应用背景
使用该代码可以对图像进行特征提取。例如提取卫星图像中街道里的斑马线。还可以对闪电图像中电流路径进行提取，获得图像中电流的运动路径。
关键技术
visual studio
首先使用cmake将代码转换成visual studio项目， 转换过程中会提示安装一些必须软件如boost，shapelib，wxwidegets等等。
linux
qtcreator下使用g++
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.002170s ]
SELECT `a`.`aid`,`a`.`title`,`a`.`create_time`,`m`.`username` FROM `jrk_downrecords` `a` INNER JOIN `jrk_member` `m` ON `a`.`uid`=`m`.`id` WHERE `a`.`status` = 1 GROUP BY `a`.`aid` ORDER BY `a`.`create_time` DESC LIMIT 10 [ RunTime:0.086634s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.002342s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001957s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.002281s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003997s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001994s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003611s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.014960s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.003336s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 220328 [ RunTime:0.001267s ]
