I've been implementing this paper and was asking myself how the following formula could reconstruct the edges given a Haar Wavelet transformed image :

$$ \sqrt{LH_i^2 + HL_i^2 + HH_i^2} $$

This formula is on page 2, Algorithm 1, step 2.

I looked at the reference given, but couldn't find where this was explained.

Thanks in advance for any help.

I have been implementing the paper Blur Detection for Digital Images Using Wavelet Transform and was asking myself how the following formula could reconstruct the edges given a Haar Wavelet transformed image :

$$ \sqrt{LH_i^2 + HL_i^2 + HH_i^2} $$

This formula is on page 2, Algorithm 1, step 2.

I looked at the reference given, but couldn't find where this was explained.

I've been implementing this paper and was asking myself how the following formula could reconstruct the edges given a Haar Wavelet transformed image :

$$ \sqrt(LH_i^2 + HL_i^2 + HH_i^2) $$

This formula is on page 2, Algorithm 1, step 2.

I looked at the reference given, but couldn't find where this was explained.

Thanks in advance for any help.

I've been implementing this paper and was asking myself how the following formula could reconstruct the edges given a Haar Wavelet transformed image :

$$ \sqrt{LH_i^2 + HL_i^2 + HH_i^2} $$

This formula is on page 2, Algorithm 1, step 2.

I looked at the reference given, but couldn't find where this was explained.

Thanks in advance for any help.