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Fixed trim ratio estimation for the case of homographies motion model (videostab)

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This commit is contained in:
Alexey Spizhevoy
2012-04-23 06:42:55 +00:00
parent ae8d377561
commit 36ef599840
2 changed files with 30 additions and 18 deletions
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18
modules/videostab/src/motion_stabilizing.cpp
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@@ -616,11 +616,15 @@ static inline bool isGoodMotion(const float M[], float w, float h, float dx, flo
{
Point2f pt[4] = {Point2f(0,0), Point2f(w,0), Point2f(w,h), Point2f(0,h)};
Point2f Mpt[4];
float z;
for (int i = 0; i < 4; ++i)
{
Mpt[i].x = M[0]*pt[i].x + M[1]*pt[i].y + M[2];
Mpt[i].y = M[3]*pt[i].x + M[4]*pt[i].y + M[5];
z = M[6]*pt[i].x + M[7]*pt[i].y + M[8];
Mpt[i].x /= z;
Mpt[i].y /= z;
}
pt[0] = Point2f(dx, dy);
@@ -640,6 +644,9 @@ static inline void relaxMotion(const float M[], float t, float res[])
res[3] = M[3]*(1.f-t);
res[4] = M[4]*(1.f-t) + t;
res[5] = M[5]*(1.f-t);
res[6] = M[6]*(1.f-t);
res[7] = M[7]*(1.f-t);
res[8] = M[8]*(1.f-t) + t;
}
@@ -651,11 +658,12 @@ Mat ensureInclusionConstraint(const Mat &M, Size size, float trimRatio)
const float h = static_cast<float>(size.height);
const float dx = floor(w * trimRatio);
const float dy = floor(h * trimRatio);
const float srcM[6] =
const float srcM[] =
{M.at<float>(0,0), M.at<float>(0,1), M.at<float>(0,2),
M.at<float>(1,0), M.at<float>(1,1), M.at<float>(1,2)};
M.at<float>(1,0), M.at<float>(1,1), M.at<float>(1,2),
M.at<float>(2,0), M.at<float>(2,1), M.at<float>(2,2)};
float curM[6];
float curM[9];
float t = 0;
relaxMotion(srcM, t, curM);
if (isGoodMotion(curM, w, h, dx, dy))
@@ -687,11 +695,15 @@ float estimateOptimalTrimRatio(const Mat &M, Size size)
Point2f pt[4] = {Point2f(0,0), Point2f(w,0), Point2f(w,h), Point2f(0,h)};
Point2f Mpt[4];
float z;
for (int i = 0; i < 4; ++i)
{
Mpt[i].x = M_(0,0)*pt[i].x + M_(0,1)*pt[i].y + M_(0,2);
Mpt[i].y = M_(1,0)*pt[i].x + M_(1,1)*pt[i].y + M_(1,2);
z = M_(2,0)*pt[i].x + M_(2,1)*pt[i].y + M_(2,2);
Mpt[i].x /= z;
Mpt[i].y /= z;
}
float l = 0, r = 0.5f;