读书报告
#numpy
1.基本函数的用法:
1 import numpy as np 2 3 a = np.ones((4,5)) 4 print(a) 5 print("\n") 6 print(a.ndim) 7 print(a.shape) 8 print(a.dtype) 9 print("\n") 10 b = np.random.rand(5,3) 11 print(b[2]) 12 print(b[1:3])
运行结果:
2.具体问题:
1 #2 如何对ndarray的每个变量求平方根 2 import numpy as np 3 a = np.array([1, 4, 9, 16, 25]) 4 result = np.sqrt(a) 5 print(result)
运行结果:
3.图像处理:
1 from PIL import Image 2 import numpy as np 3 vec_el = np.pi/2.2 4 vec_az = np.pi/4. 5 depth = 10. 6 im = Image.open('D:/学习/个人/pythonwork/textbook/gif/picframe00.png').convert('L') 7 a = np.asarray(im).astype('float') 8 grad = np.gradient(a) 9 grad_x, grad_y = grad 10 grad_x = grad_x*depth/100. 11 gead_y = grad_y*depth/100. 12 dx = np.cos(vec_el)*np.cos(vec_az) 13 dy = np.cos(vec_el)*np.sin(vec_az) 14 dz = np.sin(vec_el) 15 A = np.sqrt(grad_x**2 + grad_y**2 + 1.) 16 uni_x = grad_x/A 17 uni_y = grad_y/A 18 uni_z = 1./A 19 a2 = 255*(dx*uni_x + dy*uni_y + dz*uni_z) 20 a2 = a2.clip(0,255) 21 im2 = Image.fromarray(a2.astype('uint8')) 22 im2.save('D:/学习/个人/pythonwork/textbook/gif/HandDraw.jpg')
原图:
运行结果:
#scipy
1.基本函数的用法:
1 from scipy import constants 2 3 print(constants.pi) 4 print(constants.golden)
运行结果:
2.具体问题:
3.图像处理:
1 from matplotlib import pyplot as plt 2 3 # 使用Matplotlib进行图像处理 4 img=plt.imread('picframe00.png') 5 plt.imshow(img[::-1]) # 实现图片的垂直翻转翻转 6 # plt.imshow([:,::-1]) # 实现图片的水平翻转 7 plt.savefig("picframe00_.png") # 然后保存为其他图片
原图:
结果:
#pandas
1.基本函数的用法:
2.具体问题:
3.图像处理:
#matplotlib
1.基本函数的用法:
2.具体问题:
3.图像处理: