmost importance. The issue at hand is that off the shelf consumer grade cameras used are not designed for data analysis,…"
Nov 1, 2014

Profile Information

About Me:
Mechatronics Engineer (BSc)
Neurotechnology Engineer (MSc)
Please tell us a bit about your UAV interest
Aerobotics (www.aerobotics.co.za) founder, looking to develop agricultural UAV technology and services. Including the hardware and software development
Hometown:
Cape Town

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