Hello.
I'm trying to create positive samples with the opencv_createsamples tool but i'm having some problems:
I want to detect this images 
As I found, I can create positive samples using the createsamples tool with other background images.
_Folder structure:_
Parent folder (wehere I'm running the instruction)
│
─── haar
│ └─── neg
│ │ bg.txt (with path of the bg images)
│ └─── train
│ └─── pos
│ └─── images
│
└─── images (images to detect)
│ image1.jpg
Instruction i'm running:
opencv_createsamples -img images/image1.jpg -bg haar/neg/bg.txt -info haar/pos/info.dat -bgthresh 0 -maxxangle 0.3 -maxyangle 0.3 -maxzangle 0.3 -num 50 -w 150 -h 15
The problems are:
1 - Sometimes i get an error during the execution:
OpenCV Error: Incorrect size of input array () in cvGetSubRect, file /home/jorge/dev/fingerP/opencv-3.2.0/modules/core/src/array.cpp, line 1275
terminate called after throwing an instance of 'cv::Exception'
what(): /home/jorge/dev/fingerP/opencv-3.2.0/modules/core/src/array.cpp:1275: error: (-201) in function cvGetSubRect
2 - in other ocasions the execution finishes but neither images nor data into the _info.dat_ file has been created
3- When images are created (in the case 1 of these problems) the image looks like this:
with the positive image on it but cropped.
Can anyone help me?
Thanks!