特殊用法back clamping1.反向箝位black-level clamping1.黑电平箝位horizontal clamping1.水平钳位line-by-line clamping1.逐行箝位negative clamping1.负向箝位, 负(脉冲)箝位soft clamping1.软钳位synchronized clamping1.同步(电平)箝位