Find a small image pattern in another similar image

1. How do I search the same picture with different sizes?
2. How do you compare the similarity of two images?
3. Is there an app to find similar photos?

How do I search the same picture with different sizes?

Here's how. Go to images.google.com and enter the search terms as before. Then append imagesize:WIDTHxHEIGHT to your query and hit Enter.

How do you compare the similarity of two images?

The similarity of the two images is detected using the package “imagehash”. If two images are identical or almost identical, the imagehash difference will be 0. Two images are more similar if the imagehash difference is closer to 0.

Is there an app to find similar photos?

On Android, Google Lens is available as a standalone app. iOS users can access Lens within the Google search app (by tapping the camera icon in the search bar) or the Google Photos app. In Google Photos, open an image you've taken and tap the Lens icon (second from the right, next to the trash icon).