Android punch card systems, camera duration is too long, how to solve ()

            
Every punch is at work while taking pictures, but the time is too long (5 seconds to complete a), how to shorten, if not, what way?
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The pictures of the machine for a change
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Improve hardware performance machine
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There is a lower picture resolution. 640 * 480 is enough

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With threads. . .
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I also think that customers need to change a punch card machine! Either the preview pictures when I try!