Question

我在MATLAB中进行板的数字提取。有两种号牌，一种是带有pwd符号的另一种没有它。我输出8个字符。如果输出中没有pwd符号，则我的预期输出为6个字符，否则从右到左依次为7。我的示例输出是14184940和0PwDsymbol012345。我正在使用＆＃39; strfind＆＃39;检查输出中是否显示pwddymbol。如何截断输出字符？此代码用于识别号码。

function strPlate = Recognition(Objects,ImgChar)
% clc;
% clear all;
global templates;
load templates;
strPlate=[];
    I=imread('images.jpg');
%     I=imread('2222.jpg');
    figure,imshow(I);
    [ImgPlate] = LocationPlate(I);
    [Objects,ImgChar]=Segmentation(ImgPlate);
    num_letras=size(templates,2);
    for i=1:Objects
    char=ImgChar(:,:,i);
    char=imresize(char,[100 100]);
    char = medfilt2(char,[3 3]);
    figure,imshow(char);title('filtered')
    % use adaptive histogram equalisation
    char = adapthisteq(char);
       % contrast stretching
    char = imadjust(char);
    se=strel('disk',1); % Structural element (disk of radius 1) for morphological processing.
chari=imdilate(char,se); % Dilating the gray image with the structural element.
% figure,imshow(chari);
% title('chari')
chare=imerode(char,se); % Eroding the gray image with structural element.
gdiff=mat2gray(chare); % Converting the class to double.
gdiff=conv2(gdiff,[1 1;1 1]); 
gdiff=imadjust(gdiff,[0.5 0.7],[0 1],0.1); % Intensity scaling between the range 0 to 1.
H=bwmorph(gdiff,'thin',1);
final=imresize(H,[100,100]);
letter=read_letter(final,num_letras);
strPlate=[strPlate letter ];
end
locations = strfind(strPlate, 'PwDsymbol');
fid = fopen('noPlate.txt', 'wt'); 
if isempty(locations)
fprintf(fid,'%s\n','number plate has no PwD symbol hence violation.\n');
else
fprintf(fid,'%s\n','number plate has PwD symbol hence no violation.\n'); 
end
fclose(fid);                     
winopen('noPlate.txt')

Answer 1

您没有指定截断是否必须在字符串的开头或结尾处发生。无论如何，一旦你知道如何执行截断，这是一个边缘问题。

假设您要从字符串中删除第一个字符（确切地说，是字符数组）：

s = '0PwDsymbol012345';
s = s(2:end); % Output: 'PwDsymbol012345'

假设您想要从字符数组中删除最后两个字符：

s = '14184940';
s = s(1:end-2); % Output: '141849'

这就是全部。现在，您可以根据需要自由调整字符串截断过程。无论如何，在继续进行截断之前，建议对字符串长度进行健全性检查，这样您的输出就不会被弄乱...即使截断溢出产生空字符串：

s = '12345';
s = s(1:end-10); % Output: ''

matlab

1 个答案: