87 lines
4.6 KiB
ReStructuredText
87 lines
4.6 KiB
ReStructuredText
Drawing Function of Keypoints and Matches
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=========================================
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drawMatches
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---------------
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Draws the found matches of keypoints from two images.
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.. ocv:function:: void drawMatches( InputArray img1, const vector<KeyPoint>& keypoints1, InputArray img2, const vector<KeyPoint>& keypoints2, const vector<DMatch>& matches1to2, InputOutputArray outImg, const Scalar& matchColor=Scalar::all(-1), const Scalar& singlePointColor=Scalar::all(-1), const vector<char>& matchesMask=vector<char>(), int flags=DrawMatchesFlags::DEFAULT )
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.. ocv:function:: void drawMatches( InputArray img1, const vector<KeyPoint>& keypoints1, InputArray img2, const vector<KeyPoint>& keypoints2, const vector<vector<DMatch> >& matches1to2, InputOutputArray outImg, const Scalar& matchColor=Scalar::all(-1), const Scalar& singlePointColor=Scalar::all(-1), const vector<vector<char> >& matchesMask=vector<vector<char> >(), int flags=DrawMatchesFlags::DEFAULT )
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.. ocv:pyfunction:: cv2.drawMatches(img1, keypoints1, img2, keypoints2, matches1to2[, outImg[, matchColor[, singlePointColor[, matchesMask[, flags]]]]]) -> outImg
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.. ocv:pyfunction:: cv2.drawMatchesKnn(img1, keypoints1, img2, keypoints2, matches1to2[, outImg[, matchColor[, singlePointColor[, matchesMask[, flags]]]]]) -> outImg
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:param img1: First source image.
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:param keypoints1: Keypoints from the first source image.
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:param img2: Second source image.
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:param keypoints2: Keypoints from the second source image.
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:param matches1to2: Matches from the first image to the second one, which means that ``keypoints1[i]`` has a corresponding point in ``keypoints2[matches[i]]`` .
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:param outImg: Output image. Its content depends on the ``flags`` value defining what is drawn in the output image. See possible ``flags`` bit values below.
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:param matchColor: Color of matches (lines and connected keypoints). If ``matchColor==Scalar::all(-1)`` , the color is generated randomly.
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:param singlePointColor: Color of single keypoints (circles), which means that keypoints do not have the matches. If ``singlePointColor==Scalar::all(-1)`` , the color is generated randomly.
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:param matchesMask: Mask determining which matches are drawn. If the mask is empty, all matches are drawn.
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:param flags: Flags setting drawing features. Possible ``flags`` bit values are defined by ``DrawMatchesFlags``.
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This function draws matches of keypoints from two images in the output image. Match is a line connecting two keypoints (circles). The structure ``DrawMatchesFlags`` is defined as follows:
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.. code-block:: cpp
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struct DrawMatchesFlags
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{
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enum
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{
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DEFAULT = 0, // Output image matrix will be created (Mat::create),
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// i.e. existing memory of output image may be reused.
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// Two source images, matches, and single keypoints
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// will be drawn.
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// For each keypoint, only the center point will be
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// drawn (without a circle around the keypoint with the
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// keypoint size and orientation).
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DRAW_OVER_OUTIMG = 1, // Output image matrix will not be
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// created (using Mat::create). Matches will be drawn
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// on existing content of output image.
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NOT_DRAW_SINGLE_POINTS = 2, // Single keypoints will not be drawn.
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DRAW_RICH_KEYPOINTS = 4 // For each keypoint, the circle around
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// keypoint with keypoint size and orientation will
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// be drawn.
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};
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};
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..
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drawKeypoints
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-----------------
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Draws keypoints.
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.. ocv:function:: void drawKeypoints( InputArray image, const vector<KeyPoint>& keypoints, InputOutputArray outImage, const Scalar& color=Scalar::all(-1), int flags=DrawMatchesFlags::DEFAULT )
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.. ocv:pyfunction:: cv2.drawKeypoints(image, keypoints[, outImage[, color[, flags]]]) -> outImage
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:param image: Source image.
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:param keypoints: Keypoints from the source image.
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:param outImage: Output image. Its content depends on the ``flags`` value defining what is drawn in the output image. See possible ``flags`` bit values below.
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:param color: Color of keypoints.
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:param flags: Flags setting drawing features. Possible ``flags`` bit values are defined by ``DrawMatchesFlags``. See details above in :ocv:func:`drawMatches` .
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.. note:: For Python API, flags are modified as `cv2.DRAW_MATCHES_FLAGS_DEFAULT`, `cv2.DRAW_MATCHES_FLAGS_DRAW_RICH_KEYPOINTS`, `cv2.DRAW_MATCHES_FLAGS_DRAW_OVER_OUTIMG`, `cv2.DRAW_MATCHES_FLAGS_NOT_DRAW_SINGLE_POINTS`
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