Python cv2 模块，ellipse2Poly() 实例源码

def findEllipses(edges):
    contours, _ = cv2.findContours(edges.copy(), cv2.RETR_LIST, cv2.CHAIN_APPROX_SIMPLE)
    ellipseMask = np.zeros(edges.shape, dtype=np.uint8)
    contourMask = np.zeros(edges.shape, dtype=np.uint8)

    pi_4 = np.pi * 4

    for i, contour in enumerate(contours):
        if len(contour) < 5:
            continue

        area = cv2.contourArea(contour)
        if area <= 100:  # skip ellipses smaller then 10x10
            continue

        arclen = cv2.arcLength(contour, True)
        circularity = (pi_4 * area) / (arclen * arclen)
        ellipse = cv2.fitEllipse(contour)
        poly = cv2.ellipse2Poly((int(ellipse[0][0]), int(ellipse[0][1])), (int(ellipse[1][0] / 2), int(ellipse[1][1] / 2)), int(ellipse[2]), 0, 360, 5)

        # if contour is circular enough
        if circularity > 0.6:
            cv2.fillPoly(ellipseMask, [poly], 255)
            continue

        # if contour has enough similarity to an ellipse
        similarity = cv2.matchShapes(poly.reshape((poly.shape[0], 1, poly.shape[1])), contour, cv2.cv.CV_CONTOURS_MATCH_I2, 0)
        if similarity <= 0.2:
            cv2.fillPoly(contourMask, [poly], 255)

    return ellipseMask, contourMask

def gl_display(self):
        """
        use gl calls to render
        at least:
            the published position of the reference
        better:
            show the detected postion even if not published
        """

        # debug mode within world will show green ellipses around detected ellipses
        if self.active and self.detected:
            for marker in self.markers:
                e = marker[-1] #outermost ellipse
                pts = cv2.ellipse2Poly( (int(e[0][0]),int(e[0][1])),
                                    (int(e[1][0]/2),int(e[1][1]/2)),
                                    int(e[-1]),0,360,15)
                draw_polyline(pts,1,RGBA(0.,1.,0.,1.))

        else:
            pass
        if self._window:
            self.gl_display_in_window()

def gl_display(self):
        """
        use gl calls to render
        at least:
            the published position of the reference
        better:
            show the detected postion even if not published
        """

        if self.active:
            draw_points_norm([self.smooth_pos],size=15,color=RGBA(1.,1.,0.,.5))

        if self.active and self.detected:
            for marker in self.markers:
                e = marker[-1]
                pts = cv2.ellipse2Poly( (int(e[0][0]),int(e[0][1])),
                                    (int(e[1][0]/2),int(e[1][1]/2)),
                                    int(e[-1]),0,360,15)
                draw_polyline(pts,color=RGBA(0.,1.,0,1.))
        else:
            pass

def gl_display(self):
        """
        use gl calls to render
        at least:
            the published position of the reference
        better:
            show the detected postion even if not published
        """

        if self.active:
            draw_points_norm([self.smooth_pos],size=15,color=RGBA(1.,1.,0.,.5))

        if self.active and self.detected:
            for marker in self.markers:
                e = marker[-1]
                pts = cv2.ellipse2Poly( (int(e[0][0]),int(e[0][1])),
                                    (int(e[1][0]/2),int(e[1][1]/2)),
                                    int(e[-1]),0,360,15)
                draw_polyline(pts,color=RGBA(0.,1.,0,1.))

            if self.counter:
                # lets draw an indicator on the count
                e = self.markers[0][-1]
                # cv2 requires integer arguments
                pts = cv2.ellipse2Poly( (int(e[0][0]),int(e[0][1])),
                                    (int(e[1][0]/2),int(e[1][1]/2)),
                                    int(e[-1]),0,360,360//self.counter_max)
                indicator = [e[0]] + pts[self.counter:].tolist()[::-1] + [e[0]]
                draw_polyline(indicator,color=RGBA(0.1,.5,.7,.8),line_type=GL_POLYGON)

            if self.auto_stop:
                # lets draw an indicator on the autostop count
                e = self.markers[0][-1]
                # cv2 requires integer arguments
                pts = cv2.ellipse2Poly( (int(e[0][0]),int(e[0][1])),
                                    (int(e[1][0]/2),int(e[1][1]/2)),
                                    int(e[-1]),0,360,360//self.auto_stop_max)
                indicator = [e[0]] + pts[self.auto_stop:].tolist() + [e[0]]
                draw_polyline(indicator,color=RGBA(8.,0.1,0.1,.8),line_type=GL_POLYGON)
        else:
            pass