Author Topic: Opgal Therm-App - first smartphone thermal imager to ship  (Read 59496 times)

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Offline mikeselectricstuff

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Re: Opgal Therm-App - first smartphone thermal imager to ship
« Reply #25 on: November 14, 2014, 03:10:36 pm »
Prices are good, I'd consider one but I'm unsure of what the extra customs charges would be on top for the UK. Any UK member with one?
Probably mostly 20% VAT, plus £5-20 clearance charge depending on carrier
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Offline yogort1

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Re: Opgal Therm-App - first smartphone thermal imager to ship
« Reply #26 on: February 17, 2015, 06:32:15 pm »
Well, it's been a while since last post in this thread :P
Any ideas on what kind of sensor they used behind the lens? My question applies to 'Seek Thermal' and 'Flir One' devices as well. I've sent an inquiry to Ulis thermal sensors distributor and the cheapest 80p resolution thermal sensor is for 300€, so the price of the sensor alone exceeds the whole price of Seek and F1. I saw some graphs presenting that CCD and CMOS camera sensors are able to detect the mid-infrared waves used in thermal imaging when you remove their filters and leave only bare sensor. Then it is only a matter of trimming the wave spectrum.
I took one of my CCD cameras and removed all that was between lens and sensor surface. Then I took my 19mm germanium lens that I'm using with my thermal camera aaaand... nothing happened. I'm afraid that germanium just cuts too much spectrum. Right now I'm planning to do the same thing but with Umicore lens (which, by the way, are bloody difficult to acquire). Any thoughts?
 

Offline encryptededdy

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Re: Opgal Therm-App - first smartphone thermal imager to ship
« Reply #27 on: February 19, 2015, 09:34:08 am »
The FLIR One uses a FLIR Lepton sensor, while Seek uses their own sensor, licensed from / made by Raytheon.
 

Offline encryptededdy

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Re: Opgal Therm-App - first smartphone thermal imager to ship
« Reply #28 on: September 10, 2015, 10:56:22 am »
For anyone considering a Therm-App for electronics work, here is a demonstration of the closest macro focus achievable with the stock lens. It's of a Samsung mSATA SSD, approx 50mm across.

 

Offline mikeselectricstuff

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Re: Opgal Therm-App - first smartphone thermal imager to ship
« Reply #29 on: September 10, 2015, 01:14:15 pm »
As the lens is interchangeable can you not just screw it out a bit to get closer focus?
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Offline encryptededdy

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Re: Opgal Therm-App - first smartphone thermal imager to ship
« Reply #30 on: September 10, 2015, 02:11:42 pm »
As the lens is interchangeable can you not just screw it out a bit to get closer focus?
Yeah, that's literally how you focus. The photo was take with the lens screwed out as far as it would go before falling out.

It is possible to get even closer macro by reversing the lens, and holding it up to the sensor - I'll post a picture later.
 

Offline nuno

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Re: Opgal Therm-App - first smartphone thermal imager to ship
« Reply #31 on: September 10, 2015, 07:51:51 pm »
For anyone considering a Therm-App for electronics work, here is a demonstration of the closest macro focus achievable with the stock lens. It's of a Samsung mSATA SSD, approx 50mm across.
(...)
Good test, I'll try something similar with the CEM.
 

Offline encryptededdy

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Re: Opgal Therm-App - first smartphone thermal imager to ship
« Reply #32 on: September 11, 2015, 05:03:35 am »
Reversed lens test



« Last Edit: September 11, 2015, 05:57:47 am by encryptededdy »
 

Offline encryptededdy

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Re: Opgal Therm-App - first smartphone thermal imager to ship
« Reply #33 on: September 13, 2015, 03:01:05 am »
Inside the Therm-App (pictures not mine).




 

Offline Fraser

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Re: Opgal Therm-App - first smartphone thermal imager to ship
« Reply #34 on: September 13, 2015, 03:23:06 am »
Those pictures show a conventional high quality microbolometer capsule. The ULIS PICO 384 is a well proven array. No wonder the Therm-app provides decent images. It looks to be a very nice design.

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Offline encryptededdy

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Re: Opgal Therm-App - first smartphone thermal imager to ship
« Reply #35 on: September 17, 2015, 11:55:37 am »
With help from tomas123, I have managed to convert Therm-App files into FLIR Radiometric JPEG.

See the two attached files if you wish to mess with them. Note they have been upscaled 2x to 768x576.
 

Offline tomas123

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Re: Opgal Therm-App - first smartphone thermal imager to ship
« Reply #36 on: September 17, 2015, 12:25:57 pm »
Awesome  :-+
You took a 10 years old Flir P60 camera (weight 2.0 kg) is reference camera  :)

Please post all steps as tutorial. I will link it in my Flir link list (see my signature)


edit 18.09.2015
1. Convert your raw Therm-App image with the FLIR calibration reversed. This is done with imagemagick's convert command. The command is: convert input.png -resize 200% -flop -fx "(((17711.559/((EXP(1447.2/(((u*65536)/100)+273.15)))-0.57999998)/0.025931966)+4096))/65536" out.png

This is assuming your temperature is stored as degrees C x100. I will update this once a more completed app is avaliable that outputs raw data.

Note this also flips the image horizontally (because the raw images are horizontally flipped) and upscales 200% (because FLIR Tools can't upscale for saving).

2. Insert this raw image into the FLIR image I linked above. This is done with a php script called "splitjpg.php" created by tomas123. It was originally intended for use with stitching FLIR camera panoramas in external software. You can download it here: https://www.eevblog.com/forum/testgear/flir-e4-thermal-imaging-camera-teardown/?action=dlattach;attach=76829

Please note you will need php installed for this. Now run "php splitjpg.php -i flir1.jpg -r out.png -o flirout", where flir1.jpg is any of the files that I've posted here, out.png is the image outputted by imagemagick, and flirout (.jpg will be added automatically) is the resulting file that can be opened with FLIR Tools. Please note the preview image on the file will be incorrect - this will be corrected once we open it in FLIR Tools.

3. Open the file with FLIR Tools. Press "auto" for scaling, as right now it's reading some predefined data from the file for the range which is wrong. Then, press save. The jpg will now carry the correct preview image and you can now begin using FLIR Tools to add measurements or create a report.

some background informations:

the necessary paramaters for -fx formula you get from the reference image
Code: [Select]
>exiftool -Planck* -Object* -Emis* -Reflected* flir1.jpg
Planck R1                       : 17711.559
Planck B                        : 1447.2
Planck F                        : 0.57999998
Planck O                        : -4096
Planck R2                       : 0.025931966
Object Distance                 : 0.00 m
Emissivity                      : 1.00
Reflected Apparent Temperature  : 20.0 C

the -fx formula is the rearranged equation to calculate the temperature from Flir-RAW value and "Planck Values".
RAW=f(Temperature_Object, Reflected_Apparent_Temperature, Planck_Values)
see my excel sheet for understanding
- https://www.eevblog.com/forum/testgear/flir-ex-realtime-raw-radiometric-data-streaming-via-uvc/msg744673/#msg744673
- https://www.eevblog.com/forum/testgear/flir-e4-thermal-imaging-camera-teardown/msg342072/#msg342072
« Last Edit: September 18, 2015, 05:00:39 pm by tomas123 »
 

Offline amyk

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Re: Opgal Therm-App - first smartphone thermal imager to ship
« Reply #37 on: September 17, 2015, 01:42:00 pm »
384x288 at 25Hz... interestingly, no mention of that model being export-restricted besides a vague disclaimer in their license agreement. Then again, they are in Israel and not the US.

You can also buy one of these from China...
 

Offline encryptededdy

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Re: Opgal Therm-App - first smartphone thermal imager to ship
« Reply #38 on: September 17, 2015, 02:05:57 pm »
1. Convert your raw Therm-App image with the FLIR calibration reversed. This is done with imagemagick's convert command. The command is: convert input.png -resize 200% -flop -fx "(((17711.559/((EXP(1447.2/(((u*65536)/100)+273.15)))-0.57999998)/0.025931966)+4096))/65536" out.png

This is assuming your temperature is stored as degrees C x100. I will update this once a more completed app is avaliable that outputs raw data.

Note this also flips the image horizontally (because the raw images are horizontally flipped) and upscales 200% (because FLIR Tools can't upscale for saving).

2. Insert this raw image into the FLIR image I linked above. This is done with a php script called "splitjpg.php" created by tomas123. It was originally intended for use with stitching FLIR camera panoramas in external software. You can download it here: https://www.eevblog.com/forum/testgear/flir-e4-thermal-imaging-camera-teardown/?action=dlattach;attach=76829

Please note you will need php installed for this. Now run "php splitjpg.php -i flir1.jpg -r out.png -o flirout", where flir1.jpg is any of the files that I've posted here, out.png is the image outputted by imagemagick, and flirout (.jpg will be added automatically) is the resulting file that can be opened with FLIR Tools. Please note the preview image on the file will be incorrect - this will be corrected once we open it in FLIR Tools.

3. Open the file with FLIR Tools. Press "auto" for scaling, as right now it's reading some predefined data from the file for the range which is wrong. Then, press save. The jpg will now carry the correct preview image and you can now begin using FLIR Tools to add measurements or create a report.
 

Offline encryptededdy

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Re: Opgal Therm-App - first smartphone thermal imager to ship
« Reply #39 on: September 17, 2015, 02:08:20 pm »
I wonder if anyone working on a Seek thermal SDK or PC app wants to try to implement this for the Seek.
 

Offline nuno

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Re: Opgal Therm-App - first smartphone thermal imager to ship
« Reply #40 on: September 17, 2015, 07:45:07 pm »
I can see in the images and video that there's some vertical "stripe noise" that is static, you should be able to remove that with a "dark frame".
 

Offline encryptededdy

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Re: Opgal Therm-App - first smartphone thermal imager to ship
« Reply #41 on: September 17, 2015, 08:14:52 pm »
I can see in the images and video that there's some vertical "stripe noise" that is static, you should be able to remove that with a "dark frame".
Yes I am aware of that. However unfortunately the stripe noise changes slightly depending on the temperature of the target, which makes removing it harder.
 

Offline nuno

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Re: Opgal Therm-App - first smartphone thermal imager to ship
« Reply #42 on: September 17, 2015, 09:19:44 pm »
In form/location or/and intensity? Global intensity of individual noise pixels change?

Edit: I'm looking at mine (a CEM) and it has that "dark frame" too.
« Last Edit: September 17, 2015, 09:21:23 pm by nuno »
 

Offline encryptededdy

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Re: Opgal Therm-App - first smartphone thermal imager to ship
« Reply #43 on: September 17, 2015, 09:42:55 pm »
In form/location or/and intensity? Global intensity of individual noise pixels change?

Edit: I'm looking at mine (a CEM) and it has that "dark frame" too.
Intensity. I'm sure it's removable with some work in the SDK.
 

Offline encryptededdy

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Re: Opgal Therm-App - first smartphone thermal imager to ship
« Reply #44 on: September 19, 2015, 08:06:01 am »
A ~3000x1000 resolution, fully radiometric, panorama.

1. Stiched RAW images with ICE, output PSD
2. Filled in missing space with Photoshop content aware fill
3. Imagemagick converted image to 8bit scaled PNG.
4. Lightroom noise reduction on said 8bit PNG
5. Imagemagick convert lightroom output back into 16bit RAW PNG
6. Imagemagick convert RAW PNG into FLIR RAW PNG.
7. PHP splitjpg.php to embed FLIR RAW PNG into a FLIR radiometric JPEG.
8. FLIR Tools to add measurements and generate final output.

Noise reduction was necessary as the ~6 degrees C span had a bit of noise.


(non-radiometric preview)

Fully radiometric version, FLIR Radiometric JPEG: http://puu.sh/kgu8H/b1023306ce.jpg

For those wondering, here is the raw version built straight from raw files without noise reduction (this one has a lower 4 degrees C span):


Still usable, not as nice looking.
« Last Edit: September 19, 2015, 08:09:33 am by encryptededdy »
 

Offline encryptededdy

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Re: Opgal Therm-App - first smartphone thermal imager to ship
« Reply #45 on: September 24, 2015, 10:07:17 pm »
Macro shots of my PC motherboard. Ignore the FLIR logo  ;)





 

Offline tomas123

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Re: Opgal Therm-App - first smartphone thermal imager to ship
« Reply #46 on: September 25, 2015, 10:07:24 am »
 :-+ :-+
How do you mount the reversed lens?

Are you processed the images with a noise reduction like in your panorama workflow?
Compared with your first image, there are no stripes



panorama images:
I think, your LR 8 bit intermediate step is not the best solution  ;)
« Last Edit: September 25, 2015, 10:10:54 am by tomas123 »
 

Offline tomas123

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Re: Opgal Therm-App - first smartphone thermal imager to ship
« Reply #47 on: September 25, 2015, 10:15:36 am »
off topic

my best Flir E40 macro without an extra lens

https://www.eevblog.com/forum/testgear/flir-e4-thermal-imaging-camera-teardown/msg363213/#msg363213
LQFP64 pin-distance: 0.5mm (16 pins at 8 mm)

unfortunately the lens of flir E40 at macro distances (0,4m) is only sharp in the center

Offline encryptededdy

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Re: Opgal Therm-App - first smartphone thermal imager to ship
« Reply #48 on: September 25, 2015, 10:21:49 am »
:-+ :-+
How do you mount the reversed lens?

Are you processed the images with a noise reduction like in your panorama workflow?
Compared with your first image, there are no stripes



panorama images:
I think, your LR 8 bit intermediate step is not the best solution  ;)
No, those are raw images from the camera. No processing or noise reduction.

I investigated the stripes and this is what it seems like is happening: When the camera is first turned on, the stripes appear for objects over ~50 degrees. However once I leave the camera on for around 5-10 minutes (I assume for the sensor to warm up), the strips disappear. After that they only appear for very hot objects (over 120 degrees or so)

EDIT: I will do a noise test and update you.
« Last Edit: September 25, 2015, 10:27:41 am by encryptededdy »
 

Offline encryptededdy

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Re: Opgal Therm-App - first smartphone thermal imager to ship
« Reply #49 on: September 25, 2015, 10:30:17 am »
Here's a picture of a pot.



As you can see, the stripes only appear for high temperature objects now.
 


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