opencv-createsamples1

Usage

Overview

opencv-createsamples creates positive samples from a single object image or a collection of positive images.

The scheme of test samples creation is similar to training samples creation since each test sample is a background image into which a randomly distorted and randomly scaled instance of the object picture is pasted at a random position.

Options

opencv-createsamples supports the following options:

-info collection_file_name

A database of positive source images. Use it together with -img to create test samples instead.

-img image_file_name

A positive source image. Use it together with -info to create test samples instead.

-vec vec_file_name

The output file name containing the generated positive samples for training.

-bg background_file_name

The background description file (the negative sample set). It contains a list of images into which randomly distorted versions of the object are pasted for positive sample generation.

-num number_of_samples

The number of positive samples to generate/train. The default is 1000.

-bgcolor background_color

The background color (currently grayscale images are assumed); the background color denotes the transparent color. The default is 0.

-bgthresh background_color_threshold

The amount of color tolerance The background color threshold. Pixels whose colors are in range ± background_color_threshold are considered as transparent.

-inv

Invert the colors.

-randinv

Invert the colors randomly.

-maxidev max_intensity_deviation

The desired maximum intensity deviation of foreground samples pixels. The default is 40.

-maxxangle max_x_rotation_angle

The maximum rotation angle in x-direction in radians. The default is 1.1.

-maxyangle max_y_rotation_angle

The maximum rotation angle in y-direction in radians. The default is 1.1.

-maxzangle max_z_rotation_angle

The maximum rotation angle in z-direction in radians. The default is 0.5.

-show [scale_factor]

Show each created sample during the creation process. Optionally a scaling factor can be defined. The default is 4.0.

If <ESC> is pressed, the creation process will continue without showing the samples. This can be useful for debugging purposes.

-h sample_height

For the creation of training samples, it is the resulting sample height. The default is 24.

In case of creating test samples, it is the minimal height of placed object picture.

-w sample_width

For the creation of training samples, it is the resulting sample width. The default is 24.

In case of creating test samples, it is the minimal width of placed object picture.

The same information is shown, if opencv-createsamples is called without any arguments/options.

Examples

To create training samples from one image applying distortions and show the results:

opencv-createsamples -img source.png -num 10 -bg negatives.dat -vec samples_out.vec -show

To create training samples of size 40x40 from some images without applying distortions:

opencv-creasamples -info source.dat -vec samples_out.vec -w 40 -h 40