matlab检测红绿灯及红绿灯持续时间代码
时间: 2023-09-29 10:11:29 浏览: 43
以下是一个基于Matlab的红绿灯检测及红绿灯持续时间测量的示例代码:
```matlab
% 读取视频文件
video = VideoReader('traffic_light.mp4');
% 初始化参数
frame_count = 0;
red_light_count = 0;
green_light_count = 0;
last_light = 'none';
last_change_frame = 0;
red_light_duration = 0;
green_light_duration = 0;
% 逐帧处理
while hasFrame(video)
frame_count = frame_count + 1;
img = readFrame(video);
gray_img = rgb2gray(img);
blur_img = imgaussfilt(gray_img, 3);
bw_img = imbinarize(blur_img, 0.5);
[centers, radii, metric] = imfindcircles(bw_img, [20 40], 'ObjectPolarity', 'bright', 'Sensitivity', 0.9);
for i = 1:length(radii)
if centers(i, 2) < size(img, 1)/2
crop_img = imcrop(img, [centers(i,1)-radii(i) centers(i,2)-radii(i) 2*radii(i) 2*radii(i)]);
hsv_img = rgb2hsv(crop_img);
hue = hsv_img(:,:,1);
saturation = hsv_img(:,:,2);
value = hsv_img(:,:,3);
red_mask = hue < 0.1 | hue > 0.9;
green_mask = hue > 0.3 & hue < 0.5;
red_count = sum(sum(red_mask & saturation > 0.5 & value > 0.5));
green_count = sum(sum(green_mask & saturation > 0.5 & value > 0.5));
if red_count > green_count
current_light = 'red';
else
current_light = 'green';
end
if strcmp(current_light, last_light)
continue;
end
if strcmp(current_light, 'red')
red_light_count = red_light_count + 1;
if last_light == 'green'
green_light_duration = frame_count - last_change_frame;
end
last_change_frame = frame_count;
else
green_light_count = green_light_count + 1;
if last_light == 'red'
red_light_duration = frame_count - last_change_frame;
end
last_change_frame = frame_count;
end
last_light = current_light;
end
end
end
% 输出结果
total_frames = video.NumFrames;
red_light_duration = red_light_duration / video.FrameRate;
green_light_duration = green_light_duration / video.FrameRate;
fprintf('Total frames: %d\n', total_frames);
fprintf('Red light count: %d\n', red_light_count);
fprintf('Green light count: %d\n', green_light_count);
fprintf('Red light duration: %.2f seconds\n', red_light_duration);
fprintf('Green light duration: %.2f seconds\n', green_light_duration);
```
该程序通过逐帧读取视频文件,使用与上面相同的方法来检测红绿灯,并根据红绿灯的颜色和位置来测量红绿灯的持续时间。程序输出视频文件的总帧数、红绿灯切换次数、红绿灯持续时间等信息。该程序仅供参考,具体实现需要根据实际情况进行调整和优化。