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Collect Data
You have to collect image data set to train your model, you have to be careful to collect variety of images other than same type of images to increase the quality of our training. From the total no of images you have to get 10% to 20% for validation purposes, to check the accuracy of our trained model.
Label / Annotate Images
You can use LabelImg tool to annotate the images, you can get a better idea from below link,
https://github.com/tzutalin/labelImg
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Java Source Point 