如何在 OpenCV 中设置相机 FPS?CV_CAP_PROP_FPS 是假的 [英] How to set camera FPS in OpenCV? CV_CAP_PROP_FPS is a fake

问题描述

如何设置相机帧率?

可能是cvSetCaptureProperty(cameraCapture, CV_CAP_PROP_FPS, 30);?

May be cvSetCaptureProperty(cameraCapture, CV_CAP_PROP_FPS, 30); ?

但它的回报HIGHGUI ERROR: V4L2: Unable to get property (5) - Invalid argument

But it's return HIGHGUI ERROR: V4L2: Unable to get property (5) - Invalid argument

因为highgui/cap_v4l.cpp中没有实现

Because there is no implementation in highgui/cap_v4l.cpp

static int icvSetPropertyCAM_V4L( CvCaptureCAM_V4L* capture,
                                  int property_id, double value ){
    static int width = 0, height = 0;
    int retval;

    /* initialization */
    retval = 0;

    /* two subsequent calls setting WIDTH and HEIGHT will change
       the video size */
    /* the first one will return an error, though. */

    switch (property_id) {
    case CV_CAP_PROP_FRAME_WIDTH:
        width = cvRound(value);
        if(width !=0 && height != 0) {
            retval = icvSetVideoSize( capture, width, height);
            width = height = 0;
        }
        break;
    case CV_CAP_PROP_FRAME_HEIGHT:
        height = cvRound(value);
        if(width !=0 && height != 0) {
            retval = icvSetVideoSize( capture, width, height);
            width = height = 0;
        }
        break;
    case CV_CAP_PROP_BRIGHTNESS:
    case CV_CAP_PROP_CONTRAST:
    case CV_CAP_PROP_SATURATION:
    case CV_CAP_PROP_HUE:
    case CV_CAP_PROP_GAIN:
    case CV_CAP_PROP_EXPOSURE:
        retval = icvSetControl(capture, property_id, value);
        break;
    default:
        fprintf(stderr,
                "HIGHGUI ERROR: V4L: setting property #%d is not supported
",
                property_id);
    }

    /* return the the status */
    return retval;
}

如何解决?

推荐答案

使用 opencv 的 python 包装器，我可以将变量引用为:

using the python wrappers for opencv, it worked for me to refer to the variable as:

cap = cv2.VideoCapture(1)
cap.set(cv2.cv.CV_CAP_PROP_FPS, 60)

我正在使用 python 2.7.3 和 opencv 2.4.8

I am using python 2.7.3 and opencv 2.4.8

相机是 PS3 Eye

The camera is the PS3 Eye

这篇关于如何在 OpenCV 中设置相机 FPS?CV_CAP_PROP_FPS 是假的的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！