运用matlab获取振动视频中结构的位移时程曲线的代码？

以下一个简单的matlab代码，用于从振动视频中提取结构的位移时程曲线：

1. 读取视频文件并提取每一帧的图像：

videoFile = 'your_video_file_name.mp4';
vidObj = VideoReader(videoFile);
numFrames = vidObj.NumberOfFrames;

for i = 1:numFrames
    frames(i).data = read(vidObj,i);
end

2. 在每一帧图像中找到结构物体的轮廓：

for i = 1:numFrames
    % Convert to grayscale and apply edge detection
    grayImage = rgb2gray(frames(i).data);
    edgeImage = edge(grayImage,'Canny');
    
    % Find contours of the object
    [B,~] = bwboundaries(edgeImage,'noholes');
    
    % Choose the boundary with the largest area as the object
    area = cellfun(@numel,B);
    [~,maxIdx] = max(area);
    objectBoundary = B{maxIdx};
    
    % Save the object boundary coordinates
    frames(i).objectBoundary = objectBoundary;
end

3. 计算每一帧中结构物体的中心点坐标，然后计算位移时程曲线：

% Calculate the center of mass of the object in each frame
for i = 1:numFrames
    x = frames(i).objectBoundary(:,2);
    y = frames(i).objectBoundary(:,1);
    frames(i).objectCenter = [mean(x),mean(y)];
end

% Calculate the displacement time history
displacement = zeros(numFrames,1);
for i = 2:numFrames
    displacement(i) = norm(frames(i).objectCenter - frames(1).objectCenter);
end

% Plot the displacement time history
plot(displacement);
xlabel('Frame number');
ylabel('Displacement (pixels)');

请注意，这只是一个简单的代码示例，可能需要根据您的实际应用进行修改。