點解相機可以捕捉笑容??

相機可以捕捉笑容並自動進行拍照，要由 Face Dectection 技術說起，時下的數碼相機多具 Face Dectection 功能，有效調整焦距、暴光、閃光燈及色調等等。
『‧‧‧Fuji, Canon, Nikon, Pentax, and Samsung all had cameras available that could automatically identify faces in a composition, then adjust focus and exposure for them‧‧‧』
http://www.thedigitalstory.com/blog/2007/05/a_closer_look_at_fac.html

『‧‧‧with Face Detection Technology activated, will automatically focus on the person rather than trees in the background or objects in the foreground that may happen to fall in the center of the frame. Since the system is capable of evaluating and scoring up to 10 faces at once, it will automatically provide the best possible focus‧‧‧』
http://www.fujifilmusa.com/JSP/fuji/epartners/PRNewsDetail.jsp?DBID=NEWS_856318

『‧‧‧ Face Detection technology that recognizes up to 8 faces in a photo and automatically controls focus, exposure, color and flash to bring out the best in everyone. Unlike some competitive systems, Sony Face Detection makes skin tones look more natural and reduces red-eye with pre-strobe flash.』
http://www.sonystyle.com/webapp/wcs/stores/servlet/ProductDisplay?catalogId=10551&storeId=10151&productId=8198552921665200473&langId=-1

Face Dectection 技術主要透過分辨面部顏色和動態部份，眨動的眼睛，從而鎖定目標臉孔，因此其他動物和印在衣服臉也被排除。捕捉笑容其實只是 Face Dectection 技術的延伸，透過運算和比較目標臉孔的變化幅度或顏色比例的變化，如牙齒的白，口腔的黑，從而發出訊號，觸發快門，拍下照片。因此，扮鬼臉和一張哭臉也極可能觸發快門，所以相機自動拍了小朋友的哭臉也別奇怪。
『‧‧‧Face Detection system and intelligent Smile Shutter algorithm do the rest‧‧‧』
http://www.sonystyle.com/webapp/wcs/stores/servlet/ProductDisplay?catalogId=10551&storeId=10151&productId=8198552921665200473&langId=-1

Finding faces
http://www.facedetection.com/facedetection/techniques.htm

Face Tracking
http://www.cs.rutgers.edu/~decarlo/facetrack.html

Face Detection Demo
http://www.youtube.com/watch?v=4sVom7HtdyE


2007-09-21 10:29:05 補充：
Face Detection 和 Face Recognition 有少許分別，前者只要找出面孔；後者除找出面孔還要肯定身份，多作保安用途，即所謂 BioID。Face Recognition http://tash.gn.apc.org/face_rec.htmBioIDhttp://www.bioid.com

2007-09-21 10:38:57 補充：
早年的電子狗 AIBO 會追逐粉紅色的球，便是使用 Face Detection 技術，與追蹤一張臉無異；而它能夠分辨主人面孔則需要應用 Face Recognition 。http://www.robotoys.com/st_prod.html?p_prodid=1545

2007-09-21 10:44:43 補充：
由上文 『‧‧‧ Sony Face Detection makes skin tones look more natural and reduces red-eye with pre-strobe flash.』，可以推斷它是以面色和眼睛來追蹤臉孔的。

2007-09-21 16:30:59 補充：
此追蹤笑臉技術，她們稱為 smile-recognition shutter ，比較目標口部、眼睛和唇部的變化來決定是否笑臉。

2007-09-21 16:31:32 補充：
『‧‧‧ smile-recognition shutter function selected by the touch panel, you can pick which of up to eight people‧‧‧』http://today.reuters.com/news/articlenews.aspx?type=technologyNews&storyid=2007-09-14T153207Z_01_GOR445894_RTRUKOC_0_US-JAPAN-CAMERA-TECH.xml&src=nl_ustechnology

2007-09-21 16:31:58 補充：
『‧‧‧analyzes facial features (such as mouth and eye wrinkles or lip separation) to determine when a subject is smiling‧‧‧』http://www.portablegadget.com/digital-camera/you-better-say-cheese-or-else-sony-smile-shutter-cameras

thanks

Sony 用AI algorithm來寫呢個新program, 「Smile Shutter」，
佢可以分析人類面上的笑紋，然後自動拍照。

圖片參考：http://images.digitalcamerainfo.com/images/upload/Image/NEWS%20IMAGES/2007%20August%20News%20Photos/Sony-Smile-Shutter.jpg

其他動物的面上的線條可有不同，
如果要做到的話，需要更多的DATABASE與不同的algorithm組合。
現時，該program只可以 detect 3種level的笑容，
分別是
high -- (to detect a faint smile),
medium -- (for a normal smile), or
low -- (for a hearty laugh).

快d買番部SONY T200 或者係 T70 玩吓啦~~
重等乜嘢呀？﹗
圖片參考：http://hk.yimg.com/i/icon/16/1.gif


圖片參考：http://www.dpreview.com/news/0708/Sony/sonyt70t200_3q.jpg

其實部機個trick只在於用係一般face recognition既程式上, 加多少少野o者.
face recognition最常見應該會係用係回鄉證入中國境時果條特別自動通道.
大陸既e道同香港既唔同, 大陸既之前要幫你影張相,
之後過閘時多照一次去確認.
face recognition會將面分別幾個唔同既點去程式化,
所以好似眼, 嘴, 鼻等位置既相對位置會記低.
再做比對就得.
smile recognition 只要利用呢個原理,
量度嘴同眼既特徵, 咁當一笑既時候,
嘴角上升, 顴骨又會上升, 咁即係代表 "影得"
唔可以用係其他動物, 主因係頭骨既形狀完全唔夾,
咁度出黎既數可能會偏離左人類既常見數字而得出 "死物"既結論.
(如果唔係環境有變都可能引發快門, 咁就唔得掂)
而且.... 除左靈長目動物之外, 冇動物係識笑架.......
(表現開心就得, 有冇人見過狗會嘴角向上堯丫?)