https://en.wikipedia.org/wiki/1080i
http://www.cnblogs.com/my_life/articles/6543311.html
http://baike.baidu.com/item/1080p
1080i (a.k.a. FHD and BT.709) is an abbreviation referring to a combination of frame resolution and scan type, used in high-definition television (HDTV) and high-definition video.
The number "1080" refers to the number of horizontal lines on the screen.
The "i" is an abbreviation for "interlaced";隔行掃描 this indicates that only the odd lines, then the even lines of each frame (each image called a video field) are drawn alternately, so that only half the number of actual image frames are used to produce video.
A related display resolution is 1080p, 逐行掃描which also has 1080 lines of resolution; the "p" refers to progressive scan, which indicates that the lines of resolution for each frame are "drawn" in on the screen sequence.
Within the designation "1080i", the i stands for interlaced scan. A frame of 1080i video consists of two sequential fields of 1920 horizontal and 540 vertical pixels. The first field consists of all odd-numbered TV lines and the second all even numbered lines. Consequently, the horizontal lines of pixels in each field are captured and displayed with a one-line vertical gap between them, so the lines of the next field can be interlaced between them, resulting in 1080 total lines. 1080i differs from 1080p, where the p stands for progressive scan, where all lines in a frame are captured at the same time.
i :隔行掃描,包含兩個場,第一個場由奇數行組成,第二個場由偶數行組成。
p: 逐行掃描,一個幀內的所有的行同時被捕捉。
HDMI1 1080I50是什么意思
HDMI1是你的HDMI連接接口的1號通道,1080i 是一種高清晰度電視信號格式,比1080P低一個檔次,不過也屬於高清,比720P好。50是50HZ(赫茲)。這樣的參數播放高清電影效果已經很好了。如果是1080P,60HZ就更好了。畫面好與不好,與片源也有大關系。
機頂盒設置1080p60赫茲和50赫茲有什么區別
刷新率越高,所顯示的圖象(畫面)穩定性就越好。 刷新率高低將直接決定其價格,但是由於刷新率與分辨率兩者相互制約,因此只有在高分辨率下達到高刷新率這樣的顯示器才能稱其為性能優秀。
一般液晶電視都是60HZ,所以你選1080P60赫茲就行了。
--------------視頻幀率--------------
一、介紹
視頻幀率(Frame rate)是用於測量顯示幀數的量度。所謂的測量單位為每秒顯示幀數(Frames per Second,簡:FPS)或“赫茲”(Hz)。此詞多用於影視制作和電子游戲。
由於人類眼睛的特殊生理結構,如果所看畫面之幀率高於16的時候,就會認為是連貫的,此現象稱之為視覺停留。這也就是為什么電影膠片是一格一格拍攝出來,然后快速播放的。
而對游戲,一般來說,第一人稱射擊游戲比較注重FPS的高低,如果FPS<30的話,游戲會顯得不連貫。所以有一句有趣的話:“FPS(指FPS游戲)重在FPS(指幀率)。
每秒的幀數(fps)或者說幀率表示圖形處理器處理場時每秒鍾能夠更新的次數。高的幀率可以得到更流暢、更逼真的動畫。
一般來說30fps就是可以接受的,但是將性能提升至60fps則可以明顯提升交互感和逼真感,但是一般來說超過75fps一般就不容易察覺到有明顯的流暢度提升了。如果幀率超過屏幕刷新率只會浪費圖形處理的能力,因為監視器不能以這么快的速度更新,這樣超過刷新率的幀率就浪費掉了。
二、 在媒體中幀率有:
電影:23.976fps
電視(PAL):25fps
電視(NTSC):29.97fps
CRT顯示器:60Hz-85Hz
液晶顯示器:60Hz-75Hz
3D顯示器: 120Hz
三、影響因素
既然刷新率越快越好,為什么還要強調沒必要追求太高的刷新率呢?
其中原因是在顯示‘分辨率’不變的情況下,FPS越高,則對顯卡的處理能力要求越高。
電腦中所顯示的畫面,都是由顯卡來進行輸出的,因此屏幕上每個像素的填充都得由顯卡來進行計算、輸出。
當畫面的分辨率是1024×768時,畫面的刷新率要達到24幀/秒,那么顯卡在一秒鍾內需要處理的像素量就達到了“1024×768×24=18874368”。
如果要求畫面的刷新率達到50幀/秒,則數據量一下子提升到了“1024×768×50=39321600”。
FPS與分辨率、顯卡處理能力的關系如下:
處理能力=分辨率×刷新率。這也就是為什么在玩游戲時,分辨率設置得越大,畫面就越不流暢的原因了。
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http://www.filmaker.cn/thread-55909-1-1.html
http://en.wikipedia.org/wiki/Progressive_segmented_frame
Progressive segmented Frame (PsF, sF, SF) is a scheme designed to acquire, store, modify, and distribute progressive scan video using interlaced equipment and media.
With PsF, a progressive frame is divided into two segments, with the odd lines in one segment and the even lines in the other segment. Technically, the segments are equivalent to interlaced fields, but unlike native interlaced video, there is no motion between the two fields that make up the video frame: both fields represent the same instant in time. This technique allows for a progressive picture to be processed through the same electronic circuitry that is used to store, process and route interlaced video.
The PsF technique is similar to 2:2 pulldown, which is widely used in 50 Hz television systems to broadcast progressive material recorded at 25 frame/s, but is rarely used in 60 Hz systems. The 2:2 pulldown scheme had originally been designed for interlaced displays, so fine vertical details are usually filtered out to minimize interline twitter. PsF has been designed for transporting progressive content and therefore does not employ such filtering.
The term progressive segmented frame is used predominantly in relation to high definition video. In the world of standard definition video, which traditionally has been using interlaced scanning, it is also known as quasi-interlace[1] or progressive recording.[2]
PsF本質上就是逐行P,只不過把一個逐行幀拆成兩個場傳輸罷了,下拉之后完美復原為純逐行信號。
http://bbs.zunzheng.cn/forum.php ... &extra=page%3D1 Psf(Progressive segmented frame - 逐行分段傳輸)
Psf和P方式是逐行掃描信號的兩種傳輸方式,從信號本身來說 P與 Psf傳輸的內容沒有任何差別,其差別是傳輸方式不同。
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https://blog.huiyiqun.me/2016/10/31/notes-about-media-streams.html
interlaced/progressive
視頻的分辨率里常常有p和i的區別,比如1080p和1080i等。這里的p和i就是指progressive和interlaced。這兩個概念其實十分簡單。
以前的視頻信號主要是模擬信號,並且受到接收端的限制,傳輸過程中是不作壓縮的,所以帶寬嚴重限制了傳輸過程中的碼率。 因此,有人就想出了利用視覺停留等現象,降低傳輸碼率的方法,這就是interlaced。
也就是對於相鄰兩幀,分別只取奇數行和偶數行, 將兩幀合並為一幀,這樣傳輸過程中的碼率就降低到了原來的一半。需要注意的是,這種掃描方式通常是和硬件實現結合在一起的。
然而,隨着現在數字電視及互聯網的普及,接收端越來越智能,可以勝任越來越復雜的解碼工作,因此編碼端可以使用更復雜高效的方式對視頻進行編碼, 人們發現相比於interlaced的方式,每一幀都取完整的一幀,編碼出來的碼率反而更低(為什么?因為引入了一些額外的高頻分量)。這種取完整幀的方式就是progressive。
所以一般來說,現在更流行的分辨率通常是以p結尾,以i結尾的分辨率已經很少了。但是由於歷史遺留問題和實現的原因(i比p硬件上更容易實現), 很多視頻設備輸出的視頻依然是interlaced的。
另外,需要注意到的是,interlaced的視頻,其奇數行和偶數行的內容分別為兩個field,這個概念在編碼的過程中也會遇到。