pgm | 易学教程

Reading a pgm file in Java

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问题 I need to read a pgm file and store the array of values contained in it in a 2D array. In PGM format, each pixel is specified by a gray value between 0 and MaxVal. The first three lines give information related to the image: magic number, height, width and maxVal. The file also includes whitespaces. Lines starting with # are comments. This is what I had written till now. public class PGM{ public static void main(String args[]) throws Exception { FileInputStream f = new FileInputStream("C:\\..

Create JavaFX Image from PGM or TIFF as fast as possible

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问题 I'm capturing images from a scanner device with java. The input format ist PGM or TIFF. I have to show up live results in the user interface. Actually I'm using ImageJ to read the source input stream as tiff, because ImageJ can also handle incomplete streams. After that the ImagePlus object is converted into a BufferedImage and finally into a JavaFX Image . ImagePlus imagePlus = new Opener().openTiff(inputStream, ""); BufferedImage bufferedImage = imagePlus.getBufferedImage(); Image image =

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

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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 simply doesnt find the image. What am I doing wrong? any hints? Thank you in advanced! J. Simply try this

Python and 16-bit PGM

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问题 I have 16-bit PGM images that I am trying to read in Python. It seems (?) like PIL does not support this format? import Image im = Image.open('test.pgm') im.show() Shows roughly the image, but it isn't right. There are dark bands throughout and img is reported to have mode=L . I think this is related to an early question I had about 16-bit TIFF files. Is 16-bit that rare that PIL just does not support it? Any advice how I can read 16-bit PGM files in Python, using PIL or another standard

Create JavaFX Image from PGM or TIFF as fast as possible

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I'm capturing images from a scanner device with java. The input format ist PGM or TIFF. I have to show up live results in the user interface. Actually I'm using ImageJ to read the source input stream as tiff, because ImageJ can also handle incomplete streams. After that the ImagePlus object is converted into a BufferedImage and finally into a JavaFX Image . ImagePlus imagePlus = new Opener().openTiff(inputStream, ""); BufferedImage bufferedImage = imagePlus.getBufferedImage(); Image image = SwingFXUtils.toFXImage(bufferedImage, null); This is very slow. I need a faster way to create the JavaFX

Python and 16-bit PGM

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I have 16-bit PGM images that I am trying to read in Python. It seems (?) like PIL does not support this format? import Image im = Image.open('test.pgm') im.show() Shows roughly the image, but it isn't right. There are dark bands throughout and img is reported to have mode=L . I think this is related to an early question I had about 16-bit TIFF files . Is 16-bit that rare that PIL just does not support it? Any advice how I can read 16-bit PGM files in Python, using PIL or another standard library, or home-grown code? nobar The following depends only on numpy to load the image, which can be 8

How do I capture images in OpenCV and saving in pgm format?

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问题 I am brand new to programming in general, and am working on a project for which I need to capture images from my webcam (possibly using OpenCV), and save the images as pgm files. What's the simplest way to do this? Willow Garage provides this code for image capturing: http://opencv.willowgarage.com/wiki/CameraCapture Using this code as a base, how might I modify it to: capture an image from the live cam every 2 seconds save the images to a folder in pgm format Thanks so much for any help you

Segmentation faults occur when I run a parallel program with Open MPI

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问题 on my previous post I needed to distribute data of pgm files among 10 computers. With help from Jonathan Dursi and Shawn Chin, I have integrate the code. I can compile my program but it got segmentation fault. I ran but nothing happen mpirun -np 10 ./exmpi_2 balloons.pgm output.pgm The result is [ubuntu:04803] *** Process received signal *** [ubuntu:04803] Signal: Segmentation fault (11) [ubuntu:04803] Signal code: Address not mapped (1) [ubuntu:04803] Failing at address: 0x7548d0c [ubuntu

“Standard” RGB to Grayscale Conversion

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问题 I'm trying to write a converters algorithm that takes a JPEG image and returns its PGM (Portable Gray Map) version. The problem is that I can't understand how the "official" JPG->PGM convertitors work in terms of what value to assign to the final pixel (i guess, 0->255) starting from the classic RGB format. At the beginning, I used this formula (it's the same used by OpenCV's CV_RGB2GRAY conversion): 0.30*R + 0.59*G + 0.11*B = val I wrote a simple code to test my results: it takes a color

How to read a .pgm image file in a 2D double array in C

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The question is quite simple: How to read a .pgm image file into a 2D double array in C. I do not have a .pgm buffer in memory. I would like to read it from the disk into memory. Would really appreciate if I could get a code snippet. Thank You. You probably won't get someone writing you all the code, but here are some useful links that might point you in the right direction: pgm.c pgm.h PGM Format Specification http://www.cplusplus.com/forum/general/2393/ If its saved as ASCII you could just read it with the "normal" file reading methods of C. You can of course use the netpbm library (linux