How does s16 convert to u32 in convert-bit-depth

OpenVX
1

I wonder how does a s16 value convert into a u32 value.
what if the source value is negative?

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2

Does it just become 0 if it is negative?

3

can any body help? :<

4

does not support…
the specification says only support s16 to u8 or u8 to s16