标签:显示图片 super 本地 nump port http imshow 指定 nbsp
cv2.imdecode()函数从指定的内存缓存中读取数据,并把数据转换(解码)成图像格式;主要用于从网络传输数据中恢复出图像。
cv2.imencode()函数是将图片格式转换(编码)成流数据,赋值到内存缓存中;主要用于图像数据格式的压缩,方便网络传输。
imdecode()使用
从网络读取图像数据并转换成图片格式:
# -*- coding: utf-8 -*- import numpy as np import urllib import cv2 url = ‘https://www.baidu.com/img/bd_logo1.png?where=super‘ resp = urllib.urlopen(url) image = np.asarray(bytearray(resp.read()), dtype="uint8") image = cv2.imdecode(image, cv2.IMREAD_COLOR) cv2.imshow(‘URL2Image‘,image) cv2.waitKey()
显示图片:
imencode()使用
将图片编码到缓存,并保存到本地:
# -*- coding: utf-8 -*- import numpy as np import urllib import cv2 img = cv2.imread(‘0122.jpg‘) # ‘.jpg‘表示把当前图片img按照jpg格式编码,按照不同格式编码的结果不一样 img_encode = cv2.imencode(‘.jpg‘, img)[1] # imgg = cv2.imencode(‘.png‘, img) data_encode = np.array(img_encode) str_encode = data_encode.tostring() # 缓存数据保存到本地 open(‘img_encode.txt‘, ‘wb‘) as f: f.write(str_encode) f.flush()
imencode()+imdecode()使用
图片编码保存到本地,读取本地文件解码恢复成图片格式:
# -*- coding: utf-8 -*- import numpy as np import urllib import cv2 img = cv2.imread(‘0122.jpg‘) # ‘.jpg‘表示把当前图片img按照jpg格式编码,按照不同格式编码的结果不一样 img_encode = cv2.imencode(‘.jpg‘, img)[1] # imgg = cv2.imencode(‘.png‘, img) data_encode = np.array(img_encode) str_encode = data_encode.tostring() # 缓存数据保存到本地,以txt格式保存 with open(‘img_encode.txt‘, ‘wb‘) as f: f.write(str_encode) f.flush() with open(‘img_encode.txt‘, ‘rb‘) as f: str_encode = f.read() nparr = np.fromstring(str_encode, np.uint8) img_decode = cv2.imdecode(nparr, cv2.IMREAD_COLOR) cv2.imshow("img_decode", img_decode) cv2.waitKey()
或
# -*- coding: utf-8 -*- import numpy as np import urllib import cv2 img = cv2.imread(‘0122.jpg‘) # ‘.jpg‘表示把当前图片img按照jpg格式编码,按照不同格式编码的结果不一样 img_encode = cv2.imencode(‘.jpg‘, img)[1] # imgg = cv2.imencode(‘.png‘, img) data_encode = np.array(img_encode) str_encode = data_encode.tostring() # 缓存数据保存到本地,以txt格式保存 with open(‘img_encode.txt‘, ‘wb‘) as f: f.write(str_encode) f.flush() with open(‘img_encode.txt‘, ‘rb‘) as f: str_encode = f.read() image = np.asarray(bytearray(str_encode), dtype="uint8") image = cv2.imdecode(image, cv2.IMREAD_COLOR) cv2.imshow(‘img_decode‘,image)
标签:显示图片 super 本地 nump port http imshow 指定 nbsp
原文地址:https://www.cnblogs.com/yinliang/p/11640713.html