Documentation for opencv_annotation

edit

hi. I wrote the following code:

#include "cmd_utils.h"
#include <iostream>

#define PICS_PATH "/home/biagio/Documenti/wise_robotics/annotations/build/data/image_folder/"
//#define PICS_PATH "/data/pics/"
#define ANNOTATIONS_PATH "/home/biagio/Documenti/wise_robotics/annotations/build/data/annotations.txt"
//#define ANNOTATIONS_PATH "/data/annotations.txt"
#define ANNOTATIONS_CMD "opencv_annotation -images " PICS_PATH " -annotations " ANNOTATIONS_PATH

using namespace std;

int main()
{
    //remove(ANNOTATIONS_PATH);

    execute_command(ANNOTATIONS_CMD);
}

I used the same structure for /data, a local folder. absolute paths seem correct but I get

The image folder given does not exist.

why so?

folder exists, of course and has right name

Probably because you are using the most recent version of OpenCV, where the official command line parser has been integrated. There we would ask you to provide the data as follows: opencv_annotation --images=/data/image_folder/ --annotations=/data/annotations.txt

thanks a lot, it worked. I see you've added a revision to your original post, I'm glad of having been useful with my question :))))) thanks again.

one more question: if I stop the process, by pressing ESC, after labelling N images and restart it, does it begin again from first image or does it continue from image N+1?

Euhm it will start just over, because it would be another complexity to remember in a file where it last passed. It does store the detections when pressing ESC, so you could just make a cropped folder and continue on that one.

yes, that's what I was thinking. a nice improvement would be to resize each rectangle after drawing it on image, before pressing C to confirm it. in fact, it's not easy to crop image with rectangle at first attempt. using dragable corners to size properly area of interest, would make things easier. do you think it may possible?

thanks for your patience and support.

Thats not possible using the available OpenCV interfaces, since the library is not meant to do heavy user interfacing. For that one would need extra functionality.

I am have python-opencv installed and opencv_samples works fine but when i do opencv_annotation command it says command not found. please help

I do not think that this functionality is available from python, especially since the tools are not wrapped into python. It is not a sample, for which specific python samples exist, rather a tool that we provide which heavily depends on the C++ functionality to build your models seperately which can then be used to detect stuff, even in python.