SIFT
鐗瑰緛鐐瑰尮閰嶇畻娉?/p>
鍩轰簬
SIFT
鏂规硶鐨勫浘鍍忕壒寰佸尮閰嶅彲鍒嗕负鐗瑰緛鎻愬彇鍜岀壒寰佸尮閰嶄袱涓儴鍒嗭紝
鍙粏鍖栧垎涓轰簲涓儴鍒嗭細
鈶?/p>
灏哄害绌洪棿鏋佸�兼娴嬶紙
Scale-space extrema detection
锛?/p>
锛?/p>
鈶?/p>
绮剧‘鍏抽敭鐐瑰畾浣嶏紙
Keypoint localization
锛?/p>
鈶?/p>
鍏抽敭鐐逛富鏂瑰悜鍒嗛厤锛?/p>
Orientation assignment
锛?/p>
鈶?/p>
鍏抽敭鐐规弿杩板瓙鐢熸垚锛?/p>
Keypoint descriptor generation
锛?/p>
鈶?/p>
姣?/p>
杈?/p>
鎻?/p>
杩?/p>
瀛?/p>
闂?/p>
娆?/p>
姘?/p>
璺?/p>
绂?/p>
杩?/p>
琛?/p>
鍖?/p>
閰?/p>
锛?/p>
Comparing
the
Euclidean
distance
of
the
descriptors for matching
锛?/p>
1.1
灏哄害绌洪棿鏋佸�兼娴?/p>
鐗瑰緛鍏抽敭鐐圭殑鎬ц川涔嬩竴灏辨槸瀵逛簬灏哄害鐨勫彉鍖栦繚鎸佷笉鍙樻�?/p>
銆傚洜姝ゆ垜浠墍瑕佸鎵剧殑鐗瑰緛鐐?/p>
蹇呴』鍏峰鐨勬�ц川涔嬩竴锛?/p>
灏辨槸鍦ㄤ笉鍚屽昂搴︿笅閮借兘琚娴嬪嚭鏉ャ�?/p>
瑕佽揪鍒拌繖涓洰鐨勶紝
鎴戜滑鍙互鍦ㄥ昂
搴︾┖闂村唴瀵绘壘鏌愮绋冲畾涓嶅彉鐨勭壒鎬с�?/p>
Koenderink
鍜?/p>
Lindeberg
宸茬粡璇佹槑锛屽彉鎹㈠埌灏哄害绌洪棿鍞竴鐨勬牳鍑芥暟鏄珮鏂嚱鏁般�傚洜姝?/p>
涓�涓浘鍍忕殑灏哄害绌洪棿瀹氫箟涓猴細
(
,
,
)
L
x
y
飦?/p>
锛屾槸鐢卞彲鍙樺昂搴︾殑楂樻柉鍑芥暟
(
,
,
)
G
x
y
飦?/p>
涓庤緭鍏ュ浘鍍?
(
,
)
I
x
y
鍗风Н寰楀埌锛屽嵆锛?/p>
)
,
(
)
,
,
(
)
,
,
(
y
x
I
y
x
G
y
x
L
飥?/p>
飥?/p>
飦?/p>
飦?/p>
锛?/p>
1.1
锛?/p>
鍏朵腑锛?/p>
2
2
2
2
/
)
(
2
2
1
)
,
,
(
飦?/p>
飦帮伋
飦?/p>
y
x
e
y
x
G
飥?/p>
飥?/p>
飥?
鍦ㄥ疄闄呭簲鐢ㄤ腑锛屼负浜嗚兘鐩稿楂樻晥鍦拌绠楀嚭鍏抽敭鐐圭殑浣嶇疆锛屽缓璁娇鐢ㄧ殑鏄?/p>
宸垎楂樻柉
鍑芥暟
锛?/p>
difference of Gaussian
锛?/p>
(
,
,
)
D
x
y
飦?/p>
銆傚叾瀹氫箟濡備笅锛?/p>
)
,
,
(
)
,
,
(
)
,
(
))
,
,
(
)
,
,
(
(
)
,
,
(
飦?/p>
飦?/p>
飦?/p>
飦?/p>
飦?/p>
y
x
L
k
y
x
L
y
x
I
y
x
G
k
y
x
G
y
x
D
飥?/p>
飥?/p>
飥?/p>
飥?/p>
飥?/p>
锛?/p>
1.2
锛?/p>
濡備笂寮忥紝
D
鍗虫槸涓や釜鐩搁偦鐨勫昂搴︾殑宸紙涓や釜鐩搁偦鐨勫昂搴﹀湪灏哄害涓婄浉宸竴涓浉涔樼郴鏁?/p>
k
锛?/p>
銆?/p>