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I find that the scale factor in BinaryDescriptor::detect() is fixed to sqrt(2), which does not depend on the input parameter reductionRatio. But in BinaryDescriptor::compute(), the scale factor becomes not fixed, which equals to BinaryDescriptor. My question is why they are different?

I find that the scale factor in BinaryDescriptor::detect() is fixed to sqrt(2), which does not depend on the input parameter reductionRatio. But in BinaryDescriptor::compute(), the scale factor becomes not fixed, which equals to BinaryDescriptorreductionRatio. My question is why they are different?