Spaces:
Sleeping
Sleeping
File size: 3,968 Bytes
9692d43 |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 |
from typing import Self
from PIL import Image
class Equalize:
MIN_LEVEL = 0.0
MAX_LEVEL = 1.0
R = 0
G = 1
B = 2
@property
def level(self):
return self._level
@property
def level_b(self) -> float:
return self._level[Equalize.B]
@property
def level_g(self) -> float:
return self._level[Equalize.G]
@property
def level_r(self) -> float:
return self._level[Equalize.R]
def __init__(self, level_b: float, level_g: float, level_r: float) -> None:
if level_b < Equalize.MIN_LEVEL or level_b > Equalize.MAX_LEVEL:
raise ValueError('level_b')
if level_g < Equalize.MIN_LEVEL or level_g > Equalize.MAX_LEVEL:
raise ValueError('level_g')
if level_r < Equalize.MIN_LEVEL or level_r > Equalize.MAX_LEVEL:
raise ValueError('level_r')
self._level = [level_b, level_g, level_r]
@staticmethod
def from_level(level: float) -> Self:
return Equalize(level, level, level)
def set_level(self, image: Image) -> Image:
src = image.convert('RGB')
dest = Image.new('RGB', src.size)
width, height = src.size
histogram = [[0 for _ in range(256)], [0 for _ in range(256)], [0 for _ in range(256)]]
src_bytes = src.tobytes()
dest_bytes = bytearray(0 for _ in range(width * 3 * height))
for y in range(height):
for x in range(width):
i = y * width * 3 + x * 3
histogram[Equalize.R][src_bytes[i]] += 1
histogram[Equalize.G][src_bytes[i + 1]] += 1
histogram[Equalize.B][src_bytes[i + 2]] += 1
self._level = self._get_auto_level(histogram)
def filter(self, image: Image) -> Image:
src = image.convert('RGB')
dest = Image.new('RGB', src.size)
width, height = src.size
histogram = [[0 for _ in range(256)], [0 for _ in range(256)], [0 for _ in range(256)]]
src_bytes = src.tobytes()
dest_bytes = bytearray(0 for _ in range(width * 3 * height))
for y in range(height):
for x in range(width):
i = y * width * 3 + x * 3
histogram[Equalize.R][src_bytes[i]] += 1
histogram[Equalize.G][src_bytes[i + 1]] += 1
histogram[Equalize.B][src_bytes[i + 2]] += 1
eqmap = [[0 for _ in range(256)], [0 for _ in range(256)], [0 for _ in range(256)]]
self._create_map(histogram, eqmap)
for y in range(height):
for x in range(width):
i = y * width * 3 + x * 3
dest_bytes[i] = eqmap[Equalize.R][src_bytes[i]]
dest_bytes[i + 1] = eqmap[Equalize.G][src_bytes[i + 1]]
dest_bytes[i + 2] = eqmap[Equalize.B][src_bytes[i + 2]]
dest.frombytes(dest_bytes)
return dest
def _get_auto_level(self, histogram: [[int]]) -> [float, float, float]:
mapbgr = [[0 for _ in range(256)], [0 for _ in range(256)], [0 for _ in range(256)]]
b = 0
g = 0
r = 0
for i in range(256):
b += histogram[Equalize.B][i]
mapbgr[Equalize.B][i] = b
g += histogram[Equalize.G][i]
mapbgr[Equalize.G][i] = g
r += histogram[Equalize.R][i]
mapbgr[Equalize.R][i] = r
threshold = 64
level = [1.0, 1.0, 1.0]
for color in range(3):
map = mapbgr[color]
low = map[0]
high = map[255]
max_diff = 0
for i in range(256):
diff = abs(int((map[i] - low) * 255 / max(high - low, 1)) - i)
if diff > max_diff:
max_diff = diff
if max_diff > threshold:
level[color] = threshold / max_diff
return level
def _create_map(self, histogram: [[int]], eqmap: [[int]]) -> None:
mapbgr = [[0 for _ in range(256)], [0 for _ in range(256)], [0 for _ in range(256)]]
b = 0
g = 0
r = 0
for i in range(256):
b += histogram[Equalize.B][i]
mapbgr[Equalize.B][i] = b
g += histogram[Equalize.G][i]
mapbgr[Equalize.G][i] = g
r += histogram[Equalize.R][i]
mapbgr[Equalize.R][i] = r
for color in range(3):
map = mapbgr[color]
low = map[0]
high = map[255]
level = self.level[color]
for i in range(256):
c = i
if level > Equalize.MIN_LEVEL:
value = int((map[i] - low) * 255 / max(high - low, 1))
if level == Equalize.MAX_LEVEL:
c = value
else:
c = i + int((value - i) * level)
eqmap[color][i] = c
|