TDI(Time Delay Integration)は、CCDの特殊な読み出し方式です。CCDでは電荷読み出しの時、1ライン単位で垂直転送を行います。この転送のタイミングとCCD面に入射している対象像が移動するタイミングを合わせれば、CCDの垂直段数だけ露光することができます。この方式をTDIと言い、移動物体を高速かつ高感度で撮像することが可能です。
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