function?x1=coordinate_transform（hthetaalphaxm）
%?函數名稱：coordinate_transform
%?參數說明：輸入h為攝像機距離路面高度，
%??????????theta為攝像機視角，
%??????????alpha為攝像機與路面夾角
%??????????x為變換前圖片坐標，
%??????????m為圖像高度，
%??????????x1為實際路面距離
%?功能描述：將圖像坐標變換為實際路面坐標，以便計算車輛行駛速度
%?參考設置：h=8;
%??????????theta=40;
%??????????alpha=30;
%??????????x=180;
%??????????m=240;
%?備注：???圖見攝像機坐標變換.doc
%?版本號：?v1.0
%?[mn]=size（img）;
%%?坐標變換
h=double（h）;
theta=double（theta）;
alpha=double（alpha）;
x=double（x）;
theta=theta*pi/180;
alpha=alpha*pi/180;
angleABC=double（pi/2-（pi/2-alpha+theta/2））;
angleCAD=pi/2-alpha-theta/2;
AD=h/（cos（angleCAD））;
angleAED=pi/2-theta/2;
AE=AD;
DE=2*AD*sin（theta/2）;
x=DE*x/m;
AH=（AE^2+x^2-2*AE*x*cos（angleAED））^0.5;
sin_angleIAB=x*sin（angleAED）/AH;
angleIAB=asin（sin_angleIAB）;
angleAIB=pi-angleABC-angleIAB;
angleCAB=pi/2-alpha+theta/2;
AB=h/cos（angleCAB）;
x1=AB*sin_angleIAB/sin（angleAIB）;
%x1=uint8（x1）;
end

?屬性????????????大小?????日期????時間???名稱
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?????文件???????1029??2013-07-08?21:16??車輛檢測version1.0\coordinate_transform.asv

?????文件???????1054??2013-07-08?21:16??車輛檢測version1.0\coordinate_transform.m

?????文件???11763200??2013-07-08?21:16??車輛檢測version1.0\highwayII_raw.AVI

?????文件????????432??2013-07-08?21:16??車輛檢測version1.0\hist_minmax.asv

?????文件????????465??2013-07-08?21:16??車輛檢測version1.0\hist_minmax.m

?????文件???????6860??2013-07-08?21:16??車輛檢測version1.0\main.asv

?????文件???????7019??2013-07-08?21:16??車輛檢測version1.0\main.m

?????文件???????1511??2013-07-08?21:16??車輛檢測version1.0\otsu.asv

?????文件???????1638??2013-07-08?21:16??車輛檢測version1.0\otsu.m

?????文件???????1799??2013-07-08?21:16??車輛檢測version1.0\search.asv

?????文件???????1799??2013-07-08?21:16??車輛檢測version1.0\search.m

?????目錄??????????0??2013-09-04?15:35??車輛檢測version1.0

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?????????????11786806????????????????????12