Python Wand canny()用法及代码示例

canny()函数是Python Wand ImageMagick库中的内置函数，可通过利用multi-stage Canny算法来检测边。

用法：

canny(radius, sigma, lower_percent, upper_percent)

参数：该函数接受上面提到的和下面定义的两个参数：

radius:此参数存储高斯滤波器的半径。
sigma:此参数存储高斯滤波器的标准偏差。
lower_percent:此参数存储归一化的下阈值。
upper_percent:该参数存储归一化的上限阈值。

返回值：此函数返回Wand ImageMagick对象。

原始图片：

范例1：

# Import library from Image  
from wand.image import Image 
  
# Import the image 
with Image(filename ='../geeksforgeeks.png') as image:
    # Clone the image in order to process 
    with image.clone() as canny:
        # Invoke canny function  
        canny.canny(3, 2, 0.2, 0.8) 
        # Save the image 
        canny.save(filename ='canny1.jpg')

输出：

范例2：

# Import libraries from the wand   
from wand.image import Image 
from wand.drawing import Drawing 
from wand.color import Color 
  
with Drawing() as draw:
    # Set Stroke color the circle to black 
    draw.stroke_color = Color('black') 
    # Set Width of the circlw to 2  
    draw.stroke_width = 1
    # Set the fill color to 'White (# FFFFFF)' 
    draw.fill_color = Color('white') 
  
    # Invoke Circle function with center at 50, 50 and radius 25 
    draw.circle((200, 200), # Center point 
                (100, 100)) # Perimeter point 
    # Set the font style 
    draw.font = '../Helvetica.ttf'
    # Set the font size  
    draw.font_size = 30
      
    with Image(width = 400, height = 400, background = Color('# 45ff33')) as pic:
        # Set the text and its location 
        draw.text(int(pic.width / 3), int(pic.height / 2), 'GeeksForGeeks !') 
        # Draw the picture 
        draw(pic) 
        # Invoke canny function 
        pic.canny(4, 2, 0.3, 0.7) 
        # Save the image  
        pic.save(filename ='canny2.jpg')

输出：

相关用法

注：本文由纯净天空筛选整理自sarthak_ishu11大神的英文原创作品 Wand canny() function – Python。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。