json.decoder.JSONDecodeError about thermal-image-analysis

[rakshith95]

If you directly get only the temperature array, I'll have to make some changes to the codes for that compatibility. Maybe I can add that option in a while, but I'll need some data to test it out.

@rsnk96 if you guys are adding features, consider this as well. Could be useful, although things like emissivity correction won't work.

[rakshith95]

Hello @Varat7v2
What version of Python are you using?
Did you run pip install -r requirements.txt?
What is the flir file you're trying to run with? This error could pop up if the file does not contain the metadata. Try running exiftool <flir_image_path> and post the output here.

[Varat7v2]

Hi @rakshith95, Yeah I did run requirements.txt and the I am using Python3.
Now it seems to be running. But its throwing some warning or error message : [W 200504 12:40:18 CThermal:87] Image seems to be corrupted. And once I select ROI region and enter, Error:ValueError: could not broadcast input array from shape (255,32,3) into shape (67,32,3) pops up. How can I solve this error?

Actually my objective is to measure temperature at the selected ROI region. Any kind of suggestions, references will be helpful to me. Thank you.

[rakshith95]

Yeah, it can be done with the Draw Areas tool. Give me a couple of hours, I'll add more detailed documentation on how to use it.

[Varat7v2]

Yeah sure. Thank you very much.

still same broadcast input array shape problem is occurring with any of the options you have provided.

[rakshith95]

@Varat7v2 Sorry for the delay, I was caught up with something else. I've uploaded an Instructions Manual in the repo wiki.

still same broadcast input array shape problem is occurring with any of the options you have provided.

What input file are you using? Can you post the exif output here?

[Varat7v2]

@rakshith95 Thank you for uploading the instructions. This is the output of exiftool <flir_image>

ExifTool Version Number : 10.80
File Name : flir_test.jpg
Directory : /home/varat/Desktop/test_flir
File Size : 222 kB
File Modification Date/Time : 2020:05:04 11:35:11+05:30
File Access Date/Time : 2020:05:04 12:36:19+05:30
File Inode Change Date/Time : 2020:05:04 11:39:07+05:30
File Permissions : rw-rw-r--
File Type : JPEG
File Type Extension : jpg
MIME Type : image/jpeg
JFIF Version : 1.01
Exif Byte Order : Little-endian (Intel, II)
Make : FLIR Systems AB
Camera Model Name : *
Orientation : Unknown (0)
X Resolution : 72
Y Resolution : 72
Resolution Unit : inches
Software : *
Modify Date : 2014:08:25 16:34:16
Y Cb Cr Positioning : Centered
Exif Version : 0220
Create Date : 2014:08:25 16:34:16
Components Configuration : -, Cr, Cb, Y
Subject Distance : 1 m
Focal Length : 1.6 mm
Image Temperature Max : 213
Image Temperature Min : 213
Flashpix Version : 0100
Color Space : sRGB
Exif Image Width : 527
Exif Image Height : 395
Digital Zoom Ratio : 1
Image Unique ID : 5DC0081B4058719A9AC19767825D6855
Compression : JPEG (old-style)
Thumbnail Offset : 1848
Thumbnail Length : 2075
Creator Software :
Embedded Image Width : 640
Embedded Image Height : 480
Embedded Image Type : JPG
Embedded Image : (Binary data 37786 bytes, use -b option to extract)
Emissivity : 0.95
Object Distance : 1.00 m
Reflected Apparent Temperature : 20.0 C
Atmospheric Temperature : 20.0 C
IR Window Temperature : 20.0 C
IR Window Transmission : 1.00
Relative Humidity : 50.0 %
Planck R1 : 16760.967
Planck B : 1431.7
Planck F : 1
Atmospheric Trans Alpha 1 : 0.006569
Atmospheric Trans Alpha 2 : 0.012620
Atmospheric Trans Beta 1 : -0.002276
Atmospheric Trans Beta 2 : -0.006670
Atmospheric Trans X : 1.900000
Camera Temperature Range Max : 120.0 C
Camera Temperature Range Min : -40.0 C
Camera Temperature Max Clip : 150.0 C
Camera Temperature Min Clip : -60.0 C
Camera Temperature Max Warn : 120.0 C
Camera Temperature Min Warn : -40.0 C
Camera Temperature Max Saturated: 150.0 C
Camera Temperature Min Saturated: -60.0 C
Camera Model : *
Camera Part Number : *
Camera Serial Number : *
Camera Software : 1.0.0
Lens Model : FOL2
Lens Part Number :
Lens Serial Number :
Field Of View : 46.1 deg
Filter Model :
Filter Part Number :
Filter Serial Number :
Planck O : -3643
Planck R2 : 0.013450708
Raw Value Median : 14980
Raw Value Range : 1768
Date/Time Original : 2014:08:25 21:34:16.490+00:00
Focus Step Count : 0
Focus Distance : 2.0 m
Frame Rate : 15
Palette Colors : 224
Above Color : 170 128 128
Below Color : 50 128 128
Overflow Color : 67 216 98
Underflow Color : 41 110 240
Isotherm 1 Color : 100 128 128
Isotherm 2 Color : 100 110 240
Palette Method : 0
Palette Stretch : 0
Palette File Name : iron.pal
Palette Name : Iron
Palette : (Binary data 672 bytes, use -b option to extract)
Raw Thermal Image Width : 160
Raw Thermal Image Height : 120
Raw Thermal Image Type : PNG
Raw Thermal Image : (Binary data 18224 bytes, use -b option to extract)
Real 2 IR : 1.21348178386688
Offset X : +17
Offset Y : -33
PiP X1 : 0
PiP X2 : 159
PiP Y1 : 0
PiP Y2 : 119
GPS Map Datum :
Image Width : 527
Image Height : 395
Encoding Process : Baseline DCT, Huffman coding
Bits Per Sample : 8
Color Components : 3
Y Cb Cr Sub Sampling : YCbCr4:2:0 (2 2)
Image Size : 527x395
Megapixels : 0.208
Peak Spectral Sensitivity : 10.0 um
Thumbnail Image : (Binary data 2075 bytes, use -b option to extract)

[rakshith95]

Okay, thank you. Not able to find anything wrong with it. Can you post the error log when you run it?

[Varat7v2]

Hey @rakshith95 I am using PureThermal 2 - FLIR Lepton camera for thermal imaging. But when I capture the image, lot of meta-data are missing. How can I capture image or use my camera to make it compatible with thermal imaging? When I run exiftool <on-my-image> its just showing the following details:

ExifTool Version Number : 10.80
File Name : my_photo-1.jpg
Directory : .
File Size : 5.7 kB
File Modification Date/Time : 2020:05:04 20:28:10+05:30
File Access Date/Time : 2020:05:04 20:28:47+05:30
File Inode Change Date/Time : 2020:05:04 20:28:10+05:30
File Permissions : rw-rw-r--
File Type : JPEG
File Type Extension : jpg
MIME Type : image/jpeg
JFIF Version : 1.02
Resolution Unit : inches
X Resolution : 120
Y Resolution : 120
Image Width : 160
Image Height : 120
Encoding Process : Baseline DCT, Huffman coding
Bits Per Sample : 8
Color Components : 3
Y Cb Cr Sub Sampling : YCbCr4:2:2 (2 1)
Image Size : 160x120
Megapixels : 0.019

[rakshith95]

I'm not sure about the FLIR Lepton. You can check the product specifications if it gives the raw sensor values (some cameras don't). If it does, it's probably some setting you'll have to change, but I don't have much of an idea about this.

[rakshith95]

Hello @Varat7v2 , if your issue is solved, can I close this?

[Varat7v2]

Hi @rakshith95 I could not get temperature yet from FLIR Lepton 3.0. According to its datasheet its output is 14 bit raw data. Keeping all the values constant as mentioned in CThermal.py, how can I get PR1, PR2, PB, PF, and PO for my camera? Have you worked on FLIR Lepton 3.0?

If this camera does not work with Thermal_Image_Analysis, you can close this issue.

Thank you very much for your help.

[rakshith95]

If it outputs the raw values, you should be able to use this package. You might have to change something in the capture settings however, because in the previous comment you posted, the file does not seem to contain the raw sensor values. I have not worked with the FLIR Lepton, but maybe you can post to the FLIR forums/customer support and check

[rakshith95]

@Varat7v2 maybe this thread would be of use to you

[Varat7v2]

Thank you. Sure I will go through that thread.
I have posted in their forum also, but there is no any respond till now.

In CThermal.py, we require lot of parameters that are obtained from exiftool right, in context of mine, I am not getting those parameters as this camera is very basic one which will output only temperature response in terms of some 14bit data (might be like thermistor which respond temperature variation by its resistance difference).

And regarding capture settings, how can I do that? I was using guvcview to capture camera but it does not have any such settings facility.

[rakshith95]

In CThermal.py, we require lot of parameters that are obtained from exiftool right, in context of mine, I am not getting those parameters as this camera is very basic one which will output only temperature response in terms of some 14bit data (might be like thermistor which respond temperature variation by its resistance difference).

If you directly get only the temperature array, I'll have to make some changes to the codes for that compatibility. Maybe I can add that option in a while, but I'll need some data to test it out.

And regarding capture settings, how can I do that? I was using guvcview to capture camera but it does not have any such settings facility.

Sorry, I can't help you here. I don't know about the Lepton

[Varat7v2]

Please let me know if you update your code.

Thank you @rakshith95 .

[rakshith95]

Closing this