How to detect what is there, in an image?

Solar2D Advanced Graphics
#1

Hello…

I will try to explain.

Let,s say I take a picture with the camera – [media.capturePhoto]

the image is a white rectangle 200X200 pixels

in the center of the image I have a black square 20X20 pixels

That’s it a white page with a black square in the center.

QUESTION

is there a way that I can program some code to tell the app

function isSquare( )

    “see” the image and if you see a black square then

               audio.play(aSound)

      if it is a black circle

               image.rotation = 45

      end

end

Something like that.

The idea is to be able to “see” with a program what is inside that image

I hope this make sense and you can help me out.

Thanks

Victor

#2

As far as I know, you can’t read or manipulate image pixels directly with Corona – think that requires using Corona Enterprise and doing it as native code for the OS you’re targeting (or simply build your whole app native).

#3

So the only way to do it is with Xcode? my app is for the iPad

#4

Actually we do.  See:  https://docs.coronalabs.com/api/library/display/colorSample.html

This is a costly call.  Do not run it in a tight loop. You have to setup a call back function, it does not return the value immediately. 

Rob

#5

As far as I know, you can’t read or manipulate image pixels directly with Corona – think that requires using Corona Enterprise and doing it as native code for the OS you’re targeting (or simply build your whole app native).

#6

So the only way to do it is with Xcode? my app is for the iPad

#7

Actually we do.  See:  https://docs.coronalabs.com/api/library/display/colorSample.html

This is a costly call.  Do not run it in a tight loop. You have to setup a call back function, it does not return the value immediately. 

Rob