Data Annotation Services

Infosearch BPO
4 min readOct 19, 2023


In machine learning and artificial intelligence, annotation services often relate to an act of attaching some kind of metadata or labs to data. Metadata or labelling is supplementary information that is attached to data to facilitate training of better machine learning models. In many areas like natural language processing, computer vision and data analysis they use annotation services while creating labeled datasets for supervised learning.

Quality labelled datasets require annotation service to training and validating of Machine Learning models. The process involves delegation of such functions to experienced service providers who have human annotators that use guidelines to identify accurate labels in the data. Such labeled datasets allow training and enhancing machine learning algorithms developed in various fields such as recommendation systems and self-driving cars.

Infosearch BPO is a data annotation company with more than 18 years of experience, which offers machine-learning and AI companies with data annotation and labeling services to prepare and enrich datasets for their projects. Quality labeled data services are important since they form the basis of training, testing, and enhancing machine learning systems.

Annotation types and techniques offered at Infosearch

Here are some common types of annotation services:

1. Image Annotation: Objects in this case refer to objects or other points of interest in the image. Image classification, object detection, and facial recognition are instances of such tasks. We offer the following techniques under image annotation.

a. Bounding box Annotation

b. Polygon Annotation

c. 3D Cuboid Annotation

d. Keypoint Annotation

e. Landmark Annotation

2. Text Annotation: Labeling of textual data is done in this which refers to sentiment analysis, named entity recognition, text classification and part-of-speech tagging.

3. Video Annotation: Like image annotation, this is about labeling objects and actions in videos-for purposes of video surveillance and action recognition.

4. Audio Annotation: Classification of audio data for speech recognition, its classification, and speaker detection.

5. Geospatial Annotation: This is the reason why they are applied for annotating geographic data such as mapping information, roads on the Internet, and satellite images.

6. Semantic Segmentation: It is a type of image labeling, which involves classifying every pixel or element of an image into its respective class or label.

7. 3D Point Cloud Annotation or 3D Lidar Annotation

8. Autonomous Vehicle Annotation

Data Annotation, Labeling, and Tagging Services

Annotation, labeling, and tagging are processes that provide additional data to raw data by adding metadata or special information to make it more organized, readable, and applicable for numerous purposes such as machine learning and data analysis. While these terms are sometimes used interchangeably, they can have distinct nuances:

1. Data Annotation:

o The encompassing method of attaching annotations, labels or tags onto any form of data under the title of data annotation goes beyond the borders of data’s formality. And it may be understood in terms of filling data with supplementary material so that it gets more informative.

o Data Annotation applies to several data formats such as text, images, audio, video, time series and so on. Annotating a dataset of medical images might include identifying ROIs or abnormalities.

2. Data Labeling:

o Labeling is a special form of data annotations that generally involves categorization and classification to different groups or categories. The most common application of this strategy is supervised machine learning.

o The term labelling for example refers to when assigning each image into one of pre-defined categories like “cat” or “dog” for purposes of image classification task.

3. Data Tagging:

o Tagging involves the assignment of descriptive words/tags to data for easier search, organizing, and retrieval. This can be observed in CMSs and social media platforms.

o Tagging may include attaching keywords to a text document in order to enable users locate and group it conveniently.

Manual labelling and data annotation for AI, machine learning

Data annotation and labeling services typically involve the following:

1. Data Preparation: The second step involves collecting, cleansing and organizing the raw data from different places so as to make them available for annotation.

2. Annotation and Labeling: These services are centered on annotators labeling/ tagging/annotating information into the dataset as per their desired type of project. These can be object detection, sentiment analysis, text classifications among others.

3. Quality Control: The accuracy and the consistency of annotations are important. Validation and other quality control measures are in place to assure the reliability of the labeled records or other datasets.

4. Data Formatting: Such as making data correspond to deep learning forms, a structured dataset should be formatted according to the needs of machine learning models.

5. Customization: They may tailor data annotation services according to a particular machine learning project; for instance, this may be specified as regarding a certain industry like medical imagery or autopilot, natural language processing.

6. Security and Confidentiality: One of them is that it protects sensitive data. Legitimate data annotation service companies observe strict confidentiality protocols, guaranteeing integrity during data processing.

7. Scalability: Scalability of services to adapt to all size of datasets, providing flexibility for projects requirement.

Contact Infosearch for all your annotation support services:


Email: enquiries(AT)infosearchbpo(DOT)