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Questionhelp with binary Pin
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Questionproblem about cvcamshift Pin
onlybluemoon12-Apr-09 6:38
onlybluemoon12-Apr-09 6:38 
hi
The orientation (θ) of the major axis and the scale of the distribution are determined by finding an equivalent rectangle that has the same moments as those measured from the 2D probability distribution image.But I can not understand clearly.
which algorithm cvcamshift choose?
thank you.


CV_CALL( cvMoments( &cur_win, &moments ));

m00 = moments.m00;
m10 = moments.m10;
m01 = moments.m01;
mu11 = moments.mu11;
mu20 = moments.mu20;
mu02 = moments.mu02;

if( fabs(m00) < DBL_EPSILON )
EXIT;

inv_m00 = 1. / m00;
xc = cvRound( m10 * inv_m00 + windowIn.x );//新计算出来的中心
yc = cvRound( m01 * inv_m00 + windowIn.y );
a = mu20 * inv_m00;//(x-x的中心)的平方*概率/总概率
b = mu11 * inv_m00;//(x-x的中心)(y-y的中心)*概率/总概率
c = mu02 * inv_m00;//(y-y的中心)的平方*概率/总概率

/* Calculating width & height */
square = sqrt( 4 * b * b + (a - c) * (a - c) );

/* Calculating orientation */
theta = atan2( 2 * b, a - c + square );

/*

原型:extern float atan2(float y, float x);

用法:#include <math.h>

功能:求y/x(弧度表示)的反正切值

说明:值域为(-π/2,+π/2)。

*/

/* Calculating width & length of figure */
cs = cos( theta );
sn = sin( theta );

rotate_a = cs * cs * mu20 + 2 * cs * sn * mu11 + sn * sn * mu02;
rotate_c = sn * sn * mu20 - 2 * cs * sn * mu11 + cs * cs * mu02;
length = sqrt( rotate_a * inv_m00 ) * 4;
width = sqrt( rotate_c * inv_m00 ) * 4;
Questionhow to delete cstring from specific index Pin
Aljaz11112-Apr-09 4:09
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QuestionRe: how to delete cstring from specific index Pin
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QuestionToo FEW Arguments in BOOL? Pin
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QuestionC++ FFT subroutine Pin
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Questioncan someone explain to a newby what the top line argument call. Pin
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