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Using a compatible usb webcam or pi cam. Which of these two is better in the way of controlling the capture settings like iso, exposure time, etc ? And which of these will be more energy efficient and easier to integrate with pi.

Vignesh Narendran
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The Raspi camera connects directly to the GPU, and is capable of 1080p30 video encode, 5MP stills in pretty decent quality. Because its attached to the GPU, there is only a little impact on the CPU, leaving it available for other processing.

Webcams (unless they have built in encoding - expensive) are unlikely to get the same performance, and they also use a LOT more CPU.

The difference between the Pi Camera and USB webcam is performance and higher frame rate with h.264 video encoding. With a USB webcam you have low frame rate and no GPU encoding but that doesn't really matter if all you want to do is take photos.

Luiz Correia
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