再來個範例說明, 下圖是一段錄下來的MPEG2檔案, 屬於場景較暗的畫面, 看起來可能有點辛苦, 但我有放大說明. 原來檔案是 "交錯" 格式, 請參考下圖



做局部放大給大家看會比較清楚

可以由白色衣領部份看出來, 剛好兩兩相錯, 很明顯第一個場(Field)和第二個場交差顯示後有很大的差異.

此時我們開啟軟體做 "去交錯" 後請參考下圖.


做 "去交錯" 後更暗了, 再做局部放大如下圖

隱約可以看到兩個白色衣領出現.

可是有時在做 "去交錯" 時會發生 "顏色" 殘影. 這現象說明要借用一下圖
(原圖出處 : http://www.100fps.com/)

我們一樣發現這個快速動作的畫面, 也出現的 "交錯" 現象.

但重點是, 做了去交錯之後, 請參考下圖.

發現上圖的 "紅", "綠" 色依然留著殘影, 原因是 "去交錯" 時沒有將這兩個地方做處理, 為何會如此呢? 引用原文的說明如下. (保持作者的原意)

....
To make things even more complicated, some digital camcorders have something you could call "color interlacing". While this term maybe somewhat inaccurate to describe the source of the artefacts, it is quite descriptive for the end result.
....
But even after deinterlacing some red and some green pixels stay where the last field was.
....

Some camcorders mix different colors into different fields, or use CCDs that react slower, so that you get this strange color patterns sometimes.
Furthermore there are camcorders with known "hardware bugs" that produce a color halo or a color bleeding or a color smearing (the example above was filmed with a Sony PC110, that has this known "color behaviour").
Furthermore there is something like color unsharpness resulting from the fact, that color resolution is lower than the picture resolution, meaning for example that 4 pixels share 1 color.
Furthermore there are color aberrations introduced by the camcorder's lens system.
......

以上文字說明是配合作者的圖示, 可以參考原網址的圖文參照解釋.

除了圖像會有交錯現象外, 還有顏色交錯 (color interlaced) 與亮度交錯(brightness interlaced)
參考資料 : http://zh.wikipedia.org/wiki/%E5%8E...%BA%A4%E9%8C%AF