上绘制图像的OpenCV

林usign蟒蛇和OpenCV一个圆圈，从摄像头获取的图像，我想知道如何绘制了我的形象了一圈，只是一个简单的绿色圆圈透明填充上绘制图像的OpenCV

enter image description here

我的代码：

import cv2 
import numpy 
import sys 

if __name__ == '__main__': 


    #get current frame from webcam 
    cam = cv2.VideoCapture(0) 
    img = cam.read() 

    #how draw a circle???? 

    cv2.imshow('WebCam', img) 

    cv2.waitKey()

在此先感谢。

来源

2013-05-10 Art Grc

cv2.circle打圈了我的形象，但我想圆的只是边界，任何想法？ – 2013-05-10 15:09:04

http://docs.opencv.org/2.4/modules/core/doc/drawing_functions.html 保持这个方便，同时使用绘图功能在opencv – 2016-08-14 08:57:13

cv2.circle(img, center, radius, color, thickness=1, lineType=8, shift=0) → None 
Draws a circle. 

Parameters: 
img (CvArr) – Image where the circle is drawn 
center (CvPoint) – Center of the circle 
radius (int) – Radius of the circle 
color (CvScalar) – Circle color 
thickness (int) – Thickness of the circle outline if positive, otherwise this indicates that a filled circle is to be drawn 
lineType (int) – Type of the circle boundary, see Line description 
shift (int) – Number of fractional bits in the center coordinates and radius value

仅对边框使用“厚度”参数。

来源

2013-05-10 15:14:14

尝试

cv2.circle(img, center, radius, color[, thickness[, lineType[, shift]]])

见documentation更多细节

来源

2013-05-10 16:35:38

这也有帮助http://www.aishack.in/2010/07/transparent-image-overlays-in-opencv /它的直方图叠加，但你可以叉它 – 2013-05-10 16:38:11

我还发现这个示例代码http://bistr-o-mathik.org/2012/06/13/simple-transparency-in- OpenCV的/ – 2013-05-10 16:42:27

只是一个额外的信息：

的OpenCV的绘图功能cv2.circle的参数 “中心”（）有两个一个元组整数。第一个是宽度位置，第二个是高度位置。该顺序与通常的数组索引不同。以下示例演示了该问题。

import numpy as np 
import cv2 

height, width = 150, 200 
img = np.zeros((height, width, 3), np.uint8) 
img[:, :] = [255, 255, 255] 

# Pixel position to draw at 
row, col = 20, 100 

# Draw a square with position 20, 100 as the top left corner 
for i in range(row, 30): 
    for j in range(col, 110): 
     img[i, j] = [0, 0, 255] 

# Will the following draw a circle at (20, 100)? 
# Ans: No. It will draw at row index 100 and column index 20. 
cv2.circle(img,(row, col), 5, (0,255,0), -1) 

cv2.imwrite("square_circle_opencv.jpg", img)

来源

2017-05-21 16:25:14 yang5

上绘制图像的OpenCV

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