2023（春）Python程序设计作业4：Numpy 和 Pillow在图像处理中的应用

[软工213-507-杨俊杰]

任务 1）从以下网站：南通大学[学校掠影](https://www.ntu.edu.cn/77/list.htm）任选一副图片下载，用Python程序显示原始图片。

from PIL import Image

img_path = 'C:/Users/LongQian/OneDrive/图片/本机照片/Saved Pictures/111.jpg'
img = Image.open(img_path)
img.show()

 

任务 2）将图片变成黑白图片，并用Python程序显示。

from PIL import Image

img_path = 'C:/Users/LongQian/OneDrive/图片/本机照片/Saved Pictures/111.jpg'
img = Image.open(img_path)
img_bw = img.convert('L')

img_bw.show()

 

任务3）将图片左右翻转，并用Python程序显示。

from PIL import Image

img_path = 'C:/Users/LongQian/OneDrive/图片/本机照片/Saved Pictures/111.jpg'

img = Image.open(img_path)

img_lr = img.transpose(Image.FLIP_LEFT_RIGHT)

img_lr.show()

 

任务4）将图片上下翻转，并用Python程序显示。

from PIL import Image

img_path = 'C:/Users/LongQian/OneDrive/图片/本机照片/Saved Pictures/111.jpg'

img = Image.open(img_path)

img_ud = img.transpose(Image.FLIP_TOP_BOTTOM)
img_ud.show()

 

任务5）对像素值计算

from PIL import Image
import numpy as np
img_path = 'C:/Users/LongQian/OneDrive/图片/本机照片/Saved Pictures/111.jpg'

img = Image.open('C:/Users/LongQian/OneDrive/图片/本机照片/Saved Pictures/111.jpg')
img_array = np.array(img)
int_cropped = img_array[0:500, 0:500, (2, 1, 2)]
int_flipped = int_cropped[:, ::-1, :]
Image.fromarray(int_flipped*2).show()