77 lines
1.9 KiB
Python
77 lines
1.9 KiB
Python
# High Quality Edge Thinning using Pure Python
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# Written by Lvmin Zhang
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# 2023 April
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# Stanford University
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# If you use this, please Cite "High Quality Edge Thinning using Pure Python", Lvmin Zhang, In Mikubill/sd-webui-controlnet.
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import cv2
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import numpy as np
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lvmin_kernels_raw = [
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np.array([
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[-1, -1, -1],
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[0, 1, 0],
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[1, 1, 1]
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], dtype=np.int32),
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np.array([
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[0, -1, -1],
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[1, 1, -1],
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[0, 1, 0]
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], dtype=np.int32)
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]
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lvmin_kernels = []
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lvmin_kernels += [np.rot90(x, k=0, axes=(0, 1)) for x in lvmin_kernels_raw]
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lvmin_kernels += [np.rot90(x, k=1, axes=(0, 1)) for x in lvmin_kernels_raw]
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lvmin_kernels += [np.rot90(x, k=2, axes=(0, 1)) for x in lvmin_kernels_raw]
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lvmin_kernels += [np.rot90(x, k=3, axes=(0, 1)) for x in lvmin_kernels_raw]
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lvmin_prunings_raw = [
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np.array([
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[-1, -1, -1],
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[-1, 1, -1],
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[0, 0, -1]
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], dtype=np.int32),
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np.array([
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[-1, -1, -1],
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[-1, 1, -1],
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[-1, 0, 0]
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], dtype=np.int32)
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]
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lvmin_prunings = []
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lvmin_prunings += [np.rot90(x, k=0, axes=(0, 1)) for x in lvmin_prunings_raw]
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lvmin_prunings += [np.rot90(x, k=1, axes=(0, 1)) for x in lvmin_prunings_raw]
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lvmin_prunings += [np.rot90(x, k=2, axes=(0, 1)) for x in lvmin_prunings_raw]
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lvmin_prunings += [np.rot90(x, k=3, axes=(0, 1)) for x in lvmin_prunings_raw]
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def remove_pattern(x, kernel):
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objects = cv2.morphologyEx(x, cv2.MORPH_HITMISS, kernel)
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objects = np.where(objects > 127)
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x[objects] = 0
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return x, objects[0].shape[0] > 0
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def thin_one_time(x, kernels):
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y = x
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is_done = True
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for k in kernels:
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y, has_update = remove_pattern(y, k)
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if has_update:
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is_done = False
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return y, is_done
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def lvmin_thin(x):
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y = x
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for i in range(32):
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y, is_done = thin_one_time(y, lvmin_kernels)
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if is_done:
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break
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y, _ = thin_one_time(y, lvmin_prunings)
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return y
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