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问题 I have the content of a pdf in base64 and I need to show it in a container in a flutter application. I'm trying to do it with the image, pdf and convert packages from dart,but I get an error with the image class and I don't know how to show the image. List<int> pdfDataBytes = base64.decode(fileContent); Image img = decodeImage(pdfDataBytes); PdfImage image = PdfImage( pdf, image: img.data.buffer.asUint8List(), width: img.width, height: img.height); This is the message of the error in the

问题 I have the content of a pdf in base64 and I need to show it in a container in a flutter application. I'm trying to do it with the image, pdf and convert packages from dart,but I get an error with the image class and I don't know how to show the image. List<int> pdfDataBytes = base64.decode(fileContent); Image img = decodeImage(pdfDataBytes); PdfImage image = PdfImage( pdf, image: img.data.buffer.asUint8List(), width: img.width, height: img.height); This is the message of the error in the

问题 How can we get the number of rows and columns in an Image table via Opencv. Code for getting boxes in table which I am getting right contours, hierarchy = cv2.findContours(img_final_bin, cv2.RETR_TREE, cv2.CHAIN_APPROX_SIMPLE) def sort_contours(cnts, method="left-to-right"): # initialize the reverse flag and sort index reverse = False i = 0 # handle if we need to sort in reverse if method == "right-to-left" or method == "bottom-to-top": reverse = True # handle if we are sorting against the y

问题 I can't figure out how to open a dng file in opencv. The file was created when using the pro options of the Samsung Galaxy S7. The images that are created when using those options are a dng file as well as a jpg of size 3024 x 4032 (I believe that is the dimensions of the dng file as well). I tried using the answer from here (except with 3 colors instead of grayscale) like so: import numpy as np fd = open("image.dng", 'rb') rows = 4032 cols = 3024 colors = 3 f = np.fromfile(fd, dtype=np.uint8

问题 I'm trying to do a parallel preload of images using the logic implemented on the below link. http://blog.lieldulev.com/2010/05/21/parallel-image-preloading-in-js/ I have a huge amount of images, currently 350+ images with an average of 50KB file size each, amounting to a total of 20MB of images im trying to preload. I need the images for canvas drawing. Using the above logic of parallel downloading, I'm having issues of the browser waiting for 2mins to finish loading the whole page. sometimes

问题 I am running docker on windows 10. I had a couple of images stored in my machine. The total size of these images accumulated to around ~10GB. I have deleted these images via ' docker rmi -f ' command. But the space occupied by these images has not been released. If I run 'docker images' command, the deleted images are not listed in the output of 'docker images' command(but the disk space is not cleaned up). How can I improve (ie. reduce) the disk space used by docker? 回答1: First try to run:

问题 I am running docker on windows 10. I had a couple of images stored in my machine. The total size of these images accumulated to around ~10GB. I have deleted these images via ' docker rmi -f ' command. But the space occupied by these images has not been released. If I run 'docker images' command, the deleted images are not listed in the output of 'docker images' command(but the disk space is not cleaned up). How can I improve (ie. reduce) the disk space used by docker? 回答1: First try to run:

问题 cv2.error: OpenCV(4.2.0) c:\projects\opencv python\opencv\modules\imgproc\src\color.simd_helpers.hpp:92: error: (-2:Unspecified error) in function '__cdecl cv::impl::`anonymous- namespace'::CvtHelper<struct cv::impl::`anonymous namespace'::Set<3,4,-1>,struct cv::impl::A0xe227985e::Set<1,-1,-1>,struct cv::impl::A0xe227985e::Set<0,2,5>,2>::CvtHelper(const class cv::_InputArray &,const class cv::_OutputArray &,int) > Invalid number of channels in input image: > 'VScn::contains(scn)' > where >

问题 cv2.error: OpenCV(4.2.0) c:\projects\opencv python\opencv\modules\imgproc\src\color.simd_helpers.hpp:92: error: (-2:Unspecified error) in function '__cdecl cv::impl::`anonymous- namespace'::CvtHelper<struct cv::impl::`anonymous namespace'::Set<3,4,-1>,struct cv::impl::A0xe227985e::Set<1,-1,-1>,struct cv::impl::A0xe227985e::Set<0,2,5>,2>::CvtHelper(const class cv::_InputArray &,const class cv::_OutputArray &,int) > Invalid number of channels in input image: > 'VScn::contains(scn)' > where >

问题 I wanted to know if it was possible to resize the image dynamically(maintaining its aspect ratio). I made an image viewer app, but then the vertically long images overflow the screen, so i wanted to know a method to resize image, ive tried a way and its included below. But still im getting the same output that overflows the screen. from win32api import GetSystemMetrics from tkinter import * screen_width, screen_height = GetSystemMetrics(0), GetSystemMetrics(1) root = Tk() # this is your