%%?圖像預處理
clear?all;
image=imread（‘chepai2.jpg‘）;
figure（1）subplot（331）imshow（image）;title（‘原圖‘）;
I1=rgb2gray（image）;
figure（1）subplot（332）imshow（I1）;title（‘灰度圖‘）;
figure（1）subplot（333）imhist（I1）;title（‘灰度圖直方圖‘）;
I2=edge（I1‘sobel‘0.15‘both‘）;
figure（1）subplot（334）imshow（I2）;title（‘算子邊緣檢測‘）;
se=[1;1;1];
I3=imerode（I2se）;
figure（1）subplot（335）imshow（I3）;title（‘腐蝕后圖像‘）;
se=strel（‘rectangle‘[2020]）;
I4=imclose（I3se）;
figure（1）subplot（336）imshow（I4）;title（‘閉運算后‘）;
I5=bwareaopen（I42000）;
figure（1）subplot（337）imshow（I5）;title（‘從對象中移除小對象‘）;
se?=?strel（‘rectangle‘[50?80]）;
I6?=?imdilate（I5se）;
figure（1）subplot（338）;imshow（I6）;title（‘膨脹處理‘）;
%%

%%?定位車牌

%%%%%%%%%%%%%%%%%%%%%%%%%%%%?找出長寬比在2~4的區域?%%%%%%%%%%%%%%%%%%%%%%%%%%
ed=edge（I6）;
L?=?bwlabel（I6）;%標記連通域
L1?=?bwlabel（ed）;
p=zeros（1max（L1（:）））;
for?i=1:max（L（:））%得到連通域的長寬比
????p（i）=sum（ed（L==i））;
????[yx]=find（L==i）;
????x0=min（x（:））;
????x1=max（x（:））;
????y0=min（y（:））;
????y1=max（y（:））;
????bl=（x1-x0）/（y1-y0）;
????if?bl>2&&bl<4
????????X0?=?x0;
????????X1?=?x1;
????????Y0?=?y0;
????????Y1?=?y1;
????end
end
I7=imcrop（image[X0Y0X1-X0Y1-Y0]）;
figure（1）subplot（339）;imshow（I7）;title（‘裁剪后圖像‘）;
?
%%%%%%%%%%%%%%%%%%%%%%%%%%%%?根據藍色像素點定位車牌位置%%%%%%%%%%%%%%%%%%%%%
[xyz]=size（I7）;
%?以下為找車牌Y方向藍色的范圍
Blue_y=zeros（y1）;%?zeros（MN）?表示的是M行*N列的全0矩陣
for?i=1:x????
????for?j=1:y?????????
????????if（I7（ij3）>（I7（ij1）+I7（ij2））&&（I7（ij3）>128））%%?判斷藍色像素???????????
????????????Blue_y（j1）=?Blue_y（j1）+1;%?藍色像素點統計??????????
????????end???????
????end???????
end
PY1=1;?
while?（（Blue_y（PY11）<10）&&（PY1????PY1=PY1+1;??%PY1是Y坐標方向藍色范圍的下限
end???
PY2=y;?
while?（（Blue_y（PY21）<10）&&（PY2>PY1））????????
????PY2=PY2-1;?%PY2是Y坐標方向藍色范圍的上限
end???

%?以下為找車牌X方向藍色的范圍
Blue_x=zeros（1x）;
for?i=1:x?????
????for?j=1:y??%?只需掃描的行?????????
????????if（I7（ij3）>（I7（ij1）+I7（ij2））&&（I7（ij3）>128））?%%?判斷藍色像素????????????
????????????Blue_x（1i）=?Blue_x（1i）+1;?%?藍色像素點統計??????????????????????
????????end??????
????end???
end
PX1=1;
while?（（Blue_x（1PX1）<5）&&（PX1???????PX1=PX1+1;?%PX1是X坐標方向藍色范圍的下限
end????
PX2=x;
while?（（Blue_x（1PX2）<3）&&（PX2>PX1））?
???????PX2=PX2-1;?%PX2是X坐標方向藍色范圍的上限
end????
I8=I7（PX1:PX2PY1:PY2:）;%?裁剪圖像
figure（2）;imshow（I8）title（‘定位剪切后的彩色車牌圖像‘）;
%%?

%%?傾斜矯正

I9=rgb2gray（I8）;
figure（4）subplot（221）;imshow（I9）;title（‘灰度圖‘）;
I10=edge（I9）;
figure（4）subplot（222）;imshow（I10）;title（‘邊緣檢測‘）;
theta=1:180;????
[Rxp]=radon（?I10theta）;
[I0J]=find（R>=max（max（R）））;%找傾斜角
qxj=90-J;
I11=imrotate（I8qxj‘bilinear‘‘crop‘）;
figure（4）subplot（223）;imshow（I8）;title（‘原圖‘）;
figure（4）subplot（224）;imshow（I11）;title（‘傾斜矯正‘）;
thresh?=?graythresh（I9）;?????%自動確定二值化閾值；
I12?=?im2bw（I9thresh）;?
figure（5）subplot（121）;imshow（I12）;title（‘二值化‘）;
I13=imrotate（I12qxj‘bilinear‘‘crop‘）;
figure（5）subplot（122）;imshow（I13）;t

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2019-12-07?16:44??周鵬-2019250068-機電學院-車牌識別\
?????目錄???????????0??2019-12-07?16:29??周鵬-2019250068-機電學院-車牌識別\charSamples\
?????目錄???????????0??2019-12-07?16:29??周鵬-2019250068-機電學院-車牌識別\charSamples\0\
?????文件?????????376??2013-11-07?08:35??周鵬-2019250068-機電學院-車牌識別\charSamples\0\10_0.792674_gray_14967_5950_step5_recog_4_0_0.890217_0.705652.png
?????文件?????????413??2013-11-10?08:12??周鵬-2019250068-機電學院-車牌識別\charSamples\0\11_0.971377_gray_20751_8531_step5_recog_4_0_0.996446_0.967925.png
?????文件?????????413??2013-11-09?08:47??周鵬-2019250068-機電學院-車牌識別\charSamples\0\12_0.953826_gray_975_407_step5_recog_5_0_0.987086_0.941508.png
?????文件?????????376??2013-11-06?07:31??周鵬-2019250068-機電學院-車牌識別\charSamples\0\13_0.924615_gray_5457_2092_step5_recog_6_0_0.987233_0.912810.png
?????文件?????????413??2013-11-07?10:29??周鵬-2019250068-機電學院-車牌識別\charSamples\0\14_0.749970_gray_17934_7138_step5_recog_4_0_0.787806_0.590831.png
?????文件?????????398??2013-11-07?01:38??周鵬-2019250068-機電學院-車牌識別\charSamples\0\15_0.877296_gray_8040_2899_step5_recog_4_0_0.969689_0.850704.png
?????文件?????????390??2013-11-09?16:11??周鵬-2019250068-機電學院-車牌識別\charSamples\0\16_0.949891_gray_12542_5631_step5_recog_5_0_0.989526_0.939942.png
?????文件?????????413??2013-11-05?23:09??周鵬-2019250068-機電學院-車牌識別\charSamples\0\17_0.906434_gray_1645_517_step5_recog_3_0_0.985269_0.893081.png
?????文件?????????413??2013-11-04?07:38??周鵬-2019250068-機電學院-車牌識別\charSamples\0\18_0.494551_gray_4696_2106_step5_recog_5_D_0.340885_0.168585.png
?????文件?????????413??2013-11-10?17:49??周鵬-2019250068-機電學院-車牌識別\charSamples\0\19_0.968513_gray_35240_14963_step5_recog_4_0_0.994962_0.963633.png
?????文件?????????390??2013-11-05?11:37??周鵬-2019250068-機電學院-車牌識別\charSamples\0\1_0.822474_gray_13564_5332_step5_recog_2_0_0.891312_0.733081.png
?????文件?????????452??2013-11-07?09:17??周鵬-2019250068-機電學院-車牌識別\charSamples\0\20_0.737201_gray_16436_6504_step5_recog_3_0_0.828133_0.610500.png
?????文件?????????328??2013-11-09?09:13??周鵬-2019250068-機電學院-車牌識別\charSamples\0\21_0.750968_gray_1741_702_step5_recog_5_0_0.724394_0.543997.png
?????文件?????????578??2013-11-06?07:23??周鵬-2019250068-機電學院-車牌識別\charSamples\0\22_0.610848_gray_4813_1822_step5_recog_6_0_0.772820_0.472076.png
?????文件?????????429??2013-11-08?21:58??周鵬-2019250068-機電學院-車牌識別\charSamples\0\23_0.976079_gray_9338_3994_step5_recog_4_0_0.996512_0.972675.png
?????文件?????????404??2013-11-05?10:21??周鵬-2019250068-機電學院-車牌識別\charSamples\0\24_0.876098_gray_12240_4810_step5_recog_6_0_0.960593_0.841573.png
?????文件?????????398??2013-11-10?13:17??周鵬-2019250068-機電學院-車牌識別\charSamples\0\25_0.978677_gray_28271_11796_step5_recog_3_0_0.997614_0.976341.png
?????文件?????????845??2013-11-07?07:07??周鵬-2019250068-機電學院-車牌識別\charSamples\0\26_0.915550_gray_9737_3597_step5_recog_6_0_0.984816_0.901648.png
?????文件?????????413??2013-11-06?16:41??周鵬-2019250068-機電學院-車牌識別\charSamples\0\27_0.942230_gray_2943_1159_step5_recog_4_0_0.982740_0.925967.png
?????文件?????????390??2013-11-06?07:09??周鵬-2019250068-機電學院-車牌識別\charSamples\0\28_0.845480_gray_4035_1484_step5_recog_2_0_0.902136_0.762738.png
?????文件?????????436??2013-11-07?08:11??周鵬-2019250068-機電學院-車牌識別\charSamples\0\29_0.736003_gray_13772_5440_step5_recog_4_0_0.816986_0.601304.png
?????文件?????????413??2013-11-04?17:45??周鵬-2019250068-機電學院-車牌識別\charSamples\0\2_0.734930_gray_10773_4652_step5_recog_6_0_0.932386_0.685239.png
?????文件?????????595??2013-11-08?12:21??周鵬-2019250068-機電學院-車牌識別\charSamples\0\30_0.669019_gray_4754_2801_step5_recog_4_0_0.669949_0.448209.png
?????文件?????????443??2013-11-04?11:41??周鵬-2019250068-機電學院-車牌識別\charSamples\0\31_0.941303_gray_3574_1589_step5_recog_5_0_0.991813_0.933597.png
?????文件?????????390??2013-11-10?14:35??周鵬-2019250068-機電學院-車牌識別\charSamples\0\32_0.910823_gray_30504_12844_step5_recog_2_0_0.938536_0.854839.png
?????文件?????????413??2013-11-09?00:43??周鵬-2019250068-機電學院-車牌識別\charSamples\0\33_0.944410_gray_10675_4406_step5_recog_5_0_0.977869_0.923509.png
?????文件?????????443??2013-11-04?10:34??周鵬-2019250068-機電學院-車牌識別\charSamples\0\34_0.913401_gray_2467_1090_step5_recog_3_0_0.986072_0.900679.png
?????文件?????????376??2013-11-05?07:53??周鵬-2019250068-機電學院-車牌識別\charSamples\0\35_0.908210_gray_6976_2539_step5_recog_4_0_0.974391_0.884952.png
............此處省略1795個文件信息