Annotation formats
Similar to labeling tools, many different annotation formats are available for annotating images for computer vision applications. The common standards include COCO JSON, Pascal VOC XML, and YOLO PyTorch TXT. There are many more formats (e.g., TensorFlow TFRecord, CreateML JSON, and so on). However, this section covers only the previously listed three most common annotation standards due to space limitations. Furthermore, this section uses two images and labels extracted from the test set of the brain tumor object detection dataset available from Kaggle (https://www.kaggle.com/datasets/davidbroberts/brain-tumor-object-detection-datasets) to illustrate these data formats and demonstrate their differences, as shown in Figure 3.4. This section briefly discusses the key points of each annotation format, and interested readers can refer to the GitHub page of this chapter to inspect this same dataset in different formats in further detail.
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