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Merge pull request #16841 from TolyaTalamanov:at/warp-perspective

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G-API: Implement WarpPerspective

* Implement WarpPerspective kernel

* Fix comment to review
This commit is contained in:
Anatoliy Talamanov
2020-03-25 14:23:32 +03:00
committed by GitHub
parent b0563ce368
commit c303aaa94d
6 changed files with 93 additions and 3 deletions
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modules/gapi/include/opencv2/gapi/core.hpp
+33 -1
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@@ -486,10 +486,18 @@ namespace core {
}
};
G_TYPED_KERNEL(GWarpPerspective, <GMat(GMat, const Mat&, Size, int, int, const cv::Scalar&)>, "org.opencv.core.warpPerspective") {
static GMatDesc outMeta(GMatDesc in, const Mat&, Size dsize, int, int borderMode, const cv::Scalar&) {
GAPI_Assert((borderMode == cv::BORDER_CONSTANT || borderMode == cv::BORDER_REPLICATE) &&
"cv::gapi::warpPerspective supports only cv::BORDER_CONSTANT and cv::BORDER_REPLICATE border modes");
return in.withType(in.depth, in.chan).withSize(dsize);
}
};
G_TYPED_KERNEL(GWarpAffine, <GMat(GMat, const Mat&, Size, int, int, const cv::Scalar&)>, "org.opencv.core.warpAffine") {
static GMatDesc outMeta(GMatDesc in, const Mat&, Size dsize, int, int border_mode, const cv::Scalar&) {
GAPI_Assert(border_mode != cv::BORDER_TRANSPARENT &&
"cv::BORDER_TRANSPARENT mode isn't support in G-API");
"cv::BORDER_TRANSPARENT mode is not supported in cv::gapi::warpAffine");
return in.withType(in.depth, in.chan).withSize(dsize);
}
};
@@ -1662,6 +1670,30 @@ number of channels as src and the depth =ddepth.
GAPI_EXPORTS GMat normalize(const GMat& src, double alpha, double beta,
int norm_type, int ddepth = -1);
/** @brief Applies a perspective transformation to an image.
The function warpPerspective transforms the source image using the specified matrix:
\f[\texttt{dst} (x,y) = \texttt{src} \left ( \frac{M_{11} x + M_{12} y + M_{13}}{M_{31} x + M_{32} y + M_{33}} ,
\frac{M_{21} x + M_{22} y + M_{23}}{M_{31} x + M_{32} y + M_{33}} \right )\f]
when the flag #WARP_INVERSE_MAP is set. Otherwise, the transformation is first inverted with invert
and then put in the formula above instead of M. The function cannot operate in-place.
@param src input image.
@param M \f$3\times 3\f$ transformation matrix.
@param dsize size of the output image.
@param flags combination of interpolation methods (#INTER_LINEAR or #INTER_NEAREST) and the
optional flag #WARP_INVERSE_MAP, that sets M as the inverse transformation (
\f$\texttt{dst}\rightarrow\texttt{src}\f$ ).
@param borderMode pixel extrapolation method (#BORDER_CONSTANT or #BORDER_REPLICATE).
@param borderValue value used in case of a constant border; by default, it equals 0.
@sa warpAffine, resize, remap, getRectSubPix, perspectiveTransform
*/
GAPI_EXPORTS GMat warpPerspective(const GMat& src, const Mat& M, const Size& dsize, int flags = cv::INTER_LINEAR,
int borderMode = cv::BORDER_CONSTANT, const Scalar& borderValue = Scalar());
/** @brief Applies an affine transformation to an image.
The function warpAffine transforms the source image using the specified matrix: