matlab运行SIFT算法总是出现未定义函数变量？

ubeautqq

未定义函数或变量 "pt11"。

出错 features_matching (line 14)
[B1,IX] = sort(pt11(:,1));

出错 tuxiangpingjie (line 34)
[pt1,pt2]= features_matching( db, desc2, dist_ratio , pos1 , pos2);

features_matching 程序
function [pt1,pt2] = features_matching( database, desc, dist_ratio , pos1 , pos2 )
num = 1;
/ N& m$ ~% t5 v; X1 q- u- T! afor k = 1:size(desc,1)
dist = sqrt(sum((database.desc - repmat(desc(k,,size(database.desc,1),1)).^2,2));
, r3 _, Y8 ^/ H/ K8 ~# q- E[B,IX] = sort(dist);
if B(1)/B(2) >= dist_ratio %nn2_dist >= dist_ratio
1 F% ^' I1 a7 t% cidx = 0;
0 E( b0 W5 a$ g- N# A3 Celse
+ w( K- _5 M; |pt22(num, = pos2(k,;
( _0 Q3 l8 P; gpt11(num,:) = pos1(IX(1),:);
! F# ~7 m4 T. d7 x0 t/ [num = num + 1;
, N+ I0 S9 k1 E) Z+ j. }end
end
9 w+ K8 f8 Z5 m# F; p! x- w6 p[B1,IX] = sort(pt11(:,1));
Pt1 = pt11(IX,:);
9 f4 x" x) K9 C" {Pt2 = pt22(IX,:);

; q3 H+ l( B; D6 Hk = 1;
* |# B& T5 v; G: Sfor i = 2:num-1
' ~  D0 M" @# o# E2 t- C" ]  sDist = sqrt((Pt1(i,1) - Pt1(i-1,1))^2 +(Pt1(i,2) - Pt1(i-1,2))^2);
if Dist > 3
pt1(k,:) = Pt1(i,:);
pt2(k,:) = Pt2(i,:);
k = k + 1;
end
5 R) C/ L8 \, n, S* L5 s0 gend

[B1,IX] = sort(pt2(:,1));
Pt1 = pt1(IX,:);
; l; d5 [& d1 cPt2 = pt2(IX,:);
+ _0 E* E5 h# j+ k
kk = 1;
0 ?  W7 q3 f- _8 q- r. g. ypt1 = [];
, |; i5 i/ L9 n( ]/ G- xpt2 = [];
" F% O( b4 B! n7 J9 \. T6 W' Gfor i = 2:k-1
Dist = sqrt((Pt2(i,1) - Pt2(i-1,1))^2 +(Pt2(i,2) - Pt2(i-1,2))^2);
# Y! f' a  A1 x  t3 z5 E* Rif Dist > 3
8 y0 Y2 A, v+ ?  npt1(kk,:) = Pt1(i,:);
5 p4 K! K% u. p3 {pt2(kk,:) = Pt2(i,:);
kk = kk + 1;
* B5 R$ Z; O7 w6 O: Uend
4 U+ T( `' y+ U7 r7 nend

' N1 S* Q9 C5 S! X

littlestupid

好复杂