环境一览：WINXP SP3+DX9.0C+VC6.0 SP6+IPP5.3.2.073+DX9.0bSDK
环境变量设置：
set OPENCV=E:\Program Files\OpenCV\
set include=%include%;%OPENCV%\CXCORE\INCLUDE;%OPENCV%\CV\INCLUDE;%OPENCV%\CVAUX\INCLUDE;%OPENCV%\ML\INCLUDE;%OPENCV%\OTHERLIBS\HIGHGUI;%OPENCV\OTHERLIBS\_GRAPHICS
\INCLUDE
set lib=%lib%;%OPENCV%\LIB
对于VC IDE 在工具-选项-目录里面设置与以上相应的include和libs
参考书籍：
OReilly-LearningOpenCV
第二章例子更正：
example 1
cvLoadImage( argv[1],CV_LOAD_IMAGE_COLOR );
example 2
不是所有格式avi都能放，可安装XVID,或者K-lite codec pack
支持格式可参考http://opencv.willowgarage.com/wiki/VideoCodecs
mencoder in.avi -ovc raw -vf format=i420 -o out.avi
example 3
注释掉Hack代码
拖放使能：去注释cvGetCaptureProperty
不需要#include "cv.h"
example 4
图片不要放在Debug文件夹里
example 5
filter
cvPyrDown有第三个参数filter
example 10
cvCreateVideoWriter中CV_FOURCC改成你机子上支持的格式，否则不生成AVI
TO remember:
although it’s important to take care of garbage collection in OpenCV, we should only clean up the garbage that we have created.
另外example 9 应该是用的vfw，可用Directshow的实现
参考链接：
http://www.opencv.org.cn/index.php/%E4%BD%BF%E7%94%A8DirectShow%E9%87%87%E9%9B%86%E5%9B%BE%E5%83%8F
Code
1
第1章习题答案：
23-4
3
4
5#include "cv.h"
6#include "highgui.h"
7
8IplImage* doPyrDown(
9 IplImage* in,
10 int filter = IPL_GAUSSIAN_5x5)
11
{
12
13 // Best to make sure input image is divisible by two.
14 //
15 assert( in->width%2 == 0 && in->height%2 == 0 );
16
17 IplImage* out = cvCreateImage(
18 cvSize( in->width/2, in->height/2 ),
19 in->depth,
20 in->nChannels
21 );
22 cvPyrDown( in, out );
23 return( out );
24
};
25
26int main( int argc, char** argv ) {
27 cvNamedWindow( "MyApp", CV_WINDOW_AUTOSIZE );
28 cvNamedWindow( "Scale", CV_WINDOW_AUTOSIZE );
29 CvCapture* capture;
30
if (argc==1) {
31 capture = cvCreateCameraCapture( -1 );
32 } else {
33 capture = cvCreateFileCapture( argv[1] );
34
}
35 assert( capture != NULL );
36
37 IplImage* frame;
38
39 double fps = 25.0;
40
41 CvSize size = cvSize(
42 (int)cvGetCaptureProperty( capture, CV_CAP_PROP_FRAME_WIDTH),
43 (int)cvGetCaptureProperty( capture, CV_CAP_PROP_FRAME_HEIGHT)
44 );
45
46 IplImage* scaleimg = cvCreateImage( size, IPL_DEPTH_8U,
47 3);
48
49 CvVideoWriter* writer = cvCreateVideoWriter( // On linux Will only work if you've installed ffmpeg development files correctly,
50 "write.avi", // otherwise segmentation fault. Windows probably better.
51 CV_FOURCC('x','v','i','d'),
52 fps,
53 size
54 );
55
56 while(1) {
57
58
59 frame = cvQueryFrame( capture );
60 if( !frame ) break;
61 cvShowImage( "MyApp", frame );
62 scaleimg=doPyrDown(frame);
63 cvShowImage("Scale",scaleimg);
64 cvWriteToAVI( writer, scaleimg );
65
66 char c = cvWaitKey(10);
67 if( c == 27 ) break;
68 }
69 cvReleaseVideoWriter( &writer );
70
71 cvReleaseImage( &scaleimg );
72 cvReleaseCapture( &capture );
73 cvDestroyWindow( "MyApp" );
74 cvDestroyWindow("Scale");
75}
76
775
78
79#include <iostream>
80
81#include "cv.h"
82#include "highgui.h"
83/**//*
84OK, you caught us. Video playback under linux is still just bad. Part of this is due to FFMPEG, part of this
85is due to lack of standards in video files. But the position slider here will often not work. We tried to at least
86find number of frames using the "getAVIFrames" hack below. Terrible. But, this file shows something of how to
87put a slider up and play with it. Sorry.
88*/
89
90
91using namespace std;
92
93int g_slider_position = 0;
94CvCapture* g_capture = NULL;
95
96
97IplImage* doPyrDown(IplImage* in,
98 int filter = IPL_GAUSSIAN_5x5)
99{
100
101 // Best to make sure input image is divisible by two.
102 assert( in->width%2 == 0 && in->height%2 == 0 );
103
104 IplImage* out = cvCreateImage(
105 cvSize( in->width/2, in->height/2),
106 in->depth,
107 in->nChannels
108 );
109 cvPyrDown( in, out );
110 return( out );
111};
112
113void onTrackbarSlide(int pos) {
114 cvSetCaptureProperty(
115 g_capture,
116 CV_CAP_PROP_POS_FRAMES,
117 pos
118 );
119}
120
121int main( int argc, char** argv ) {
122 cvNamedWindow( "MyApp2", CV_WINDOW_AUTOSIZE );
123 cvNamedWindow( "Scale", CV_WINDOW_AUTOSIZE );
124 g_capture = cvCreateCameraCapture( 0 );
125 IplImage *foo = cvQueryFrame( g_capture);
126
127
128 int frames = 3;
129
130 int tmpw = (int) cvGetCaptureProperty(
131 g_capture,
132 CV_CAP_PROP_FRAME_WIDTH
133 );
134
135 int tmph = (int) cvGetCaptureProperty(
136 g_capture,
137 CV_CAP_PROP_FRAME_HEIGHT
138 );
139
140
141 cvCreateTrackbar(
142 "Position",
143 "MyApp2",
144 &g_slider_position,
145 frames,
146 onTrackbarSlide
147 );
148 IplImage* frame;
149 IplImage* img2 = cvCreateImage( cvSize(foo->width/2,foo->height/2), IPL_DEPTH_8U, 3);
150 while(1) {
151
152 frame = cvQueryFrame( g_capture );
153 if( !frame ) break;
154 //int frames = cvGetCaptureProperty( g_capture, CV_CAP_PROP_POS_FRAMES);//This should work, sometimes it does not on linux
155 switch (g_slider_position)
156 {
157 case 0:
158 img2=doPyrDown(frame);
159 break;
160 case 1:
161 img2=doPyrDown(frame);
162 img2=doPyrDown(img2);
163 break;
164 default:
165 img2=doPyrDown(frame);
166 img2=doPyrDown(img2);
167 img2=doPyrDown(img2);
168 break;
169 }
170
171
172 cvShowImage( "MyApp2", frame );
173 cvShowImage("Scale",img2);
174
175
176 char c = (char)cvWaitKey(10);
177 if( c == 27 ) break;
178 }
179 cvReleaseImage( &img2);
180 cvReleaseCapture( &g_capture );
181 cvDestroyWindow( "MyApp2" );
182 cvDestroyWindow( "Scale" );
183 return(0);
184}
185
186
