of the autofocus function curve. That is, the middle value is larger than
either of the endpoints.
3. Use these three points to compute the Gaussian approximation to predict
the coarse-scale in-focus position, m, using Eq. 16.5, and capture an
image there.
4. Compute the autofocus function, f, using Eq. 16.11, but this time use the
wavelet coefficients at a fine scale (high resolution) of the image captured
in step 3.
5. Apply the Fibonacci algorithm at high resolution to locate three new
reference z-axis positions, where f
1
, f
2
, and f
3
are now closer together but
still cover the in-focus peak of the autofocus function curve.
6. Use these three points to compute the parabola approximation to find the
fine-scale in-focus position, y, using Eq. 16.9.
Figures ...