Python Wand adaptive_threshold()用法及代碼示例

adaptive_threshold()函數是Python Wand ImageMagick庫中的內置函數，用於為每個像素應用閾值。它存在於wand.image類中。

用法：

adaptive_threshold(width, height, offset)

參數：該函數接受上麵提到的和下麵定義的三個參數：

width:此參數用於指定width的值，該值是X軸上相鄰像素的大小。
height:此參數用於指定高度值，該值是Y軸上相鄰像素的大小。
offset:此參數用於指定偏移量的值，該值是介於0.0和quantum_range之間的歸一化數字。
如果值低於偏移量，它將強製像素變黑。

注意：quantum_range：這是ImageMagick庫支持的顏色通道的最大值。

返回值：此函數返回Wand ImageMagick對象。

原始圖片：

範例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 adaptive_threshold:
        # Invoke adaptive_threshold function with width as 2, height as  
        # 3 and offset as 2 
        adaptive_threshold.adaptive_threshold(2, 3, 2) 
        # Save the image 
        adaptive_threshold.save(filename ='adaptive_threshold1.jpg')

輸出：

範例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 adaptive_threshold function with width as 0, Height as 1 and offset as 0.3 
        pic.adaptive_threshold(4, 5, 0.7) 
        # Save the image  
        pic.save(filename ='adaptive_threshold2.jpg')

輸出：

相關用法

注：本文由純淨天空篩選整理自sarthak_ishu11大神的英文原創作品 Wand adaptive_threshold() function – Python。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。