kevin's profile - activity

Did you ever improve the performance?

Does the error have something to do with jpeg? Do you need to link to libjpeg maybe? I haven't really done any iOS programming, so not sure if that lib is already included.

I downloaded this version and it compiled and worked no problem on OSX 10.8.2.

This has been answered already here.

Take a look at how Kalman filters work and note there is a pre-state (a priori) and a post state (a posteriori). The post state is the estimate which is a combination of the pre-state and a residual multiplied by the Kalman gain.

Try the OpenCV 2 Cookbook ... there are some good examples in there.

Also, when you download the OpenCV source code, take a look at the camshiftdemo.cpp samples/cpp subfolder. That is a histogram example.

Unfortunately that book documents the old C way and not the newer 2.0.

Is your application real objects captured by a camera or synthetic circles like the example image?

You need to compile OpenCV with ffmpeg support. This works on OSX Lion with a D-Link camera.

#include <stdio.h>
#include <opencv2/opencv.hpp>
#include <iostream>

int main(int, char**) {
    cv::VideoCapture vcap;
    cv::Mat image;

    // This works on a D-Link CDS-932L
    const std::string videoStreamAddress = "http://<username:password>@<ip_address>/video.cgi?.mjpg";

    //open the video stream and make sure it's opened
    if(!vcap.open(videoStreamAddress)) {
        std::cout << "Error opening video stream or file" << std::endl;
        return -1;
    }

    for(;;) {
        if(!vcap.read(image)) {
            std::cout << "No frame" << std::endl;
            cv::waitKey();
        }
        cv::imshow("Output Window", image);
        if(cv::waitKey(1) >= 0) break;
    }   
}

How do I get the images off of an IP camera that streams motion jpegs (mjpeg)?