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Export MCAP camera frames to PNG with robot coordinate axis overlays

Project description

mcap2shadowimg

将 MCAP 文件中的相机视频帧导出为 PNG,并可在图像上叠加机器人坐标轴。


安装

pip install mcap2shadowimg

环境要求:Python 3.10 ~ 3.12,macOS / Linux / Windows。


快速开始

单个 MCAP 文件:

mcap2shadowimg --input /path/to/bag.mcap --output ./output

批量处理(目录下多个 .mcap):

mcap2shadowimg --input /path/to/mcap_dir --output ./output

每个 MCAP 会在输出目录下按文件名创建子目录,例如:

output/
  my_bag/
    camera2/
      1778813410223851000.png
      ...

常用参数

参数 默认值 说明
--input 必填 .mcap 文件路径,或包含多个 .mcap 的目录
--output ./output PNG 输出目录
--cameras 2 要导出的相机编号,逗号分隔
--overlay-robots robot1,robot2 绘制坐标轴的机器人 id
-v, --verbose 关闭 输出详细日志

示例:

# 导出 camera0 和 camera2
mcap2shadowimg --input bag.mcap --output ./output --cameras 0,2

# 指定叠加的机器人
mcap2shadowimg --input bag.mcap --output ./output --overlay-robots robot1,robot2

# 开启详细日志
mcap2shadowimg --input bag.mcap --output ./output -v

输出说明

  • 默认只导出 camera2
  • PNG 文件名为 MCAP 的 log_time(纳秒时间戳)
  • 若某帧缺少标定或机器人位姿,仍会保存原图,只是不绘制坐标轴

常见问题

导出较慢?
默认仅导出 camera2,通常比导出全部相机快很多。可用 --cameras 指定需要的相机。

图像上没有坐标轴?
可能该帧缺少 camera_inforobot_info 数据,程序仍会保存原图。

重新导出前清理旧文件:

rm -rf output/*

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