我们生成一个简单的三维数组。首先导入numpy库 import numpy as np 1. 后面的as np就是给numpy设置别名,这样好调用。然后使用np.array()方法生成三维数组。 b = np.array([[[1,2,3,4],[1,2,3,4]],[[6,7,8,9],[11,12,13,14]]]) 1. 老师说这个三维数组按照她的办法很好理解。先写一对儿[ ...
我们首先需要导入cv2库和相关的模块: importcv2importrequestsimportnumpyasnp 1. 2. 3. 然后,我们需要从服务器上下载图片。可以使用requests库来发送HTTP请求并获得响应: url=' response=requests.get(url)image=np.asarray(bytearray(response.content),dtype="uint8")image=cv2.imdecode(image,cv2.IMREAD_COLOR)...
PIL.Image模块有函数Image.fromarray()函数 cv2有cv2.cvtColor()函数 numpy有numpy.asarray()函数 值得注意的是cv2用的是BGR,PIL用的是RGB #-*- coding=utf-8 -*-importosimportcv2fromPILimportImage'''opencv中图片格式为BGR pil中为RGB,需要转换一下'''importnumpy as npdefnumpy_to_cv(): image= np....
PIL fromPILimportImageimportnumpyasnp#读取图片,默认RGB,读取出来后不是array格式需进一步转换img=Image.open('photo.jpg').convert('RGB')#保存图片img.save('./savePhoto.jpg')#获取w,hw,h=img.size#图像缩放'''NEARESET:最邻近插值BILINEAR: 2x2区域的双线性插值BICUBIC: 4x4区域的双三次插值ANTIALIAS: ...
img.save(new_img_name, dpi=DPI) CV2读取、保存图片 #! /usr/bin/env python3#-*- coding:utf-8 -*-#Author : MaYi#Blog : http://www.cnblogs.com/mayi0312/#Date : 2020-09-29#Name : test.py#Software : PyCharm#Note : 用于PIL&cv2相互转换importcv2importnumpy as np ...
import cv2 import numpy as np # 读取一张斯里兰卡拍摄的大象照片 img = cv2.imread('lanka_safari.jpg') # 沿着横纵轴放大1.6倍,然后平移(-150,-240),最后沿原图大小截取,等效于裁剪并放大 M_crop_elephant = np.array([ [1.6, 0, -150], [0, 1.6, -240] ], dtype=np.float32) img_elephant ...
import matplotlib.pyplot as plt from PIL import Image import numpy as np img = Image.open('test.png') img_gray = img.convert('L') #转换成灰度图像 img = np.array(img) img_gray = np.array(img_gray) plt.imshow(img) # or plt.imshow(img / 255.0),matplotlib和matlab一样,如果是float...
image.png 混用CV和PIL图像读取,图像显示,发生保存颜色发生异常 这是由于plt和cv2图像的通道顺序是不一样的,所以交换第一通道和第三通道就可以了 importnumpyasnpimportcv2importmatplotlib.pyplotasplt img=cv2.imread('demo.jpg')(r,g,b)=cv2.split(img)img=cv2.merge([b,g,r])plt.imshow(img)plt.show(...
window: A python string, the name of the window in which to show the image img: A numpy array. Image to be shown. """while(1):# Will repeatedly show the image in given window.cv2.imshow(window, img) k = cv2.waitKey(1) &0xFF# Capture the code of the pressed key.# Stop the...
array-bounds -Wno-unknown-pragmas -Wno-unused-parameter -Wno-unused-function -Wno-unused-result -Wno-strict-overflow -Wno-strict-aliasing -Wno-stringop-overflow -Wno-psabi -Wno-error=pedantic -Wno-error=old-style-cast -Wno-invalid-partial-specialization -Wno-unused-private-field -Wno-aligned-...