智能车制作

标题: 为什么用视频解码芯片? [打印本页]
作者: 闫红宇    时间: 2007-8-23 03:58
标题: 为什么用视频解码芯片?
<><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: Verdana; mso-fareast-font-family: 宋体; mso-bidi-font-family: &#39;Times New Roman&#39;; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><?xml:namespace prefix = v ns = "urn:schemas-microsoft-com:vml" /><v:shapetype id=_x0000_t75 stroked="f" filled="f" path="m@4@5l@4@11@9@11@9@5xe" o:preferrelative="t" o:spt="75" coordsize="21600,21600">&nbsp;<v:stroke joinstyle="miter"></v:stroke><v:formulas><v:f eqn="if lineDrawn pixelLineWidth 0"></v:f><v:f eqn="sum @0 1 0"></v:f><v:f eqn="sum 0 0 @1"></v:f><v:f eqn="prod @2 1 2"></v:f><v:f eqn="prod @3 21600 pixelWidth"></v:f><v:f eqn="prod @3 21600 pixelHeight"></v:f><v:f eqn="sum @0 0 1"></v:f><v:f eqn="prod @6 1 2"></v:f><v:f eqn="prod @7 21600 pixelWidth"></v:f><v:f eqn="sum @8 21600 0"></v:f><v:f eqn="prod @7 21600 pixelHeight"></v:f><v:f eqn="sum @10 21600 0"></v:f></v:formulas><v:path o:connecttype="rect" gradientshapeok="t" o:extrusionok="f"></v:path><?xml:namespace prefix = o ns = "urn:schemas-microsoft-comffice:office" /><o:lock aspectratio="t" v:ext="edit"></o:lock></v:shapetype><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: Verdana; mso-fareast-font-family: 宋体; mso-bidi-font-family: &#39;Times New Roman&#39;; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><FONT size=4><v:shapetype id=_x0000_t75 stroked="f" filled="f" path="m@4@5l@4@11@9@11@9@5xe" o:preferrelative="t" o:spt="75" coordsize="21600,21600">&nbsp;<v:stroke joinstyle="miter"></v:stroke><v:formulas><v:f eqn="if lineDrawn pixelLineWidth 0"></v:f><v:f eqn="sum @0 1 0"></v:f><v:f eqn="sum 0 0 @1"></v:f><v:f eqn="prod @2 1 2"></v:f><v:f eqn="prod @3 21600 pixelWidth"></v:f><v:f eqn="prod @3 21600 pixelHeight"></v:f><v:f eqn="sum @0 0 1"></v:f><v:f eqn="prod @6 1 2"></v:f><v:f eqn="prod @7 21600 pixelWidth"></v:f><v:f eqn="sum @8 21600 0"></v:f><v:f eqn="prod @7 21600 pixelHeight"></v:f><v:f eqn="sum @10 21600 0"></v:f></v:formulas><v:path o:connecttype="rect" gradientshapeok="t" o:extrusionok="f"></v:path><o:lock aspectratio="t" v:ext="edit"></o:lock></v:shapetype><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: Verdana; mso-fareast-font-family: 宋体; mso-bidi-font-family: &#39;Times New Roman&#39;; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><v:shapetype id=_x0000_t75 stroked="f" filled="f" path="m@4@5l@4@11@9@11@9@5xe" o:preferrelative="t" o:spt="75" coordsize="21600,21600"> 摄相头输出的是模拟信号,经过二值法就能分辨出赛道了.为什么还要用视频解码芯片呢?</v:shapetype></SPAN></FONT></SPAN></SPAN></P><P><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: Verdana; mso-fareast-font-family: 宋体; mso-bidi-font-family: &#39;Times New Roman&#39;; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: Verdana; mso-fareast-font-family: 宋体; mso-bidi-font-family: &#39;Times New Roman&#39;; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><FONT size=4><SPAN lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: Verdana; mso-fareast-font-family: 宋体; mso-bidi-font-family: &#39;Times New Roman&#39;; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><v:shapetype stroked="f" filled="f" path="m@4@5l@4@11@9@11@9@5xe" o:preferrelative="t" o:spt="75" coordsize="21600,21600">哪位高人指点下?</v:shapetype></SPAN></FONT></SPAN></SPAN></P>
作者: auto    时间: 2008-1-6 06:04
标题: Re:为什么用视频解码芯片?
分离行与场信号
作者: yhxiao321    时间: 2008-1-12 18:21
标题: Re:为什么用视频解码芯片?
看你摄象头是怎么按的了,要 分离行厂同步,相当电容电阻
作者: auto    时间: 2008-1-12 18:28
标题: Re:为什么用视频解码芯片?
<>如果是模拟的CCD,行与场信号是必须分离的</P>
作者: demon    时间: 2008-1-15 00:41
标题: Re:为什么用视频解码芯片?
是为了让单片机知道什么时候该采集有效象素数据了~~~
作者: liuyiran    时间: 2008-1-21 08:00
标题: Re:为什么用视频解码芯片?
它只负责同步。
作者: haer    时间: 2008-1-21 19:21
标题: Re:为什么用视频解码芯片?
<>摄象头以一定的分辨率扫描图象的同时，根据内部的图象传感器芯片将所扫描图象的灰度转换成与灰度一一对应的电压值，这其中就包含&nbsp; 场同步信号和行同步信号等，而<FONT face=Verdana>视频解码芯片的作用是提取出这些同步信号，从而保证单片机所处理信号的正确性。呵呵，我是参看学做智能车P182页和P186页做出的解释，不知道解释是不是正确的，还忘大家指正哈。</FONT></P>



欢迎光临 智能车制作 (http://111.231.132.190/) Powered by Discuz! X3.2