> For the complete documentation index, see [llms.txt](https://vikram-bajaj.gitbook.io/deep-learning-specialization-coursera/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://vikram-bajaj.gitbook.io/deep-learning-specialization-coursera/convolutional-neural-networks/object-detection/landmark-detection.md).

# Landmark Detection

Landmarks are points of interest in an image.

For example, the outline of a person's mouth can have several landmarks, which can be used to determine if he/she is smiling/frowning/neutral.

If training images contain landmarks, a CNN will be able to output landmarks on test images.

Landmark detection is used by several apps like Snapchat.

Common use cases include emotion recognition, pose detection etc.