The difference between YPbPr and YCbCr

Hello everyone , I meet you again , I'm your friend, Quan Jun .

I'm doing component video input these days , Involving component video representation , Come into contact with YPbPr and YCbCr The concept of , It's not just your own projects , These two concepts are confused , Even the Internet is full of a lot of wrong statements .

Component interfaces have two names YPbPr and YCbCr, These are two completely different concepts ,YCbCr The concept predates YPbPr.

history

In the early DVD It is displayed interlaced , Use YUV(YCbCr) Color space for data storage and transmission , Compared with RGB The advantage is to reduce storage space and data transmission bandwidth , At the same time, it can be easily compatible with black-and-white TV . Therefore, almost all have component output DVD The component terminals of the machine are marked YCbCr(YUV), Everything seems reasonable , However, this buried the root of future conceptual confusion . Until one day, line by line DVD There is , Manufacturers have made it difficult to identify line by line component terminals , Until American Standards YPbPr Appearance , Many manufacturers use YPbPr Indicates line by line , use YCbCr Indicates interlaced . This is against the law. YPbPr standard ,YPbPr The American Standard only identifies the analog video component interface , Support 525i, 625i, 525p, 625p, 720i, 720p etc. , There is no distinction between line by line or interlaced .

Correct representation

YUV(YCbCr) yes 525i/625i（480i/576i） Interlaced component input interface

YPbPr It's from 480i To 720p Component input interface standard （ Do not separate rows and line by line ）, The interlaced component terminal and the progressive component terminal share , The terminal identification is YPbPr, Both interlaced and progressive component signals are input from this port .

Error representation

1. The interlaced component terminal and the progressive component terminal are set separately .YCbCr Indicates the interlaced component terminal ,YPbPr Indicates line by line component terminal

2. The interlaced component terminal and the progressive component terminal share , use YPbPr/YCbCr Express , Both interlaced and progressive component signals are input from this terminal

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