魔杖统计函数- Python

statistic()函数是Python Wand ImageMagick 库中的一个内置函数，用于将每个像素替换为来自相邻像素值的统计结果。宽度和高度定义了相邻像素的大小或孔径。

Syntax:

Parameters: This function accepts four parameters as mentioned above and defined below:

stat: This parameter stores the type of statistic to calculate. Some of the available statistics are ‘undefined’, ‘gradient’, ‘maximum’, ‘mean’, ‘median’, ‘minimum’, ‘mode’, ‘nonpeak’, ‘root_mean_square’, ‘standard_deviation’.
width: This parameter stores the size of neighboring pixels on the X-axis.
height: This parameter stores the size of neighboring pixels on the Y-axis.
channel: This parameter stores the available color channel.

Return Value: This function returns the Wand ImageMagick object.

编程需要懂一点英语

原图：

示例 1：

Python3

statistic(stat, width, height, channel)

Python3

# 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 statistic:
        # Invoke statistic function with statistic as median, width as 20
        # height as 10, channel as 'yellow'
        statistic.statistic('median', 20, 10, 'yellow')
        # Save the image
        statistic.save(filename ='statistic1.jpg')

输出：

示例 2：

Python3

# 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 circle 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 statistic function with statistic as root_mean_square, width as 20
        # height as 10, channel as 'green'
        pic.statistic('root_mean_square', 20, 10, 'green')
        # Save the image
        pic.save(filename ='statistic2.jpg')

输出：