matlab车牌识别代码运用GUI

将车牌识别代码嵌入 MATLAB GUI 的过程可以分为以下几个步骤：

1. 创建 GUI 界面并添加图像显示控件
2. 添加选择图像按钮，并编写回调函数实现图像选择和显示
3. 添加车牌识别按钮，并编写回调函数实现车牌识别和结果显示

下面是一个简单的 MATLAB GUI 代码示例，可以实现车牌识别功能。代码中涉及到的车牌识别算法和技术同上一个回答中的示例代码一致，只是将其包装在了 GUI 界面中。

function varargout = PlateRecognitionGUI(varargin)
% PLATERECOGNITIONGUI MATLAB code for PlateRecognitionGUI.fig
%      PLATERECOGNITIONGUI, by itself, creates a new PLATERECOGNITIONGUI or raises the existing
%      singleton*.
%
%      H = PLATERECOGNITIONGUI returns the handle to a new PLATERECOGNITIONGUI or the handle to
%      the existing singleton*.
%
%      PLATERECOGNITIONGUI('CALLBACK',hObject,eventData,handles,...) calls the local
%      function named CALLBACK in PLATERECOGNITIONGUI.M with the given input arguments.
%
%      PLATERECOGNITIONGUI('Property','Value',...) creates a new PLATERECOGNITIONGUI or raises the
%      existing singleton*.  Starting from the left, property value pairs are
%      applied to the GUI before PlateRecognitionGUI_OpeningFcn gets called.  An
%      unrecognized property name or invalid value makes property application
%      stop.  All inputs are passed to PlateRecognitionGUI_OpeningFcn via varargin.
%
%      *See GUI Options on GUIDE's Tools menu.  Choose "GUI allows only one
%      instance to run (singleton)".
%
% See also: GUIDE, GUIDATA, GUIHANDLES

% Edit the above text to modify the response to help PlateRecognitionGUI

% Last Modified by GUIDE v2.5 08-Sep-2021 23:48:44

% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @PlateRecognitionGUI_OpeningFcn, ...
                   'gui_OutputFcn',  @PlateRecognitionGUI_OutputFcn, ...
                   'gui_LayoutFcn',  [] , ...
                   'gui_Callback',   []);
if nargin && ischar(varargin{1})
    gui_State.gui_Callback = str2func(varargin{1});
end

if nargout
    [varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});
else
    gui_mainfcn(gui_State, varargin{:});
end
% End initialization code - DO NOT EDIT


% --- Executes just before PlateRecognitionGUI is made visible.
function PlateRecognitionGUI_OpeningFcn(hObject, eventdata, handles, varargin)
% This function has no output args, see OutputFcn.
% hObject    handle to figure
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
% varargin   command line arguments to PlateRecognitionGUI (see VARARGIN)

% Choose default command line output for PlateRecognitionGUI
handles.output = hObject;

% Update handles structure
guidata(hObject, handles);

% UIWAIT makes PlateRecognitionGUI wait for user response (see UIRESUME)
% uiwait(handles.figure1);

% 初始化变量
handles.img = [];
handles.plateNumber = '';

% 显示空白图像
axes(handles.axes1);
imshow(zeros(480, 640, 3));

% --- Outputs from this function are returned to the command line.
function varargout = PlateRecognitionGUI_OutputFcn(hObject, eventdata, handles) 
% varargout  cell array for returning output args (see VARARGOUT);
% hObject    handle to figure
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Get default command line output from handles structure
varargout{1} = handles.output;


% --- Executes on button press in pushbutton1.
function pushbutton1_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% 打开文件选择对话框
[filename, pathname] = uigetfile({'*.jpg;*.png;*.bmp', 'Image Files (*.jpg,*.png,*.bmp)'}, 'Select an Image File');
if isequal(filename, 0) || isequal(pathname, 0)
    return;
end

% 读取图像文件
img = imread(fullfile(pathname, filename));

% 显示图像
axes(handles.axes1);
imshow(img);

% 更新变量
handles.img = img;

% 保存变量
guidata(hObject, handles);


% --- Executes on button press in pushbutton2.
function pushbutton2_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton2 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% 检查图像是否已选择
if isempty(handles.img)
    return;
end

% 图像预处理
gray = rgb2gray(handles.img);
bw = imbinarize(gray);
bw = bwareaopen(bw, 500);

% 车牌定位
stats = regionprops(bw, 'BoundingBox', 'Area');
areas = [stats.Area];
[maxArea, maxIndex] = max(areas);
bbox = stats(maxIndex).BoundingBox;
plate = imcrop(handles.img, bbox);

% 车牌字符分割
grayPlate = rgb2gray(plate);
bwPlate = imbinarize(grayPlate);
bwPlate = imcomplement(bwPlate);
bwPlate = bwareaopen(bwPlate, 10);
bwPlate = imfill(bwPlate, 'holes');
se = strel('rectangle', [5, 5]);
bwPlate = imclose(bwPlate, se);
bwPlate = imerode(bwPlate, se);
bwPlate = bwareaopen(bwPlate, 100);

% 车牌字符识别
ocrResults = ocr(bwPlate, 'CharacterSet', 'ABCDEFGHJKLMNPQRSTUVWXYZ0123456789', 'TextLayout', 'Block');
plateNumber = ocrResults.Text;

% 显示结果
axes(handles.axes1);
imshow(handles.img);
hold on;
rectangle('Position', bbox, 'EdgeColor', 'r', 'LineWidth', 2);
text(bbox(1), bbox(2)-20, plateNumber, 'Color', 'r', 'FontSize', 14);

% 更新变量
handles.plateNumber = plateNumber;

% 保存变量
guidata(hObject, handles);

在 MATLAB 中运行上述代码后，会弹出一个 GUI 界面，包含两个按钮和一个图像显示区域。选择图像按钮可以选择要进行车牌识别的图像文件，并显示在图像显示区域中。车牌识别按钮可以对选择的图像进行车牌识别，并在图像上标出车牌区域和识别结果。识别结果会保存在 GUI 变量 `handles.plateNumber` 中，可以在其他回调函数中使用或者在 GUI 界面中显示。