ocvu¶
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ocvu.
imshow
(window_name, image, border_color=(0, 0, 0))[source]¶ Improves default OpenCV imshow method by adding the possibility to correctly visualize small images without them being stretched. This is accomplished by adding a border around the image.
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class
ocvu.
Video
(filepath, grayscale=False)[source]¶ Bases:
object
OpenCV Video.
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fourcc
¶ 4-character code of codec.
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fps
¶ Frames per second.
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frame_number
¶ Number of the frame that will be read next.
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frames
¶ Returns an iterator with all frames.
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generate_background_model
(step=None, end=None, mse_min=50)[source]¶ Generates a background model using the median.
Only sufficiently different frames are considered, using the mean squared error method.
Parameters: - step – Step to iterate through the video. Default is video FPS rate.
- end – Last frame to consider. Default is 2/3 of video length.
- mse_min – The minimum error at wich the frame is selected. The lower the error, the more similar the two images are.
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nframes
¶ Returns the total number of frames.
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read_frame
(number=None, grayscale=False)[source]¶ Reads the current frame and returns it. You can also ask for a specific frame. Returns a Frame object.
Parameters: - number (int) – Number of the frame desired. If None, reads the current one.
- grayscale (bool) – Convert the frame read to grayscale.
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show_frame
(number=None, window=None, resize=False)[source]¶ Shows frame number in an OpenCV window. Returns the frame read.
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size
¶ Returns the size of the video frames: (width, height).
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class
ocvu.
Contour
(contour)[source]¶ Bases:
object
Provides a user-friendly object defining a contour in OpenCV. Adapted from: http://answers.opencv.org/question/6043/segmentation-and-contours/
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approx
¶ Lorem
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area
¶ Contour.area - Area bounded by the contour region
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bounding_box
¶ Lorem
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centroid
¶
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diameter
¶ EquivDiameter: diameter of circle with same area as region
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draw
(image, **kwargs)[source]¶ Draw contour.
kwargs
are passed tocv2.rectangle
method. Default color is green.
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draw_approx
(image, **kwargs)[source]¶ Draw approximated contour. kwargs are passed to cv2.rectangle method. Default color is red.
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draw_bounding_box
(image, **kwargs)[source]¶ Draw contour’s bounding box on image. kwargs are passed to cv2.rectangle method. Default color is white.
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draw_centroid
(image, radius=3, **kwargs)[source]¶ Draw contour’s centroid. kwargs are passed to cv2.circle method.
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draw_ellipse
(image, **kwargs)[source]¶ Draw contour’s ellipse. kwargs are passed to cv2.circle method.
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draw_hull
(image, **kwargs)[source]¶ Draw convex hull. kwargs are passed to cv2.rectangle method. Default color is blue.
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ellipse
¶ Fits an ellipse and returns the rotated rectangle in which the ellipse is inscribed.
The returned value is the tuple:
((x, y), (major_axis, minor_axis), angle)
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hull
¶ Lorem
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moments
¶ Lorem
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perimeter
¶ Lorem
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position
¶ Top left coordinate of the contour bounding box.
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