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Add gabor filter #5289

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Merged
poyea merged 8 commits into from
Nov 2, 2021
Merged

Add gabor filter #5289

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fa90cf4
add gabor_filter.py
Mozartuss Oct 14, 2021
ec3eed4
Update gabor_filter.py
Mozartuss Oct 14, 2021
82ab594
update gabor_filter.py
Mozartuss Oct 14, 2021
b198cd5
add doctest
Mozartuss Oct 15, 2021
97bf960
change import order
Mozartuss Oct 15, 2021
08d703e
Update digital_image_processing/filters/gabor_filter.py
Mozartuss Oct 19, 2021
ed0f359
Update gabor_filter.py
poyea Oct 27, 2021
97dd0d4
fix gabor filter calculation
Mozartuss Nov 1, 2021
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fix gabor filter calculation
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@Mozartuss
Mozartuss committed Nov 1, 2021
commit 97dd0d45062c19593518eea99a158f788632a81f
12 changes: 10 additions & 2 deletions digital_image_processing/filters/gabor_filter.py
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Expand Up @@ -24,6 +24,9 @@ def gabor_filter_kernel(
"""

# prepare kernel
# the kernel size have to be odd
if (ksize % 2) == 0:
ksize = ksize + 1
gabor = np.zeros((ksize, ksize), dtype=np.float32)

# each value
Expand All @@ -33,11 +36,16 @@ def gabor_filter_kernel(
px = x - ksize // 2
py = y - ksize // 2

# degree to radiant
_theta = theta / 180 * np.pi
cos_theta = np.cos(_theta)
sin_theta = np.sin(_theta)

# get kernel x
_x = np.cos(theta) * px + np.sin(theta) * py
_x = cos_theta * px + sin_theta * py

# get kernel y
_y = -np.sin(theta) * px + np.cos(theta) * py
_y = -sin_theta * px + cos_theta * py

# fill kernel
gabor[y, x] = np.exp(
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