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發表於 2011-2-15 00:29:56
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本文章最後由 lsjean 於 2011-2-15 01:05 編輯
多謝前輩指點>"< 小弟跳過前面沒看到被抓包了QQ
"不需增加額外頻寬"我會補上,之前常常忘記頻寬這件事…
不過"doubling the perceived frame rate"這段我不太理解
兩個field先後出現,對我們而言應該還是覺得看到一個frame
但依他的說法,會有frame增倍的感覺?
還是說,當第一個field出現時(畫面還有一半是黑的)
我們就會覺得看到一個frame了?
要是考慮到拍攝時每個field的時間都不一樣,好像也說得通?
然後我又看到這段:
A field is an image that contains only half of the lines needed to make a complete picture. The afterglow of the phosphor of CRTs, in combination with the persistence of vision results in two fields being perceived as a continuous image which allows the viewing of full horizontal detail with the same bandwidth that would be required for a full progressive scan but with twice the perceived frame rate and with the necessary CRT refresh rate to prevent flicker.
又說兩個field會被認為是一個連續的影像…?
要是他的意思是指60i看起來會像60p一樣流暢,只是沒那麼清晰,那我就理解了 |
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