imread

openCV imread limit for large or huge images Mat bug #3258

由 倖福魔咒の 提交于 2021-02-20 02:52:42
问题 I've been searching for days about this issue and didn't find any solved thread. I need loading pretty large images (4 GB and beyond, either .tiff / .png) into openCV code, by means of a simple src = imread(filepath, 1); I'm using Visual Studio 2013, C++. Though I'm using a 96Gb-RAM machine, runtime alerts are coming out when loading these large images by OpenCV's "imread" function. Been trying with smaller and smaller images/files untill the point they are indeed read/loaded, so we know it's

cv2 imread transparency gone

由 江枫思渺然 提交于 2021-02-10 12:19:51
问题 I have an image (a captcha) that I download from the web. When I loaded to opencv it seems to loose its properties or simply mixes the transparent background with the dark/black colors: Currently the code does nothing but loading a writing again: captchaImg = cv2.imread('captcha1.png') cv2.imwrite("captcha2.png", captchaImg) I have tried loading also with options 0, 1, 2, 3 but the result is the same. 回答1: Well this is a problem with opencv and it has a solution with opencv but it is kind of

cv2 imread transparency gone

由 牧云@^-^@ 提交于 2021-02-10 12:18:06
问题 I have an image (a captcha) that I download from the web. When I loaded to opencv it seems to loose its properties or simply mixes the transparent background with the dark/black colors: Currently the code does nothing but loading a writing again: captchaImg = cv2.imread('captcha1.png') cv2.imwrite("captcha2.png", captchaImg) I have tried loading also with options 0, 1, 2, 3 but the result is the same. 回答1: Well this is a problem with opencv and it has a solution with opencv but it is kind of

Using cv2.imread: “<built-in function imread> returned NULL without setting an error”, as if it can't open the picture or get the data

由 为君一笑 提交于 2021-02-07 06:05:57
问题 This is the part of my code that gives the problem. It is supposed to count the amount of green pixels in a picture: img = Image.open('path.tif') BLACK_MIN = np.array([0, 20, 20], np.uint8) BLACK_MAX = np.array([120, 255, 255], np.uint8) imgg = cv2.imread(img, 1) dst = cv2.inRange(imgg, BLACK_MIN, BLACK_MAX) no_black = cv2.countNonZero(dst) print('The number of black pixels is: ' + str(no_black)) 回答1: You are passing a PIL image to imread but it expects a filepath (https://docs.opencv.org/2.4

matplotlib changes jpg image color

由 坚强是说给别人听的谎言 提交于 2021-01-27 22:14:37
问题 I'm reading images from filesystem using matplotlib imread function. However, it changes jpg image color when it displays those images. [Python 3.5, Anaconda3 4.3, matplotlib2.0] # reading 5 color images of size 32x32 imgs_path = 'test_images' test_imgs = np.empty((5,32,32,3), dtype=float) img_names = os.listdir('test_images'+'/') for i, img_name in enumerate(img_names): #reading in an image image = mpimg.imread(imgs_path+'/'+img_name) test_imgs[i] = image #Visualize new raw images plt.figure

Python + OpenCV - Reading the image file name

由 早过忘川 提交于 2020-12-27 06:24:14
问题 I have the following code snippet: img = cv2.imread('1.jpg') When I print img , I get the result shown below. How can I return the 1.jpg part only? [[[140 149 139] [153 162 152] [155 165 153] ..., [ 44 20 8] [ 46 22 10] [ 46 22 10]] [[151 160 150] [156 165 155] [152 162 150] ..., [ 47 23 11] [ 48 24 12] [ 45 21 9]] [[155 164 154] [152 161 151] [146 156 144] ..., [ 47 23 11] [ 49 25 13] [ 49 25 13]] ..., [[ 28 16 6] [ 33 21 11] [ 32 20 10] ..., [144 131 105] [150 137 111] [151 138 112]] [[ 33

Python + OpenCV - Reading the image file name

由 故事扮演 提交于 2020-12-27 06:22:19
问题 I have the following code snippet: img = cv2.imread('1.jpg') When I print img , I get the result shown below. How can I return the 1.jpg part only? [[[140 149 139] [153 162 152] [155 165 153] ..., [ 44 20 8] [ 46 22 10] [ 46 22 10]] [[151 160 150] [156 165 155] [152 162 150] ..., [ 47 23 11] [ 48 24 12] [ 45 21 9]] [[155 164 154] [152 161 151] [146 156 144] ..., [ 47 23 11] [ 49 25 13] [ 49 25 13]] ..., [[ 28 16 6] [ 33 21 11] [ 32 20 10] ..., [144 131 105] [150 137 111] [151 138 112]] [[ 33

Python + OpenCV - Reading the image file name

由 断了今生、忘了曾经 提交于 2020-12-27 06:22:11
问题 I have the following code snippet: img = cv2.imread('1.jpg') When I print img , I get the result shown below. How can I return the 1.jpg part only? [[[140 149 139] [153 162 152] [155 165 153] ..., [ 44 20 8] [ 46 22 10] [ 46 22 10]] [[151 160 150] [156 165 155] [152 162 150] ..., [ 47 23 11] [ 48 24 12] [ 45 21 9]] [[155 164 154] [152 161 151] [146 156 144] ..., [ 47 23 11] [ 49 25 13] [ 49 25 13]] ..., [[ 28 16 6] [ 33 21 11] [ 32 20 10] ..., [144 131 105] [150 137 111] [151 138 112]] [[ 33

OpenCV : undefined reference to imread()

由 我们两清 提交于 2020-06-24 11:17:05
问题 I have configured OpenCV 3.1.0 in Eclipse Mars. These are my configuration, G++ includes : D:/opencv/build/install/include; GCC includes : D:/opencv/build/install/include Linker libraries : libopencv_core310, libopencv_highgui310 Linker libraries path : D:/opencv/build/lib (files in this directory are like libopencv_core310.dll.a) I am getting an error like this, imageRead.cpp:15: undefined reference to `cv::imread(cv::String const&, int)' This is my imageRead.cpp file, #include <iostream>

Python图片读显写的几种方式

由 我的梦境 提交于 2020-03-16 17:51:07
一、读写路径 import os rootpath = os.getcwd() #当前文件夹路径，同文佳夹可直接读取 # rootpath = '' # 手动填写 readname = '/IDRiD_14.jpg' writename = '/IDRiD_15.jpg' readpath = os.path.normpath(rootpath + readname) writepath = os.path.normpath(rootpath + writename) 二、相应库 2.1 Imageio库 2.1.1 读取图片 # 可直接填写上述 readpath img = imageio.imread('test.png') # 常见图像格式 img = imageio.get_reader('cat.gif') # gif图像 video = imageio.get_reader('imageio:cockatoo.mp4')# 逐帧读取视频 # Grab screenshot or image from the clipboard im_screen = imageio.imread('<screen>') im_clipboard = imageio.imread('<clipboard>') #Read medical data (DICOM) dirname =
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