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gtatters / Thermimage

R Package for working with radiometric thermal image files and data

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Error when loading FLIR jpg

lossberger opened this issue · comments

commented

When importing an FLIR jpg according to the instructions from https://github.com/gtatters/Thermimage (OS: Win 10) using the following code the error message beyond is shown and import is stopped.

Code:
_install.packages("Thermimage")
library(Thermimage)
image <- paste0(system.file("..........thermo.jpg", package="Thermimage"))
cams<-flirsettings(".............thermo.jpg", "........./exiftool-12.03/", camvals="")
cams
img<-readflirJPG("............thermo.jpg", "........../exiftool-12.03/")

Error message in console:

img<-readflirJPG("........../thermo.jpg", ".............../exiftool-12.03/")
Error in if (cams$Info$RawThermalImageType == "TIFF") { :
argument is of length zero

So far I havent been able to determine where the problem is situated, therefore I am looking forward for answers or suggestions.

Thanks a lot in advance.

commented

these errors are sometimes pathing errors (ie. exiftool is not properly installed). I would first suggest you verify exiftool is installed first, and don't specify the location to see if it can pick it up in the normal location (C:/windows/System32). I only included the customised path example to allow users to attempt to troubleshoot, but I advise you install exiftool in an appropriate folder in windows that is in the PATH environment (c:/windows).

Sometimes people suggest they are loading a flir jpg, but it is not a radiometric image, which might be the problem. Have you tried the example in the flirsettings function to verify this?

Example using the flirsettings function:

library(Thermimage)
## Sample flir jpg included with Thermimage package:

imagefile<-paste0(system.file("extdata/IR_2412.jpg", package="Thermimage"))

## Extract meta-tags from thermal image file ##
cams<-flirsettings(imagefile, exiftool="installed", camvals="")

If you have spaces in file or folder names, it might be a problem. I would also suggest looking at other closed issues for help, as similar issues have come up.

The error message you are getting, assuming R can find the file and path, suggests that the jpg is not a radiometric jpg, but without a sample file I cannot be sure.

commented

Hi,

Thanks for the answer and the guidlines provided.

Indeed it was a combination of a pathing problem as well as a problem regarding the FLIR jpg.

Thanks a lot.