scanning barcode by android mobile

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Pushkar1

Joined Apr 5, 2021
416
I see that in retail stores they use scanner to scan barcode. I also see that any barcode can be scanned by android mobile for which we need to install scanner app in mobile. I have scanned the bar code by my mobile using the app. I found that mobile camera is used as scanner to scan barcode.

A camera's job is to take images only, it doesn't scan barcodes. I don't understand how mobile phone decode barcode with the app using camera? Is there any other circuit used in the mobile for scanning like scanner?
 
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