The chart is printed with ink-jet process on high quality semi-gloss paper
The paper size is 24
The chart active area is 16.75
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Log Frequency Contrast?Chart(對數(shù)頻率反差測試卡)檢測信號處理的效果——降低噪聲和銳化——通過圖像系統(tǒng)性能,在水平軸上區(qū)分空間頻率(對數(shù)頻率隨x增大而增大)以及在垂直軸向上區(qū)分調(diào)制信號。調(diào)制信號與圖像的高h關(guān)系為與(y/h)2成正比。因為Log F-Contrast?測試卡的結(jié)果是正弦曲線,其調(diào)制相當(dāng)于SFR或者MTF。