pgm | 易学教程

Error Opening PGM file with PIL and SKIMAGE

阅读更多关于 Error Opening PGM file with PIL and SKIMAGE

问题 I have following Image file: Image I used PIL and Skimage to open it but I get following errors First with PIL (tried with and without trucate option): Code: from PIL import Image, ImageFile ImageFile.LOAD_TRUNCATED_IMAGES = True img = Image.open("image_output.pgm") Erorr: OSError: cannot identify image file 'image_output.pgm' And with Skimage: Code: from skimage import io img = io.imread("image_output.pgm") Error: OSError: cannot identify image file <_io.BufferedReader name='image_output.pgm

Error Opening PGM file with PIL and SKIMAGE

阅读更多关于 Error Opening PGM file with PIL and SKIMAGE

PGM檔案格式

阅读更多关于 PGM檔案格式

PGM檔案格式 PGM檔案格式參考連結 PGM檔案格式 PGM全文Portable Gray Map，是一種圖片檔案格式。PGM圖像包含了以下幾個元素：一個magic number，代表檔案格式。PGM圖片的magic number是"P5"這兩個字元。空白符（空格，tab，CR，LF）寬度（W），用ASCII字元表示空白符高度（H），用ASCII字元表示空白符最大灰度值（Maxval），用ASCII字元表示單個空白符（通常是換行符號） H個row，每個row有W個灰度值。每個灰度值的範圍落在[0,Maxval]，0代表黑色，Maxval代表白色。在 TensorRT/samples/common/common.h 中讀取PGM檔案的函數： inline void readPGMFile ( const std :: string & fileName , uint8_t * buffer , int inH , int inW ) { /* explicit ifstream (const string& filename, ios_base::openmode mode = ios_base::in); mode: Flags describing the requested i/o mode for the file. binary mode:

How to read in data from a pgm file in C++

阅读更多关于 How to read in data from a pgm file in C++

问题 So far I can read every line and print it out to the console: void readFile(){ string line; ifstream myfile("example1.pgm"); if (myfile.is_open()){ while (myfile.good()){ getline (myfile,line); cout << line; } } However a pgm file apparently will always have the following at the start before the data: P2 # test.pgm 24 7 15 How can i adapt my code so that it checks that "P2" is present, ignores any comments (#), and stores the variables and subsequent pixel data? I'm a bit lost and new to c++

Combine two commands using GNU parallel for OCR project

阅读更多关于 Combine two commands using GNU parallel for OCR project

问题 I would like to write a script which runs a command to OCR pdfs, which deletes the resulting images, after the text files has been written. The two commands I want to combine are the following. This command create folders, extract pgm from each PDF and adds them into each folder: time find . -name \*.pdf | parallel -j 4 --progress 'mkdir -p {.} && gs -dQUIET -dINTERPOLATE -dSAFER -dBATCH -dNOPAUSE -dPDFSETTINGS=/screen -dNumRenderingThreads=4 -sDEVICE=pgmraw -r300 -dTextAlphaBits=4

Displaying histogram pixel values from PGM image (p5) using Pure C without any image processing library

阅读更多关于 Displaying histogram pixel values from PGM image (p5) using Pure C without any image processing library

问题 This question is challenging to get more understanding on Image Processing using pure C. I have done a simple program reading non-binary PGM file using C compiled with GCC. Now, it is becoming a problem when I try to read binary PGM file. This binary PGM file can be acquired by converting JPG to PGM using IrvanView. NOTE: Please don't answer with any image processing library (such as: OpenCV). My current code is: #include <stdio.h> #include <stdlib.h> #define WIDTH 1024 #define HEIGHT 768

Matlab is opening a pgm image with different values using imread

阅读更多关于 Matlab is opening a pgm image with different values using imread

问题 I have a pgm image with 1251 different pixel values, ranging from 0 to 1250. I know this because I can open this image file with kate and see the values. But when I open the same file using Matlab's imread, it also returns me 1251 different pixel values, but these values are not consecutive. The minimum value is 0 and the maximum value is 65483. I want to iterate through these values in a for loop so I need to read the original and consecutive values as they exist in the file. How to do that

Read and Write PGM (P5) Image File in PHP [closed]

阅读更多关于 Read and Write PGM (P5) Image File in PHP [closed]

问题 It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center. Closed 7 years ago . In PHP, a simple read and write file can be done by using fread() and fwrite() . The unpack() and pack() operator are used to extract binary information. The question is, how can I read and write PGM (P5) image

Viewing .pgm images in Matlab

阅读更多关于 Viewing .pgm images in Matlab

问题 I have been provided with a dataset consisting of .pgm images to be used for some coding in Matlab. I was just wondering if it is possible to view the same image as a .jpeg/.png in Matlab itself? Thanks 回答1: To visualize the image in matlab, imshow(imread('im.pgm')) To convert the image from pgm to jpeg : imwrite(imread('im.pgm'),'im.jpg') 回答2: The MathWorks docs on imread seem to suggest Matlab can read in a pgm file. Showing it should be a matter of using imshow on the resulting array

read.pnm() - error trying to read pgm image

阅读更多关于 read.pnm() - error trying to read pgm image

问题 I'm trying to read a pgm file in R. I set my wd to where the image is and then simply try to read it: setwd("~/3 Diplomado/5 Multivariado/lfwcrop_grey/faces") library(pixmap) x <- read.pnm(system.file("Aaron_Guiel_0001.pgm", package="pixmap")[1]) But I get the following error: Error in if (ch == "#") { : argument is of length zero In addition: Warning message: In file(file, open = "rb") : file("") only supports open = "w+" and open = "w+b": using the former Not sure what it is. I think it