/*?--稀疏光流示例程序--
*?Written?by?David?Stavens?（david.stavens@ai.stanford.edu）
*/
#include?
#include?
#include?
#include?

static?const?double?pi?=?3.14159265358979323846;

inline?static?double?square（int?a）
{
????return?a?*?a;
}

/*?This?is?just?an?inline?that?allocates?images.??I?did?this?to?reduce?clutter?in?the
*?actual?computer?vision?algorithmic?code.??Basically?it?allocates?the?requested?image
*?unless?that?image?is?already?non-NULL.??It?always?leaves?a?non-NULL?image?as-is?even
*?if?that?image‘s?size?depth?and/or?channels?are?different?than?the?request.
*/
inline?static?void?allocateOnDemand（IplImage?**img?CvSize?size?int?depth?int?channels）
{
????if?（*img?!=?NULL）	return;

????*img?=?cvCreateImage（size?depth?channels）;
????if?（*img?==?NULL）
????{
????????fprintf（stderr?“Error:?Couldn‘t?allocate?image.??Out?of?memory?\n“）;
????????exit（-1）;
????}
}

int?main（void）
{
????/*?Create?an?object?that?decodes?the?input?video?stream.?*/
????CvCapture?*input_video?=?cvCaptureFromFile（
????????“C://Users//caigaojian//Desktop//桌面//view//avi.avi“
????????）;
????if?（input_video?==?NULL）
????{
????????/*?Either?the?video?didn‘t?exist?OR?it?uses?a?codec?OpenCV
????????*?doesn‘t?support.
????????*/
????????fprintf（stderr?“Error:?Can‘t?open?video.\n“）;
????????return?-1;
????}

????/*?Read?the?video‘s?frame?size?out?of?the?AVI.?*/
????CvSize?frame_size;
????frame_size.height?=
????????（int）cvGetCaptureProperty（input_video?CV_CAP_PROP_frame_HEIGHT）;
????frame_size.width?=
????????（int）cvGetCaptureProperty（input_video?CV_CAP_PROP_frame_WIDTH）;

????/*?Determine?the?number?of?frames?in?the?AVI.?*/
????long?number_of_frames;
????/*?Go?to?the?end?of?the?AVI?（ie:?the?fraction?is?“1“）?*/
????cvSetCaptureProperty（input_video?CV_CAP_PROP_POS_AVI_RATIO?1.）;
????/*?Now?that?we‘re?at?the?end?read?the?AVI?position?in?frames?*/
????number_of_frames?=?（int）cvGetCaptureProperty（input_video?CV_CAP_PROP_POS_frameS）;
????/*?Return?to?the?beginning?*/
????cvSetCaptureProperty（input_video?CV_CAP_PROP_POS_frameS?0.）;

????/*?Create?a?windows?called?“Optical?Flow“?for?visualizing?the?output.
????*?Have?the?window?automatically?change?its?size?to?match?the?output.
????*/
????cvNamedWindow（“Optical?Flow“?CV_WINDOW_AUTOSIZE）;

????long?current_frame?=?0;
????while?（true）
????{
????????static?IplImage?*frame?=?NULL?*frame1?=?NULL?*frame1_1C?=?NULL?*frame2_1C?=?NULL?*eig_image?=?NULL?*temp_image?=?NULL?*pyramid1?=?NULL?*pyramid2?=?NULL;

????????/*?Go?to?the?frame?we?want.??Important?if?multiple?frames?are?queried?in
????????*?the?loop?which?they?of?course?are?for?optical?flow.??Note?that?the?very
????????*?first?call?to?this?is?actually?not?needed.?（Because?the?correct?position
????????*?is?set?outsite?the?for（）?loop.）
????????*/
????????cvSetCaptureProperty（input_video?CV_CAP_PROP_POS_frameS?current_frame）;

????????/*?Get?the?next?frame?of?the?v

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件??????69632??2016-07-21?10:26??optical_flow\bin\20160721stavens.exe

?????文件?????431056??2016-07-21?10:26??optical_flow\bin\20160721stavens.ilk

?????文件????1133568??2016-07-21?10:26??optical_flow\bin\20160721stavens.pdb

?????文件????????184??2016-07-21?10:58??optical_flow\bin\說明.txt

?????文件??????13100??2016-07-21?10:38??optical_flow\main.cpp

?????文件???13974216??2016-07-21?10:39??optical_flow\opcv.rar

?????文件????2160607??2009-12-25?14:57??optical_flow\stavens_opencv_optical_flow.pdf

?????文件????????412??2016-07-21?11:00??optical_flow\說明.txt

?????目錄??????????0??2016-07-21?10:54??optical_flow\bin

?????目錄??????????0??2016-07-21?10:51??optical_flow

-----------?---------??----------?-----??----

?????????????17782775????????????????????10