Upload json2mask.py with huggingface_hub
Browse files- json2mask.py +95 -0
json2mask.py
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"""
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LabelMe line 标注 → 二值掩码 PNG
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---------------------------------
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输入:172 个 JSON 文件(shape_type="line")
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输出:同名的 _mask.png(白色=弦,黑色=背景)
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用法:
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python json2mask.py \
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--json_dir /home/wz/Git/SAM_guqin/annotations \
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--img_dir /home/wz/Git/SAM_guqin \
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--out_dir /home/wz/Git/SAM_guqin/masks \
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--line_width 7
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"""
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import json
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import cv2
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import numpy as np
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import argparse
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import os
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from pathlib import Path
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def json_to_mask(json_path, img_h, img_w, line_width=7):
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"""把一个 LabelMe JSON 里所有 line 形状画成二值掩码"""
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with open(json_path, "r") as f:
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data = json.load(f)
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mask = np.zeros((img_h, img_w), dtype=np.uint8)
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for shape in data["shapes"]:
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if shape["shape_type"] != "line":
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continue
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pts = shape["points"]
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x1, y1 = int(round(pts[0][0])), int(round(pts[0][1]))
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x2, y2 = int(round(pts[1][0])), int(round(pts[1][1]))
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# 画线,thickness 对应弦宽(像素)
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cv2.line(mask, (x1, y1), (x2, y2), 255, thickness=line_width)
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# 轻微膨胀,弥补标注偏差
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kernel = cv2.getStructuringElement(cv2.MORPH_ELLIPSE, (3, 3))
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mask = cv2.dilate(mask, kernel, iterations=1)
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return mask
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def main():
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parser = argparse.ArgumentParser()
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parser.add_argument("--json_dir", required=True, help="JSON 文件目录")
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parser.add_argument("--img_dir", required=True, help="原始图像目录")
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parser.add_argument("--out_dir", required=True, help="掩码输出目录")
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parser.add_argument("--line_width", type=int, default=7,
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help="弦线宽度(像素),默认 7")
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args = parser.parse_args()
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os.makedirs(args.out_dir, exist_ok=True)
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json_files = sorted(Path(args.json_dir).glob("*.json"))
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if not json_files:
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raise FileNotFoundError(f"在 {args.json_dir} 下没有找到 JSON 文件")
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print(f"共找到 {len(json_files)} 个 JSON 文件,开始转换...")
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ok, skip = 0, 0
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for jf in json_files:
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# 读取图像尺寸(优先从 JSON 里取,避免再读图)
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with open(jf) as f:
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meta = json.load(f)
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img_h = meta.get("imageHeight")
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img_w = meta.get("imageWidth")
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# JSON 里没有尺寸则从图像文件读
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if not img_h or not img_w:
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img_name = meta.get("imagePath", jf.stem + ".jpg")
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img_path = Path(args.img_dir) / img_name
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if not img_path.exists():
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print(f" [SKIP] 找不到图像: {img_path}")
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skip += 1
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continue
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img = cv2.imread(str(img_path))
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img_h, img_w = img.shape[:2]
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mask = json_to_mask(jf, img_h, img_w, args.line_width)
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out_name = jf.stem + "_mask.png"
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out_path = Path(args.out_dir) / out_name
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cv2.imwrite(str(out_path), mask)
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ok += 1
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print(f" [{ok}/{len(json_files)}] {jf.name} → {out_name}")
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print(f"\n完成!成功 {ok} 张,跳过 {skip} 张")
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print(f"掩码保存在: {args.out_dir}")
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if __name__ == "__main__":
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main()
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