在用不上浮点数时，数值又大于65535的时候，为了提高避免浮点运算性能损失，需要用到uint32或者int32，当然也可以用CV_32S，但为什么不顺便提供一个CV_32U呢？
一个并没有解答的FQA
CV_8U – 8-bit unsigned integers ( 0…255 )
CV_8S – 8-bit signed integers ( -128…127 )
CV_16U – 16-bit unsigned integers ( 0…65535 )
CV_16S – 16-bit signed integers ( -32768…32767 )
CV_32S – 32-bit signed integers ( -2147483648…2147483647 )
CV_32F – 32-bit floating-point numbers ( -FLT_MAX…FLT_MAX, INF, NAN )
CV_64F – 64-bit floating-point numbers ( -DBL_MAX…DBL_MAX, INF, NAN )
悬而未决
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