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one_channel_filter (hdi,hdo,U0, V0,
theta, Sigma1, Sigma2,
SigmaLP, alpha, filter,
nonlin, blurr, twoangle)
struct header *hdi, *hdo;
double U0, V0, theta, Sigma1,
Sigma2, SigmaLP, alpha;
int filter, nonlin, blurr;
Boolean twoangle;
- Input image
- Output image
- Vert. centre frequency
- Horz. centre frequency
- Rotation of filter
- Vert. sigma for filter
- Horz. sigma for filter
- Sigma for low-pass `feature' filter
- Alpha in tanh(..) nonlinearity
- Filter type identifier
(NO_FILTER, GENERAL_GABOR or EVEN_GABOR)
- Nonlinearity identifier
(NO_NONLIN or TANH_NONLIN)
- Blurring identifier (blurring=lowpass filtering)
(NO_BLURR or BLURR)
- Use both positive and negative angle?
If true, then the frequeny responses of both the Gabor
filter with +theta angle and theta+90 degrees angles will be
added to form one frequency response of the filter.
Remember that filtering is performed by multiplication
in the Fourier domain.