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数组存储与指针学习笔记(一)数据类型与存储、数据对齐、数据移植、typedef文章来源:https://www.toymoban.com/news/detail-512604.html
最近涉及到Opencv用来求解轮廓与直线或者圆等规则物体的交点问题,特写下如下文章记录此。简单作出解释:通过创建轮廓与所求图像的掩膜,然后两者通过逻辑与运算得出交点位置。同理,求解两轮廓的交点方式也是一样的。
文章来源地址https://www.toymoban.com/news/detail-512604.html
DEBUG = True
def contourCirclesIntersect(original_image, contour, circles):
'''
计算轮廓与内外圆的圆弧以及圆弧的圆心角
@contour:轮廓数组
@circles:圆坐标(cx,cy,r)
return:
@points:交点数组
@arc_angle:圆弧圆心角
'''
# 获取图像大小
blank = np.zeros(original_image.shape[0:2])
# 创建轮廓与圆形的掩膜
image1 = cv2.drawContours(blank.copy(), contour, -1, 2)
image2 = cv2.circle(blank.copy(),(circles[0],circles[1]),circles[2],1,2)
# 逻辑与判断交点
intersection = np.logical_and(image1, image2)
# 获得交点位置
points = np.argwhere(intersection==True)
if len(points) >= 2: # 找出大于2个交点的领域
arc_angle = calcArcAngle(original_image,
center=(circles[0],circles[1]),
start=(points[0][1],points[0][0]),
end=(points[-1][1],points[-1][0]),
radius=circles[2],
fill=1,
color=(255,255,0)
)
R = circles[2]
if DEBUG:
if len(points):
cv2.circle(original_image,(points[0][1],points[0][0]),1,(0,255,0),2)
cv2.circle(original_image,(points[-1][1],points[-1][0]),1,(0,255,0),2)
cv2.line(original_image,(circles[0],circles[1]),(points[0][1],points[0][0]),(0,255,0),1)
cv2.line(original_image,(circles[0],circles[1]),(points[-1][1],points[-1][0]),(0,255,0),1)
return points,arc_angle
def contourLineIntersect(original_image,contour,line_pt):
'''
计算轮廓与直线的交点
@contour:轮廓数组
@line_pt:直线两点坐标[(x1,y1),(x2,y2)]
return:
@points:交点数组
'''
# 获取图像大小
blank = np.zeros(original_image.shape[0:2])
# 创建轮廓与直线的掩膜
image1 = cv2.drawContours(blank.copy(), contour, -1, 2)
image2 = drawLine(blank.copy(),(line_pt[0][0],line_pt[0][1]),(line_pt[1][0],line_pt[1][1]))
# 逻辑计算
intersection = np.logical_and(image1, image2)
# 获得交点位置
points = np.argwhere(intersection==True)
if DEBUG:
if len(points):
print('contourLineIntersect:',points)
cv2.circle(original_image,(points[0][1],points[0][0]),1,(0,255,0),2)
cv2.circle(original_image,(points[-1][1],points[-1][0]),1,(0,255,0),2)
return points
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