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How does the Web SDK "single image mode" work?

This mode is meant as an alternative/fallback mode for a `BarcodePicker` to provide single camera pictures to be scanned. It still performs all operations locally in the browser, but trades off continuous camera video stream access for (more high quality) single snapshot scanning; this results in less browser features needed for the library to work and extended browser support. In "single image mode" a specially set UI is provided which enables users to click/tap to directly take a picture with the camera (mobile) or upload a file (desktop), this picture is then scanned and the results are provided. In this mode camera access permissions don't have to be requested.

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