Thats great, thanks for the help.

G

Out of interest have you checked to see how uniform the heat distribution is on the plate? Or do the three of those heating pads completely cover the back of the plate to mitigate that issue?

Hi Stub, Apologies for the endless stream of questions, can I ask what sort of a heater element are you using? Is it a cartridge heater or some form of a ptc heating element which seem to be the more power efficient option. I had initially thought of using a cartridge heater but a ptc heating elemen...

Yes I think I see where your coming from now...the 20 degree blackbody may need to be cooled as opposed to heated if the ambient temperature is too high. Another thing to think about!

Thanks,
G

Hi, The ambient temperature of the scene will probably fluctuate around 25 - 30 degrees for the most part but the outer limits are 20 and 40. Given space constraints both blackbodies would be relatively close together. But to answer your question no the ambient temperature wouldn't/shouldn't be less...

Hi Stub,

Another quick question for you, do you know what the power draw/usage is for the blackbody your using?

Kind regards,
G

Hi,

I'll definitely let you know if it works/if I get a chance to do it.

Thanks,
G

Hi Stub, Apologies, I have another question, what thickness is the steel you are using, you mentioned on your website it takes roughly 10 minutes for the temperature to stabilise. I'm not sure what way your blackbody works but I'm thinking of using a PID controller along with the SSR, a couple of ca...

Hi Stub, Thanks for your help. I'm going to try create a blackbody myself as opposed to my current approach of improving temperature accuracy which was to alter the flux linear parameters on the Lepton and generate a calibration function which compared the output of the camera looking down at a cont...

Hi Stub, In terms of the blackbody itself, are you using a solid state relay to control the constant temperature? What material are you using for the surface out of interest, I know most metallic surfaces can be made into good emitters using paints. I was actually thinking of having two black body s...

Hi Stub, I appreciate your help on this matter. Do you basically use the following logic and say if the colour thresholds representing the blackbody @ 37.8 degrees is greater than the colour threshold of somebodies face then they do nothing otherwise trigger an alarm? In my case I am not doing eleva...

Hi Stub,

So your using the blackbody as a reference point within the image or am I wrong in saying that?

Did you manufacture the blackbody yourself, if so can you elaborate on that process?

Thanks,
G

Hi Stub, You mentioned that you had developed a low cost blackbody. I have designed and built a low cost black body - if you need one to help with this process please let me know. I was wondering if you could elaborate on that? Have you used it to calibrate a Lepton 3.5 and if so what sort of measur...

Hi kwagyeman

Just curious if theres any update on this

Regarding the 14-bit data any. I has a todo list task to support the FLIR Lepton in the FIR module. When this is done you will be able to get the 14-bit image. However, don't expect this for a few months.

Thanks
G

Hi, Im just wondering if you can help me read/interpret the FFC settings from section 4.5.16 https://www.flir.com/globalassets/imported-assets/document/flir-lepton-software-interface-description-document.pdf. I want to get the current settings and print them but I seem to be getting unusual values. ...

Hi, I think Nyamekye already answered this you cant index like that, python doesn't know what structure your trying to use. If you want to use a list you need to define it as mylist = [] for example before you use it. Then you can Insert a value into a certain index position of the list using the fo...

Thank you.

Hi, I'm just wondering if its possible to stream thermal images from the OpenMV H7 + Flir Lepton 3.5 to my host which is a raspberry pi. Can the openmv stream/push the images to the host device via usb without the need for the raspberry pi needing to request the openmv board to take a snapshot. The ...

Yeah no problem. I won't get to it immediately as I have a few other features to develop first but when I eventually get it done I'll post the code. Thanks

Hi, Possibly a foolish question but do you think there is any reason why the openmv board couldn't be used to calibrate the lepton 3.5 as per the Flir guide https://www.flir.com/globalassets/imported-assets/document/lepton-with-radiometry-quickstart-guide.pdf . I know it mentions communicating with ...

Hi, I thought this might be useful if someone like me wants the raw data or the reassurance that the 8 bit conversion the OpenMV board does is still quite accurate. I done two comparisons. The top comparison uses the Flir radiometric ROI SDK function to return the average temperature in Kelvin scale...

Given that my array is full of 16 bit data I tried packaging it as .pgm file but when reading on the host device it see's them as 8 bit values for some reason.

Hi,
Just to let you know I got this working using the shared folders approach as per your documentation. The one thing I did notice is when I run the boot loader to update the firmware the Cam has to be disconnected from the ide before I try do it which I never noticed before.

Hi, How do i send an array of values to a raspberry pi as opposed to an image object? I have it working for an image object its more how do I package the array. So I have my "img" which is actually an array of 16 bit values but I am not entirely sure how I send those back to the host device. I store...

Hi, Just to let you know, and for anyone else that may need it, I got the spotmeter stuff working. There were two things happening. I had to put a time.sleep(500) between the setting of the ROI and the getting of the ROI to allow the changes to take effect. The other thing I wanted was to set the RO...

Hi, I'm trying to upload some firmware changes on the H7. I have done this several times before and it has worked fine. The only difference now is im trying to do it on a virtual machine, specifically on Ubuntu 14.04 (Guest OS) with the host OS being Windows 10. When I go to run the bootloader and t...

Yes I'll have a look. I also agree that the Flir documentation is quite poor given the complexity of the subject matter. Thank you.

Hi,

I have the 3.5. I can set the coordinates and get the coordinates to make sure they are set to mine but when I query the ROI for min, max, avg temp and population it seems to be based off of other coordinates as far as I can see.

Hi, When I issue the rad spot-o-meter set command with the following values I get a sensor control failed error. The code I use is: roi = struct.pack("<HHHH", 0,0,159,119) # defining rectangle coordinates and putting in structure sensor.ioctl(sensor.IOCTL_LEPTON_SET_ATTRIBUTE, 0x4ECD, roi) data = se...

Hi,

When you have an image object and you index into it to get a pixel value, where is the source code that executes that operation out of interest?

Hi, I completely misread one of your earlier responses in this thread which is why I got so confused. You said in non measurement mode the sensor runs an algorithm called AGC which adaptively scales the 14-bits to 8-bits using a method that changes per area of the image . I have since looked at the ...

Hi,

Yes thats fine once i have the use of the print statement I will probably figure it out myself. Cheers.

Hi,

I have made changes to the firmware and uploaded them onto the H7. The camera seems to be stuck on the self test I see no blue light flashing? How long should it take?. Also is it possible to see the output of print statements in the firmware for debugging purposes.

Hi Iseeinir23, I'm definitely not an expert but it sounds like you need to calibrate the lepton off a black body source. The camera should be doing FFC automatically so the core temperature of the camera shouldn't be an issue. The lepton is calibrated at factory for a scence with 100% emissivity in ...

Hi, I would like to summarise my understanding of this code and see If you can tell me whether I am on the right lines or not: int value = __REV16(row_ptr[fast_floorf(x * scale_inv)]); if (measurement_mode) { // Need to convert 14/16-bits to 8-bits ourselves... if (!radiometry) value = (value - 8192...

Hi, So I had the temperature settings set at -10 and 140 which by my calculations would result in a possible loss of precision of approximately 0.58C in an 8 bit greyscale image, is that correct? I didn't intend on leaving the temperature window that wide going forward anyway but I didn't realise it...

Yes maybe your right, I'm just trying to understand it which the source code definitely helped with. The critical temperature range is 20 to 40 degrees, you wouldn't really want a server reaching 40 degrees anyway.

Yes I saw it. The spot meter requires me to give it the coordinates of an area I want to check. In terms of a server rack I cant say the hotspot will always be at a specifc point, hence why I wanted the raw data as well as an 8 bit greyscale image. We would then implement our own hotspot detection c...

Hi I would like to access the raw temperature data the camera produces I understand that I would still need to convert it to 8 bit or whatever for display purposes. So in short I would like to have an array of raw temperature values and the 8 bit greyscale image. I understand what you mean about con...

Hi, Is the logical AND of value and 0xff in the switch statement where the 14 bit to 8 bit conversion is actually happening. I had a quick look at the code and specifically looked up the 0xff operator which gives you the last 8 bits of the value. The code I'm looking at is here: IMAGE_PUT_GRAYSCALE_...

Hi,

Im just wondering if you ship products to Ireland the shipping calculator on your website doesn't show Ireland as an option and I'm pretty sure it used to. I just want to make sure before buying. Thanks

Hi,

Could you provide me with a link to the file that scales the data from 14 bit to 8 bit please? I would like to look at the source code as it seems I will need to edit it to get the radiometric data that I require.

Hi, By converting from 14 bit to 8 bit is the radiometric aspect lost? So really in the current implementation of the Lepton code you provide, it doesn't make use of the radiometric aspect of the camera? I'm not sure I fully understand your explanation. Does that mean then the map_g_to_temp() functi...

Apologies for coming back to this question so soon but I was reading an article on compression of thermal images https://irinfo.org/04-01-2006-colbert/ that says The JPEG image file, commonly used for photographs and other complex still-images on the Web, is an image that has lossy compression.....N...

Hi, Its probably not the right place to be asking the question but I'm struggling to find a specific answer, how does a radiometric lepton (3.5) differ from a non-radiometric. More specifically when reading about radiometric measurement it says each pixel can be interpreted as a temperature value. W...

Thats great, thank you.

So in my case I set the min temperature to -10 and the maximum temperature to 140. I then set the minimum greyscale value to 0 and the maximum value to 255. If I compress an image that has been taken using these settings can I interpret a pixel as temperature value using your function in a post proc...

Hi

Quick question, is it possible to send the thermal image back to a device without compressing it? My understanding is that if I want to gather temperature values from the image in a post processing stage then I can't compress the image?

Thanks,
Gar

Ok thanks for your help, it's much appreciated

So am I correct in saying then that the example code in the IDE which draws before generating the stats is incorrect, or at least for my use case where I need the temperature. I understand that you feel I'm overthinking what's happening, but from my point of view I need to understand if the data I h...