Types of data annotation
Data annotation is a broad practice that encompasses different types of data, including image, text, audio and video. Each type of data has its own unique challenges when it comes to annotation.
Image annotation involves creating bounding boxes (for object detection) and segmentation masks (for semantic and instance segmentation) to differentiate the objects of different classes. Image annotation is often used to create training machine learning datasets for the learning algorithms
Text annotation is the addition of relevant information about the language data by adding labels or metadata. For example, you might add labels such as “title,” “description,” and “copyright” to text files. Text annotation can also involve sentiment annotation, which assigns labels that represent human emotions such as sad, happy, angry, positive, negative, neutral, etc. Finally, semantic annotation can add metadata, additional information, or tags to text that involves concepts and entities, such as people, places, or topics.
NLP for Developers: Annotating Language Data – A Video by Rasa
Audio annotation is the process of recording and transcribing speech, with a focus on phonetics, accents, and speaker demographics. Every use case is different; some require a very specific approach such as tagging aggressive speech indicators for emergency hotline technology applications. The term “data annotation” can refer to anything from annotating the content of an audio file to annotating a single word. Several factors affect how efficient a system is for processing information, and data annotation helps with this process by identifying them all. Non-verbal cues such as silence or background noise are also annotated in order to make algorithms more efficient.
Video annotation is the task of labeling sections or clips to be used to identify, classify, or detect the desired objects in a virtual environment. This is done using the same techniques as image annotation like bounding boxes or semantic segmentation, but on a frame-by-frame basis. Annotation is an essential technique for computer vision tasks such as localization and object tracking. By annotating videos, we can provide valuable information that can be used to improve these tasks.
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