an app using the camera which records the hand gestures of the deaf person and than translates it into a text on your screen
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This isn't a bad idea at all - I'm sure it'd help a lot of people out there.
The main problem is how do you plan to do it? You'd need to build an app (that's easy) which's going to use some kind of a neural network in order to understand what the person's trying to say to you.
+ A great idea which would help a lot of people
- You'd need a big research team in order to start the project