Question

我使用此代码检测动作并使用系统时间保存图片名称，如2013-11-26_01：20，但每秒只能有1张图片。我想拍多张照片，如2013-11-26_01：20-1,2013-11-26_01：20-2 ... 2013-11-26_01：21-1,2013-11-26_01：22-2。

bool saveImg(Mat image, const string DIRECTORY, const string EXTENSION, const char * DIR_FORMAT, const char * FILE_FORMAT){

stringstream ss;
time_t seconds;
struct tm * timeinfo;
char TIME[80];

time (&seconds);
timeinfo = localtime (&seconds);

// convert dir...
strftime (TIME,80,DIR_FORMAT,timeinfo);
ss.str("");
ss << DIRECTORY << TIME;

if(!directoryExists(ss.str().c_str()))
    mkdir(ss.str().c_str(), 0777);

// convert image name
strftime (TIME,80,FILE_FORMAT,timeinfo);
ss.str("");
ss << DIRECTORY << TIME << EXTENSION;

// save image
return imwrite(ss.str().c_str(), image);
}

int main (int argc, char * const argv[]) {

// const
const string DIR = "/home/balice/Desktop/";
const string EXT = ".jpg";
const int DELAY = 100; // mseconds

string DIR_FORMAT = "%d-%m-%Y";
string FILE_FORMAT = DIR_FORMAT + "/" + "%d-%m-%Y_%H:%M:%S";

// create all necessary instances
CvCapture * camera = cvCaptureFromCAM(CV_CAP_ANY);
Mat original =  cvQueryFrame(camera);
Mat next_frame = original;
Mat current_frame = cvQueryFrame(camera);
Mat prev_frame = cvQueryFrame(camera);

cvtColor(current_frame, current_frame, CV_RGB2GRAY);
cvtColor(prev_frame, prev_frame, CV_RGB2GRAY);
cvtColor(next_frame, next_frame, CV_RGB2GRAY);

Mat d1, d2, result;
int window = 200;
bool movement;
while (true){     
    movement = false;
    absdiff(next_frame, current_frame, d1);
    absdiff(current_frame, prev_frame, d2);
    bitwise_xor(d1, d2, result);

    int middle_y = result.rows/2;
    int middle_x = result.cols/2;

    // Center window
    threshold(result, result, 140, 255, CV_THRESH_BINARY);
    for(int i = middle_x-window; i < middle_x+window; i++)
        for(int j = middle_y-window; j < middle_y+window; j++)
            if(result.at<int>(j,i)>0)
            {
                movement = true;
                break;
            }

    if(movement==true)
        saveImg(original,DIR,EXT,DIR_FORMAT.c_str(),FILE_FORMAT.c_str());

    imshow("Motion", result);

    prev_frame = current_frame;
    current_frame = next_frame;

    // get image from webcam
    next_frame = cvQueryFrame(camera);
    cvtColor(next_frame, next_frame, CV_RGB2GRAY);
        break;
    }    
return 0;
}

Answer 1

您的问题是文件名限制。在同一秒拍摄的所有图像都具有相同的文件名。作为解决方案，我可以建议使用毫秒，或者在图像写入磁盘后添加一些计数器递增，并重新设置每一秒。您需要将此计数器值添加到filename。

每秒捕获多张图片，并命名使用时间和帧编号

1 个答案: