OpenCV

How to convert a rgb image into a cmyk?

由 僤鯓⒐⒋嵵緔 提交于 2021-01-20 06:10:47
问题 I want to convert a rgb image into cmyk. This is my code the first problem is, when I divide each pixel by 255 the value closes to zero so the result image is approximately black! The second problem is, I don't know how to convert the 1 channel resulted image to 4 channel. Of course I'm not sure the made CMYK in the following code is correct. Thank you for your attention import cv2 import numpy as np import time img = cv2.imread('image/dr_trump.jpg') B = img[:, :, 0] G = img[:, :, 1] R = img[

How to convert a rgb image into a cmyk?

由 白昼怎懂夜的黑 提交于 2021-01-20 06:08:30
问题 I want to convert a rgb image into cmyk. This is my code the first problem is, when I divide each pixel by 255 the value closes to zero so the result image is approximately black! The second problem is, I don't know how to convert the 1 channel resulted image to 4 channel. Of course I'm not sure the made CMYK in the following code is correct. Thank you for your attention import cv2 import numpy as np import time img = cv2.imread('image/dr_trump.jpg') B = img[:, :, 0] G = img[:, :, 1] R = img[

python cv2.calibrateCamera throws error: objectPoints should contain vector of vectors of points of type Point3f

由 放肆的年华 提交于 2021-01-19 05:59:36
问题 I have the code img = cv2.imread("poolPictures\chessboard3.jpg", cv2.IMREAD_COLOR) chessboardImage = cv2.imread("poolPictures\chessboardActual.jpg", cv2.IMREAD_COLOR) ret, corners = cv2.findChessboardCorners(img, (9,6), None) cv2.drawChessboardCorners(img, (9,6), corners, ret) chessRet, chessCorners = cv2.findChessboardCorners(chessboardImage, (9,6), None) ret, matrix, dist, rvecs, tvecs = cv2.calibrateCamera(corners, chessCorners, chessboardImage.shape[::-1][1:3], None, None)` Running the

cv2: [ WARN:0] global cap_msmf.cpp (674) SourceReaderCB::~SourceReaderCB terminating async callback [duplicate]

由 二次信任 提交于 2021-01-19 05:59:07
问题 This question already has answers here : CV2: “[ WARN:0] terminating async callback” when attempting to take a picture (8 answers) Closed 17 days ago . Full warning message: [ WARN:0] global C:\projects\opencv-python\opencv\modules\videoio\src\cap_msmf.cpp (674) SourceReaderCB::~SourceReaderCB terminating async callback Code: import numpy as np import cv2 captureDevice = cv2.VideoCapture(0) #captureDevice = camera while True: ret, frame = captureDevice.read() cv2.imshow('my frame', frame) if

cv2: [ WARN:0] global cap_msmf.cpp (674) SourceReaderCB::~SourceReaderCB terminating async callback [duplicate]

由 自古美人都是妖i 提交于 2021-01-19 05:58:36
问题 This question already has answers here : CV2: “[ WARN:0] terminating async callback” when attempting to take a picture (8 answers) Closed 17 days ago . Full warning message: [ WARN:0] global C:\projects\opencv-python\opencv\modules\videoio\src\cap_msmf.cpp (674) SourceReaderCB::~SourceReaderCB terminating async callback Code: import numpy as np import cv2 captureDevice = cv2.VideoCapture(0) #captureDevice = camera while True: ret, frame = captureDevice.read() cv2.imshow('my frame', frame) if

python cv2.calibrateCamera throws error: objectPoints should contain vector of vectors of points of type Point3f

由 陌路散爱 提交于 2021-01-19 05:58:09
问题 I have the code img = cv2.imread("poolPictures\chessboard3.jpg", cv2.IMREAD_COLOR) chessboardImage = cv2.imread("poolPictures\chessboardActual.jpg", cv2.IMREAD_COLOR) ret, corners = cv2.findChessboardCorners(img, (9,6), None) cv2.drawChessboardCorners(img, (9,6), corners, ret) chessRet, chessCorners = cv2.findChessboardCorners(chessboardImage, (9,6), None) ret, matrix, dist, rvecs, tvecs = cv2.calibrateCamera(corners, chessCorners, chessboardImage.shape[::-1][1:3], None, None)` Running the

python cv2.calibrateCamera throws error: objectPoints should contain vector of vectors of points of type Point3f

由 末鹿安然 提交于 2021-01-19 05:57:45
问题 I have the code img = cv2.imread("poolPictures\chessboard3.jpg", cv2.IMREAD_COLOR) chessboardImage = cv2.imread("poolPictures\chessboardActual.jpg", cv2.IMREAD_COLOR) ret, corners = cv2.findChessboardCorners(img, (9,6), None) cv2.drawChessboardCorners(img, (9,6), corners, ret) chessRet, chessCorners = cv2.findChessboardCorners(chessboardImage, (9,6), None) ret, matrix, dist, rvecs, tvecs = cv2.calibrateCamera(corners, chessCorners, chessboardImage.shape[::-1][1:3], None, None)` Running the

python cv2.calibrateCamera throws error: objectPoints should contain vector of vectors of points of type Point3f

由 爱⌒轻易说出口 提交于 2021-01-19 05:57:28
问题 I have the code img = cv2.imread("poolPictures\chessboard3.jpg", cv2.IMREAD_COLOR) chessboardImage = cv2.imread("poolPictures\chessboardActual.jpg", cv2.IMREAD_COLOR) ret, corners = cv2.findChessboardCorners(img, (9,6), None) cv2.drawChessboardCorners(img, (9,6), corners, ret) chessRet, chessCorners = cv2.findChessboardCorners(chessboardImage, (9,6), None) ret, matrix, dist, rvecs, tvecs = cv2.calibrateCamera(corners, chessCorners, chessboardImage.shape[::-1][1:3], None, None)` Running the

在python3下使用OpenCV 显示图像

由 末鹿安然 提交于 2021-01-18 06:55:03
在Python3下用使用OpenCV比在C,C++里开发不止快捷一点点, 原型开发的时候蛮有用. 这里用的OpenCV 加载图片, 用的imshow画图 # -*- coding: utf-8 -*- import cv2 # from matplotlib import pyplot as plt from pylab import * # 添加中文字体支持 from matplotlib.font_manager import FontProperties font = FontProperties(fname=r"c:\windows\fonts\SimSun.ttc",size = 14) # 载入图像 im = cv2.imread('window.png') # 显示原始图像 fig = plt.figure() subplot(121) plt.gray() im2 = cv2.cvtColor(im, cv2.COLOR_BGR2RGB) # OpenCV采用BGR排列顺序,需要转换一下. imshow(im2) title(u'彩色图', fontproperties= font) axis('off') # 显示灰度化图像 # 颜色空间转换 gray = cv2.cvtColor(im, cv2.COLOR_BGR2GRAY) plt.subplot(122)

《Python趣味创意编程》新书上架了

由 倾然丶 夕夏残阳落幕 提交于 2021-01-17 16:57:14
知乎视频 ​ www.zhihu.com 《Python趣味创意编程》新书上架，目前京东、淘宝、当当上搜书名就可以找到，比如： 【官方旗舰店】Python趣味创意编程 零基础入门自学python编程从入门到精通少儿编程入门教程语言程序设计基础数据分析学习手册 ​ detail.tmall.com 出版社图书页面，可以下载相关的代码、图片音乐素材： https://www. epubit.com/bookDetails? id=UBbf16e3464c71 下载Processing、配置Python Mode有问题的读者可以参考这里： 童晶：第1章 Python与Processing介绍（《Python趣味创意编程》教学视频） 本书内容结构 本书通过创意编程案例逐步引入语法知识，用Python从无到有地开发，提升读者对编程的兴趣和能力。全书共16章和两个附录。 第1章介绍了计算机程序和Python编程语言的基本概念，学习了互动艺术开发工具Processing的下载安装。 第2章学习了整数、变量、算术运算符等语法知识，实现了一个转动眼珠的圆脸（20行代码）。 第3章学习了for循环语句、整除、取余等语法知识，实现了催眠的同心圆（12行代码）。 第4章学习了if选择判断、比较大小运算符、逻辑运算符等语法知识，实现了旋转的圆弧（23行代码）。 第5章学习了类型转换
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