What is a Reverse Image Search?
Reverse image search is a search engine technology that takes an image file as input query and returns results related to the image. Search engines that offer reverse image capability include Google and TinEye. Some websites, such as Reddit, also provide a reverse image search capacity.
Google Reverse Image Search
Google being one of the most popular search engines in the world has the ability, to use an image to search for results, as opposed to text-based search terms. With this capability, the results of the images can be cross compared to see associated assets.
For example, if we have a picture of a building, like the below:
We have be able to highlight similar buildings, who has might have posted on social media about being at the building, and ultimately gaining intelligence on the area.