After creating our description file of positive and negative samples, the next step towards building our classifiers includes packing the positive samples into a vec file.
Building a vector file is done via the opencv_createsamples utility. Opencv_createsamples allows us to generate a large number of samples from a small number of input images by applying distortions and transformations to positive samples.
We wrote shell scripts to automate using a few of the opencv command line tools. The shell script for createsamples is below.
Part of our vec file generated
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