OpenCV Invalid background description file

Question

When I try using this Command: opencv_createsamples -img image.jpg -bg bg.txt -info /info/info.lst -pngoutput info -num 2600 it tells me: Invalid background descrip

Answer 1

I had the same problem and tried many different things (adding full path names in the bg.txt, convert to UTF-8,...) - which resulted in getting slightly different looking errors - but still, no success. I am following this tutorial - and I am preparing all the files on my windows laptop & then pushing them to a ubuntu server.

Then I read it might be caused by difference in line ending (CLRF and LF) and checked my file (on the ubuntu server):

$ file bg.txt  
bg.txt: UTF-8 Unicode (with BOM) text, with CRLF line terminators

I converted the file from dos2unix:

$ sudo apt install dos2unix
$ dos2unix bg.txt
dos2unix: converting file bg.txt to Unix format ...
$ file bg.txt
bg.txt: ASCII text

And now the opencv_createsamples command worked.