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IPhone light sensor against camera for measuring light intensity

I need to create an application that measures light intensity, as shown below:

http://itunes.apple.com/us/app/luxmeter-pro/id408369821?mt=8 http://itunes.apple.com/us/app/megaman-luxmeter/id455660266?mt=8

and I wonder which one is the best to solve. As I understand it, it is not possible to use the light sensor APIs that are private to Apple. What classes can I use to capture frames and get properties like pixel color or some kind of output that I can convert to Lux later?

Thanks!

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What you really want is to take an image using the camera api and run an algorithm to determine the brightness. You can do this on the fly. See below:

Camera Tutorial: http://developer.apple.com/library/ios/#DOCUMENTATION/AudioVideo/Conceptual/CameraAndPhotoLib_TopicsForIOS/Articles/TakingPicturesAndMovies.html

Brightness Algorithm: http://b2cloud.com.au/tutorial/obtaining-luminosity-from-an-ios-camera

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Source: https://habr.com/ru/post/912475/

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