【图像检测】基于帧差法实现视频运动目标检测matlab源码

matlab科研社

于 2021-07-09 14:27:11 发布

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文章标签：音视频目标检测 matlab 目标跟踪计算机视觉

本文链接：https://blog.youkuaiyun.com/Matlab_dashi/article/details/140115355

视频分割算法可以从时域和空域两个角度考虑。时域分割算法利用视频流时域连续性，通过相邻帧的时域变化来检测运动目标。在摄像头静止的情况下，常用的方法有帧差法和减背景法。

帧差法比较直观实用，对光照的变化干扰不敏感，但是对目标的检测不准确，对于缓慢运动的目标甚至可能无法提取出目标边界，对于快速运动的目标提取出的目标区域又过大。减背景法容易得到目标的准确描述，对静止和非静止的目标都适用，但是背景更新的计算量比较大，还必须建立合适的模型，同时在背景大幅运动的场合也不适用。

空域分割算法利用图像的空域属性( 颜色、亮度、纹理以及边缘信息等) 来提取视频对象。例如基于边缘的目标提取算法，虽然算法能检测出精确的图像边缘，但是检测过程存在较大的盲目性，检测出的边缘不仅包括所需要的运动目标的边缘，连背景中的静止物体的边缘也一并被检测出来，这就给目标分割带来困扰。

采集某一时间段里的视频序列图像，设f( x，y， t) 表示t时刻当前帧，其前后相邻的两帧分别用 f( x，y，t － 1) 和f( x，y，t + 1) 表示。t时刻相邻两帧之间作差分运算：

|f(x,y,t)-f(x,y,t-1)|<T            背景
　　|f(x,y,t)-f(x,y,t-1)|>=T           前景
　　其中f(x,y,t),f(x,y,t-1)分别为t,t-1时刻对应像素点的像素值,T为阈值。

【图像检测】基于帧差法实现视频运动目标检测matlab源码_图像处理

以下图为例：

【图像检测】基于帧差法实现视频运动目标检测matlab源码_图像处理_02

仅根据两帧序列图像间的差分来检测运动目标存在许多问题。如图1 所示，d、e 两帧图像差分的结果中，由于相邻两帧之间的差分并不完全是运动目标，上一帧被运动目标覆盖的背景，会在下一帧显露出来，并被误判为前景目标，这样导致得到的运动目标区域包括背景区域，因此会比实际运动区域大。

在实际应用中，为了后续的运动分析与理解，总希望得到最准确的运动目标，因此本文中采用三帧差分代替两帧差分来实现运动目标检测。三帧差分法利用两帧差分结果Dt，t－1 ( x,y,t) 和 Dt，t + 1 (x,y,t) 的“与”运算确定当前帧f( x,y,t ) 中运动目标边缘D3( x,y,t) ，即

【图像检测】基于帧差法实现视频运动目标检测matlab源码_matlab_03

其中，× 为与运算。图1 是一段subway 视频，图1f为得到的运动目标边缘D3(x,y,t) ，可以看出三帧差分法有效地解决了运动目标的遮挡和背景重现问题，得到了准确的运动目标边缘，并且在一定的程度上抑制了光照、阴影以及噪声的影响。

------------------------------------------------------------------------分界线----------------------------------------------------------------------------------------

经过“与”运算后运动区域中的噪声得到了一定程度的抑制，但在D3(x,y,t) 中还存在着部分孤立的噪声点，若不加处理将影响对运动目标的有效检测。可用邻域平均、中值滤波和高斯低通滤波等方法来抑制噪声。

对于邻域平均法，如把求灰度平均值的邻域取得太大，或反复进行若干次操作，则会使图像模糊，图像的质量也会随之降低。中值滤波不仅能有效滤除图像中的孤立噪声点，与邻域平均法相比还能有效保护边界信息。图2为中值滤波前后的效果图。邻域S 采用大小为3 × 3 的窗口。

【图像检测】基于帧差法实现视频运动目标检测matlab源码_matlab_04

该算法既能保持图像的边缘细节又具有一定的抗噪声能力，有效地克服了经典的一阶和二阶微分边缘检测算子对噪声敏感的缺点。虽然该算法计算开销比较大，但它可以产生最大的梯度边界。 Kirsch 算子从8 个方向对图像边缘信息进行提取。详细的边缘检测算法描述如下: 首先获得如图3 所示的8个滤波模板。

【图像检测】基于帧差法实现视频运动目标检测matlab源码_图像处理_05

下一步的操作有点绕，具体是：将这八个模板依次在图像中一点(x，y)处进行滤波，那么会产生八个值，选出其中的最大值Fmax。按这种取值方法，得到了整幅图的滤波值。

由fmax ( x，y ) 组成滤波图像，基于滤波图像中的极值点可得到极值点图像FImax ( x，y) ，FImax ( x，y) 定义为：

【图像检测】基于帧差法实现视频运动目标检测matlab源码_图像处理_06

FI ( x，y) 表示图像中( x，y) 处的像素值，若 ( x，y ) 在滤波图像中是极值点，则FI ( x，y ) = fmax ( x，y )，否则FI( x，y ) = 0。

根据极值点图像FImax和预设的阈值T，可得到边缘图像EI，EI 定义为：

【图像检测】基于帧差法实现视频运动目标检测matlab源码_图像处理_07

EI( x，y) 表示边缘图像中( x，y) 处的像素值，若FI( x，y) ＞ T，则EI( x，y) = 1，否则，EI( x，y) = 0

在边缘检测时，一些重要的边缘细节由于干扰或对比度不足变得模糊、微弱。直接利用Kirsch 边缘检测获得的边缘线容易出现断点，效果不是很理想。本文中通过图像边缘连续性检测来调节阈值 T，从而得到连通的图像边缘。通常在边缘不连续的地方，象素值会有较大的差异，文中用4 × 4 的方向模板计算目标点周围6个方向上的差值，当最大差值超过某个门限值时，则可认为该点为不连续点，由此来检测图像边缘的不连续性。通过该算法在抑制噪声、保证边缘连续性的同时较好地保护了低强度的边缘细节，获得了令人满意的效果。算法流程图如左图，预设的阈值T 取不同值的情况下，边缘检测效果如右图所示。

【图像检测】基于帧差法实现视频运动目标检测matlab源码_matlab_08

阈值T决定着边缘定位的精度和边缘的连续。T较小时，边缘定位精度高，连续性差，低强度的边缘细节被漏检；T 较大时，情况正好相反，因此，要根据需要调节阈值T。

设D3(x,y) 是经过中值滤波后由三帧差分得到的运动区域掩模，EI(x,y,t) 是由Kirsch 边缘检测算法得到的当前帧的边缘掩模，则最终的运动目标边缘图Mt为：

【图像检测】基于帧差法实现视频运动目标检测matlab源码_matlab_09

结果下图所示：

【图像检测】基于帧差法实现视频运动目标检测matlab源码_matlab_10

由图6可以看出，将时空域相结合可以准确的检测出运动目标的边缘，有效地克服了阴影问题。但所得到的边缘仍存在不连续的问题，需要对运动对象边缘进行连接。

文中采用自适应数学形态学对图像边缘进行连接，对每一个端点，用自适应椭圆结构元素进行自适应膨胀运算，结构元素的大小和方向可根据像素的局部特性如斜率、曲率进行调整，得到膨胀后闭合的运动目标边缘B( x，y，t ) ，因为经过膨胀处理，原图像边缘难免会变宽，因此需要对处理后的B( x，y，t) 图像结合EI( x，y，t ) 重新进行边缘定位，得到最终的闭合的运动目标边缘O(x，y，t) :

【图像检测】基于帧差法实现视频运动目标检测matlab源码_matlab_11

最后，对闭合的运动目标边界O(x，y，t) 进行区域填充，得到运动目标的二值掩模图像，将其与当前帧f( x，y，t) 相结合，便实现了对运动目标的分割，结果上面右图所示。与图1中基于帧差法的分割结果相比较其定位精度高，分割效果好

function varargout = MainFrame(varargin)
% MAINFRAME MATLAB code for MainFrame.fig
%      MAINFRAME, by itself, creates a new MAINFRAME or raises the existing
%      singleton*.
%
%      H = MAINFRAME returns the handle to a new MAINFRAME or the handle to
%      the existing singleton*.
%
%      MAINFRAME('CALLBACK',hObject,eventData,handles,...) calls the local
%      function named CALLBACK in MAINFRAME.M with the given input arguments.
%
%      MAINFRAME('Property','Value',...) creates a new MAINFRAME or raises the
%      existing singleton*.  Starting from the left, property value pairs are
%      applied to the GUI before MainFrame_OpeningFcn gets called.  An
%      unrecognized property name or invalid value makes property application
%      stop.  All inputs are passed to MainFrame_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 MainFrame

% Last Modified by GUIDE v2.5 30-Mar-2014 17:05:13

% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
    'gui_Singleton',  gui_Singleton, ...
    'gui_OpeningFcn', @MainFrame_OpeningFcn, ...
    'gui_OutputFcn',  @MainFrame_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 MainFrame is made visible.
function MainFrame_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 MainFrame (see VARARGIN)

% Choose default command line output for MainFrame
handles.output = hObject;
warning off all;
clc;
handles.videoFilePath = 0;
handles.videoInfo = 0;
handles.videoImgList = 0;
handles.videoStop = 1;
handles.videoTrackFlag = 0;
handles.pts = 0;
handles.tms = 0;
% Update handles structure
guidata(hObject, handles);


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


% --- Outputs from this function are returned to the command line.
function varargout = MainFrame_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 pushbuttonPlay.
function pushbuttonPlay_Callback(hObject, eventdata, handles)
% hObject    handle to pushbuttonPlay (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
% 播放按钮
if isequal(handles.videoFilePath, 0) || isequal(handles.videoInfo, 0)
    msgbox('请先获取视频信息', '提示信息');
    return;
end
[pathstr, name, ext] = fileparts(handles.videoFilePath);
set(handles.pushbuttonPause, 'Enable', 'On');
set(handles.pushbuttonPause, 'tag', 'pushbuttonPause', 'String', '暂停');
set(handles.sliderVideoPlay, 'Max', handles.videoInfo.NumberOfFrames, 'Min', 0, 'Value', 1);
set(handles.editSlider, 'String', sprintf('%d/%d', 0, handles.videoInfo.NumberOfFrames));
for i = 1 : handles.videoInfo.NumberOfFrames
    waitfor(handles.pushbuttonPause,'tag','pushbuttonPause');
    I = imread(fullfile(pwd, sprintf('%s_images\\%04d.jpg', name, i)));
    try
        imshow(I, [], 'Parent', handles.axesVideo);
        set(handles.sliderVideoPlay, 'Value', i);
        set(handles.editSlider, 'String', sprintf('%d/%d', i, handles.videoInfo.NumberOfFrames));
    catch
        return;
    end
    drawnow;
end
set(handles.pushbuttonPause, 'Enable', 'Off');

% --- Executes on button press in pushbuttonOpenVideoFile.
function pushbuttonOpenVideoFile_Callback(hObject, eventdata, handles)
% hObject    handle to pushbuttonOpenVideoFile (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
% 打开视频文件按钮
videoFilePath = OpenVideoFile();
if videoFilePath == 0
    return;
end
set(handles.edit_videowidth, 'String', '');
set(handles.editVideoFilePath, 'String', videoFilePath);
msgbox('打开视频文件成功！', '提示信息');
handles.videoFilePath = videoFilePath;
guidata(hObject, handles);


% --- Executes on button press in pushbuttonkemspgz.
function pushbuttonkemspgz_Callback(hObject, eventdata, handles)
% hObject    handle to pushbuttonkemspgz (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
videoFilePath = handles.videoFilePath;
if videoFilePath == 0
    return;
end
% [Xpoints1, Ypoints1, Xpoints2, Ypoints2, tms, yc] = ProcessVideo(videoFilePath);
load tmp.mat
handles.pts = {[Ypoints1' Xpoints1'], [Ypoints2' Xpoints2']};
handles.tms = tms;
handles.yc = yc;

% Update handles structure
guidata(hObject, handles);
msgbox('定位成功！', '提示信息');

% --- Executes on button press in pushbuttonImageList.
function pushbuttonImageList_Callback(hObject, eventdata, handles)
% hObject    handle to pushbuttonImageList (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
% 获取图像序列按钮
if isequal(handles.videoFilePath, 0) || isequal(handles.videoInfo, 0)
    msgbox('请先获取视频信息', '提示信息');
    return;
end
Video2Images(handles.videoFilePath);
% Update handles structure
guidata(hObject, handles);
msgbox('获取图像序列成功！', '提示信息');

% --- Executes on button press in pushbuttonStopCheck.
function pushbuttonStopCheck_Callback(hObject, eventdata, handles)
% hObject    handle to pushbuttonStopCheck (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
% 视频分析
if isequal(handles.pts, 0)
    msgbox('请先获取定位信息', '提示信息');
    return;
end
pts = handles.pts;
pts1 = pts{1}; pts2 = pts{2};
[pathstr, name, ext] = fileparts(handles.videoFilePath);
set(handles.pushbuttonPause, 'Enable', 'On');
set(handles.pushbuttonPause, 'tag', 'pushbuttonPause', 'String', '暂停');
set(handles.sliderVideoPlay, 'Max', handles.videoInfo.NumberOfFrames, 'Min', 0, 'Value', 1);
set(handles.editSlider, 'String', sprintf('%d/%d', 0, handles.videoInfo.NumberOfFrames));

for i = 1 : min(handles.videoInfo.NumberOfFrames, size(pts1, 1))
    waitfor(handles.pushbuttonPause,'tag','pushbuttonPause');
    I = imread(fullfile(pwd, sprintf('%s_images\\%04d.jpg', name, i)));
    imshow(I, [], 'Parent', handles.axesVideo);
    set(handles.sliderVideoPlay, 'Value', i);
    set(handles.editSlider, 'String', sprintf('%d/%d', i, handles.videoInfo.NumberOfFrames));
    axes(handles.axesVideo); hold on;
    plot(pts1(i, 1), pts1(i, 2), 'go-', 'MarkerFaceColor', 'g');
    plot(pts2(i, 1), pts2(i, 2), 'bo-', 'MarkerFaceColor', 'b');
    hold off;
    drawnow;
end
set(handles.pushbuttonPause, 'Enable', 'Off');

% --- Executes on button press in pushbuttonPause.
function pushbuttonPause_Callback(hObject, eventdata, handles)
% hObject    handle to pushbuttonPause (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
str = get(handles.pushbuttonPause, 'tag');

if strcmp(str, 'pushbuttonPause') == 1
    set(handles.pushbuttonPause, 'tag', 'pushbuttonContinue', 'String', '继续');
    pause on;
else
    set(handles.pushbuttonPause, 'tag', 'pushbuttonPause', 'String', '暂停');
    pause off;
end

% --- Executes on button press in pushbuttonStop.
function pushbuttonStop_Callback(hObject, eventdata, handles)
% hObject    handle to pushbuttonStop (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
% 停止按钮
axes(handles.axesVideo); cla; axis on; box on;
set(gca, 'XTick', [], 'YTick', [], ...
    'XTickLabel', '', 'YTickLabel', '', 'Color', [0.7020 0.7804 1.0000]);
set(handles.editSlider, 'String', '0/0');
set(handles.sliderVideoPlay, 'Value', 0);
set(handles.pushbuttonPause, 'tag', 'pushbuttonContinue', 'String', '继续');
set(handles.pushbuttonPause, 'Enable', 'Off');
set(handles.pushbuttonPause, 'String', '暂停');


function editFrameNum_Callback(hObject, eventdata, handles)
% hObject    handle to editFrameNum (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: get(hObject,'String') returns contents of editFrameNum as text
%        str2double(get(hObject,'String')) returns contents of editFrameNum as a double


% --- Executes during object creation, after setting all properties.
function editFrameNum_CreateFcn(hObject, eventdata, handles)
% hObject    handle to editFrameNum (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: edit controls usually have a white background on Windows.
%       See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end



function editFrameWidth_Callback(hObject, eventdata, handles)
% hObject    handle to editFrameWidth (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: get(hObject,'String') returns contents of editFrameWidth as text
%        str2double(get(hObject,'String')) returns contents of editFrameWidth as a double


% --- Executes during object creation, after setting all properties.
function editFrameWidth_CreateFcn(hObject, eventdata, handles)
% hObject    handle to editFrameWidth (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: edit controls usually have a white background on Windows.
%       See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end



function editFrameHeight_Callback(hObject, eventdata, handles)
% hObject    handle to editFrameHeight (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: get(hObject,'String') returns contents of editFrameHeight as text
%        str2double(get(hObject,'String')) returns contents of editFrameHeight as a double


% --- Executes during object creation, after setting all properties.
function editFrameHeight_CreateFcn(hObject, eventdata, handles)
% hObject    handle to editFrameHeight (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: edit controls usually have a white background on Windows.
%       See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end



function editFrameRate_Callback(hObject, eventdata, handles)
% hObject    handle to editFrameRate (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: get(hObject,'String') returns contents of editFrameRate as text
%        str2double(get(hObject,'String')) returns contents of editFrameRate as a double


% --- Executes during object creation, after setting all properties.
function editFrameRate_CreateFcn(hObject, eventdata, handles)
% hObject    handle to editFrameRate (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: edit controls usually have a white background on Windows.
%       See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end



function editVideoFilePath_Callback(hObject, eventdata, handles)
% hObject    handle to editVideoFilePath (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: get(hObject,'String') returns contents of editVideoFilePath as text
%        str2double(get(hObject,'String')) returns contents of editVideoFilePath as a double


% --- Executes during object creation, after setting all properties.
function editVideoFilePath_CreateFcn(hObject, eventdata, handles)
% hObject    handle to editVideoFilePath (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: edit controls usually have a white background on Windows.
%       See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end


% --- Executes on button press in pushbuttonGetVideoInfo.
function pushbuttonGetVideoInfo_Callback(hObject, eventdata, handles)
% hObject    handle to pushbuttonGetVideoInfo (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
% 获取视频信息按钮
if handles.videoFilePath == 0
    msgbox('请载入视频文件！', '提示信息');
    return;
end
videoInfo = VideoReader(handles.videoFilePath);
handles.videoInfo = videoInfo;
guidata(hObject, handles);
set(handles.editFrameNum, 'String', sprintf('%d', videoInfo.NumberOfFrames));
set(handles.editFrameWidth, 'String', sprintf('%d px', videoInfo.Width));
set(handles.editFrameHeight, 'String', sprintf('%d px', videoInfo.Height));
set(handles.editFrameRate, 'String', sprintf('%.1f f/s', videoInfo.FrameRate));
set(handles.editDuration, 'String', sprintf('%.1f s', videoInfo.Duration));
set(handles.editVideoFormat, 'String', sprintf('%s', videoInfo.VideoFormat));
temp = read(videoInfo, 1);
imshow(temp, [], 'Parent', handles.axesVideo);
msgbox('获取视频文件信息成功！', '提示信息');


function editDuration_Callback(hObject, eventdata, handles)
% hObject    handle to editDuration (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: get(hObject,'String') returns contents of editDuration as text
%        str2double(get(hObject,'String')) returns contents of editDuration as a double


% --- Executes during object creation, after setting all properties.
function editDuration_CreateFcn(hObject, eventdata, handles)
% hObject    handle to editDuration (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: edit controls usually have a white background on Windows.
%       See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end



function editVideoFormat_Callback(hObject, eventdata, handles)
% hObject    handle to editVideoFormat (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: get(hObject,'String') returns contents of editVideoFormat as text
%        str2double(get(hObject,'String')) returns contents of editVideoFormat as a double


% --- Executes during object creation, after setting all properties.
function editVideoFormat_CreateFcn(hObject, eventdata, handles)
% hObject    handle to editVideoFormat (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: edit controls usually have a white background on Windows.
%       See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end


% --- Executes on button press in pushbuttonSnap.
function pushbuttonSnap_Callback(hObject, eventdata, handles)
% hObject    handle to pushbuttonSnap (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
% 抓图按钮响应函数
SnapImage();

% --- Executes on slider movement.
function sliderVideoPlay_Callback(hObject, eventdata, handles)
% hObject    handle to sliderVideoPlay (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: get(hObject,'Value') returns position of slider
%        get(hObject,'Min') and get(hObject,'Max') to determine range of slider


% --- Executes during object creation, after setting all properties.
function sliderVideoPlay_CreateFcn(hObject, eventdata, handles)
% hObject    handle to sliderVideoPlay (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: slider controls usually have a light gray background.
if isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor',[.9 .9 .9]);
end



function editSlider_Callback(hObject, eventdata, handles)
% hObject    handle to editSlider (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: get(hObject,'String') returns contents of editSlider as text
%        str2double(get(hObject,'String')) returns contents of editSlider as a double


% --- Executes during object creation, after setting all properties.
function editSlider_CreateFcn(hObject, eventdata, handles)
% hObject    handle to editSlider (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: edit controls usually have a white background on Windows.
%       See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end



function editInfo_Callback(hObject, eventdata, handles)
% hObject    handle to editInfo (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: get(hObject,'String') returns contents of editInfo as text
%        str2double(get(hObject,'String')) returns contents of editInfo as a double


% --- Executes during object creation, after setting all properties.
function editInfo_CreateFcn(hObject, eventdata, handles)
% hObject    handle to editInfo (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: edit controls usually have a white background on Windows.
%       See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end



function edit11_Callback(hObject, eventdata, handles)
% hObject    handle to edit11 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: get(hObject,'String') returns contents of edit11 as text
%        str2double(get(hObject,'String')) returns contents of edit11 as a double


% --- Executes during object creation, after setting all properties.
function edit11_CreateFcn(hObject, eventdata, handles)
% hObject    handle to edit11 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: edit controls usually have a white background on Windows.
%       See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end


% --- Executes on button press in pushbuttonExit.
function pushbuttonExit_Callback(hObject, eventdata, handles)
% hObject    handle to pushbuttonExit (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
% 退出系统按钮
choice = questdlg('确定要退出系统?', ...
    '退出', ...
    '确定','取消','取消');
switch choice
    case '确定'
        close;
    case '取消'
        return;
end


% --------------------------------------------------------------------
function File_Callback(hObject, eventdata, handles)
% hObject    handle to File (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)


% --------------------------------------------------------------------
function Exist_Callback(hObject, eventdata, handles)
% hObject    handle to Exist (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
% 退出菜单
choice = questdlg('确定要退出系统?', ...
    '退出', ...
    '确定','取消','取消');
switch choice
    case '确定'
        close;
    case '取消'
        return;
end

% --------------------------------------------------------------------
function About_Callback(hObject, eventdata, handles)
% hObject    handle to About (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
str = '视频处理系统V1.0';
msgbox(str, '提示信息');



function edit_videowidth_Callback(hObject, eventdata, handles)
% hObject    handle to edit_videowidth (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: get(hObject,'String') returns contents of edit_videowidth as text
%        str2double(get(hObject,'String')) returns contents of edit_videowidth as a double


% --- Executes during object creation, after setting all properties.
function edit_videowidth_CreateFcn(hObject, eventdata, handles)
% hObject    handle to edit_videowidth (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: edit controls usually have a white background on Windows.
%       See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end


% --- Executes on button press in pushbutton_compute.
function pushbutton_compute_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton_compute (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
% 计算
set(handles.edit_videowidth, 'String', sprintf('%.3f s', handles.tms/handles.videoInfo.NumberOfFrames));


% --- Executes on button press in pushbutton15.
function pushbutton15_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton15 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
if isequal(handles.pts, 0)
    msgbox('请先获取定位信息', '提示信息');
    return;
end
pts = handles.pts;
yc = handles.yc;
pts1 = pts{1}; pts2 = pts{2};
[ptsr1, ptsr2] = GetRealLocation();
t = 1 : min(handles.videoInfo.NumberOfFrames, size(pts1, 1));
xt1 = spline(t, pts1(:, 1), t);
yt1 = spline(t, pts1(:, 2), t);
xt2 = spline(t, pts2(:, 1), t);
yt2 = spline(t, pts2(:, 2), t);
axis(handles.axesVideo); cla; axis ij;
hold on;
h1 = plot(pts1(:, 1), pts1(:, 2), 'b.-');
h2 = plot(pts2(:, 1), pts2(:, 2), 'b.-');
h3 = plot(ptsr1(:, 1), ptsr1(:, 2), 'mo-');
h4 = plot(ptsr2(:, 1), ptsr2(:, 2), 'mo-');
h5 = plot(yc.Ypointst1, yc.Xpointst1, 'c+-');
h6 = plot(yc.Ypointst2, yc.Xpointst2, 'c+-');
legend([h1 h3 h5], {'测量值', '实际值', '预测值'}, 'Location', 'Best');
hold off;


% --- Executes on button press in pushbutton16.
function pushbutton16_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton16 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
if isequal(handles.pts, 0)
    msgbox('请先获取定位信息', '提示信息');
    return;
end
pts = handles.pts;
pts1 = pts{1}; pts2 = pts{2};
[ptsr1, ptsr2] = GetRealLocation();
t = 1 : length(pts1(:, 1));
xt1 = spline(t, pts1(:, 1), t);
yt1 = spline(t, pts1(:, 2), t);
xt2 = spline(t, pts2(:, 1), t);
yt2 = spline(t, pts2(:, 2), t);
v1 = diff(yt1)./diff(xt1); v1 = mat2gray(v1);
v2 = diff(yt2)./diff(xt2); v2 = mat2gray(v2);
axis(handles.axesVideo); cla reset; axis off; box on;
hold on;
plot(1:length(v1), v1, 'r-', 1:length(v2), v2, 'g-');
legend({'速度曲线1', '速度曲线2'}, 'Location', 'Best');
hold off;