ThresholdTool 0 0 380 392 Dialog 低阈值: 0 0 99999 99999 255 Qt::Horizontal 0 0 Qt::Horizontal 127 20 0 0 99999 99999 255 Qt::Horizontal 高阈值: 0 0 100 0 100 16777215 黑白反转 Qt::Horizontal 127 20