OpenCV/Patch to enable capturing frame rate setting on OpenCV 2.2

OpenCV/Patch to enable capturing frame rate setting on OpenCV 2.2 †

#multilang(ja){{

概要 †

OpenCV 2.2のDirectShow?によるキャプチャでフレームレート変更を有効にするパッチです．
※こちらで配布されているOpenCV-2.2.0-win.zipを対象としたパッチです．

ダウンロード †

Version	Filename	Size	Date	Type	Download
1.0	highgui_dshow_fps_patch_v1.zip	14.96 KB	20110702	zip

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変更履歴 †

Version	Date	変更内容
1.0	20110702	新規作成

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内容物 †

cap_dshow.cpp

DirectShowによるキャプチャでフレームレート変更を有効にするパッチ

precomp.hpp

OpenCV2.2のバグ修正（※DirectShowのキャプチャ利用に必要）

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使い方 †

上記リンクからhighgui_dshow_fps_patch_v1.zipをダウンロードして展開します．
展開したファイル（cap_dshow.cpp、precomp.hpp）を下記ディレクトリにコピーして下さい．
```
OpenCV-2.2.0\modules\highgui\src
```
CMakeでWITH_VIDEOINPUTを有効にしてビルドしてください．

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サンプルプログラム †

enable_fps_setting_dshow.cpp

#include "opencv2/core/core.hpp"
#include "opencv2/highgui/highgui.hpp"

/* ライブラリのリンク */
#pragma comment( lib, "opencv_core220.lib" )
#pragma comment( lib, "opencv_highgui220.lib" )

int main (int argc, char **argv)
{
    CvCapture *capture = NULL;
    IplImage  *frame   = NULL;
    double w   = 320; /* 幅 */
    double h   = 240; /* 高さ */
    double fps = 30;  /* フレームレート */
    int    c   = 0;

    /* DirectShowを使ったキャプチャ(CV_CAP_DSHOW)初期化 */
    capture = cvCreateCameraCapture(CV_CAP_DSHOW);
    if(capture == NULL)
    {
        fprintf(stderr, "[Error]Could not initialize capturing\n");
        return -1;
    }
    
    /* キャプチャサイズ（縦、横）の指定 */
    cvSetCaptureProperty(capture, CV_CAP_PROP_FRAME_WIDTH, w);
    cvSetCaptureProperty(capture, CV_CAP_PROP_FRAME_HEIGHT, h);

    /* フレームレートの指定 */
    cvSetCaptureProperty(capture, CV_CAP_PROP_FPS, fps);

    cvNamedWindow("Capture", CV_WINDOW_AUTOSIZE);

    while(1)
    {
        frame = cvQueryFrame(capture);
        cvShowImage("Capture", frame);
        c = cvWaitKey(1);
        if(c == '\x1b') break;
    }

    cvReleaseCapture(&capture);
    cvDestroyWindow("Capture");

    return 0;
}

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Contact †

間違い・御指摘等ありましたら，

までメールにてご連絡ください．

}}

#multilang(en){{

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Abstract

This page describes the way to enable capturing frame rate setting on OpenCV 2.2.
This patch is intended for OpenCV-2.2.0-win.zip in Official Release.

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Download

Version	Filename	Size	Date	Type	Download
1.0	highgui_dshow_fps_patch_v1.zip	14.96 KB	20110702	zip

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ChangeLog?

Version	Date	Changes
1.0	20110702	First Release

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Files

cap_dshow.cpp

This is patch to enable capturing frame rate setting.

precomp.hpp

This is OpenCV 2.2's bug fix patch. It is need to use capturing using DirectShow.

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Usage

Please download highgui_dshow_fps_patch_v1.zip. And,extract this file.
Please overwrite the patch's files to the following directory.
```
OpenCV-2.2.0\modules\highgui\src
```
Please enable WITH_VIDEOINPUT on CMake, and build OpenCV.

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Sample

enable_fps_setting_dshow_en.cpp

#include "opencv2/core/core.hpp"
#include "opencv2/highgui/highgui.hpp"

/* link library */
#pragma comment( lib, "opencv_core220.lib" )
#pragma comment( lib, "opencv_highgui220.lib" )

int main (int argc, char **argv)
{
    CvCapture *capture = NULL;
    IplImage  *frame   = NULL;
    double w   = 320; /* width of capturing */
    double h   = 240; /* height of capturing */
    double fps = 30;  /* framerate of capturing */
    int    c   = 0;

    /* Initialization of capturing using DirectShow(CV_CAP_DSHOW) */
    capture = cvCreateCameraCapture(CV_CAP_DSHOW);
    if(capture == NULL)
    {
        fprintf(stderr, "[Error]Could not initialize capturing\n");
        return -1;
    }
    
    /* setting size(width, height) of capturing */
    cvSetCaptureProperty(capture, CV_CAP_PROP_FRAME_WIDTH, w);
    cvSetCaptureProperty(capture, CV_CAP_PROP_FRAME_HEIGHT, h);

    /* setting framerate of capturing */
    cvSetCaptureProperty(capture, CV_CAP_PROP_FPS, fps);

    cvNamedWindow("Capture", CV_WINDOW_AUTOSIZE);

    while(1)
    {
        frame = cvQueryFrame(capture);
        cvShowImage("Capture", frame);
        c = cvWaitKey(1);
        if(c == '\x1b') break;
    }

    cvReleaseCapture(&capture);
    cvDestroyWindow("Capture");

    return 0;
}

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Contact

If you have question，please send e-mail to the following address.

}}