DragonHD
29 lines
669 B
Python
29 lines
669 B
Python
from PIL import Image
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import sys
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p = sys.argv[1]
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img = Image.open(p).convert("L")
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W, H = img.size
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px = img.load()
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# edge density per row: count |v(x)-v(x-2)| > 40
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rows = []
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for y in range(H):
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c = 0
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for x in range(2, W):
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if abs(px[x, y] - px[x-2, y]) > 45:
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c += 1
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rows.append(c)
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# report top rows grouped
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thr = max(20, sorted(rows)[int(H*0.97)])
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print("W,H", W, H, "row-edge threshold", thr)
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bands = []
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y = 0
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while y < H:
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if rows[y] > thr:
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y0 = y
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while y < H and rows[y] > thr:
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y += 1
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bands.append((y0, y, max(rows[y0:y])))
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y += 1
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for b in bands[:40]:
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print("band y=%d..%d maxedge=%d" % b)
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