基于小波变换的静态图像数字水印matlab的实现最低有效位方法(LSB) ：这是一种典型的空间域数据隐藏算法，L. F. Tumer 与R. G. Van Schyadel等先后利用此方法将特定的标记隐藏于数字音频和数字图像内。该方法是利用原始数据的最低几位来隐藏信息。LSB 方法的优点是有较大的信息隐藏量，但采用此方法实现的数字水印是很脆弱的，无法经受一些无损和有损的信息处理，而且如果确切地知道水印隐藏在几位LSB中，数字水印很容易被擦除或绕过。
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001818s ]
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:0.124635s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001679s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.002044s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001504s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.004739s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001284s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.004258s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.019089s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.002088s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 339706 [ RunTime:0.001459s ]
