C :: Reading PPM Image Into 1D Or 2D Array

Apr 4, 2013

I have an assignment where I need to take an assigned image, rotate it 90 degrees to the right, flip it upside down, and turn it to grayscale; each with different outputs.

I was thinking if I can read in the image into a 2d array //array[height][width] or even just an array with the values of each pixel (r, g, b), I can just modify the array and spit it out when done.

if i can just get it into the array, I think I'll be fine. We've done similar assignments with modifying arrays for grayscale images and the other two I can probably figure out. But how am I going to read in each pixel into an array with three different values in each slot? This is my code so far:

Code:
#include<stdio.h>

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C :: Reading PPM Image Into 2 Dimensional Array

Nov 29, 2014

I'm trying to read a PPM image into an array. The header will have already been read in and I'm trying to put in a 2-d array to make manipulations easier. This is the code I have so far with LOTS of errors and warnings and I honestly don't know what almost any of them mean.

Code:

int imageArray( FILE *input, struct pixel *theArray ){
int i, j;
int col, row;
int *imageArray = (int**)malloc(row * sizeof(int*));
for(i=0; i<row; i++){

[Code]...

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C/C++ :: Reading Image From A File?

Sep 30, 2013

How to read an image in C++ ...

All what i know that i may use a Cimage library but it doesn't really work or to read the image from a file ....

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C/C++ :: Reading And Writing PPM File Image

Dec 7, 2014

I am attempting to read a ppm file. When i do it i try to write it back in another file just to see how's done and i get a terrible result. I assume the problem is something with the casting i do to the variables.

This is my image class

Image:: Image(unsigned int width, unsigned int height, bool interleaved) {
buffer = new Component [3*width*height];
this->height=height;
this->width=width;
this->buffer=Component();

[Code] .....

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Visual C++ :: Reading Image File?

Apr 26, 2013

I have a jpg file. I have extracted the width and the length of the image. I have done that with some codes and markers. Now I need the image data starts as from that place i would like read the data and print the pixel value. I would like to display the pixels later.

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Visual C++ :: Extract Portion Out By Reading Binary Image?

Apr 10, 2013

I need to know about image processing whether it can be done using C /c++ as I am not familiar with MATLAB. I have attached one image. The arrow in the image show the indented circular portion. I need to crop out only the portion inside the indented portion. I think there should be a sharp difference in gradient intensity in pixel at the indented portion. Is it possible to extract that portion out by reading the binary image?

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C++ :: Image / Video Compression Project - Error In Reading File

Apr 3, 2012

I have this image/video compression project that is to be done in C. I've been given this source code by my supervisor which is supposed to be a working one.

Assuming I have a sequence of 5 images in .pgm format (image41.pgm, image42.pgm .... image45.pgm). Some of the code involved is

Code:
#define START_FRAME 41
#define END_FRAME 45
#define SKIP_FRAME 1
#define INPUT_STRING "/home/folder/image%03d"
int main(){
int frameNo = START_FRAME
nx=1920, ny=1080;
char fileName[128];

[Code] ....

When I tried to compile the code using make file (shell script), I got this error message "In function 'readPgm' format '%d' expects argument of type 'int *', but argument 3 has type 'unsigned char *' "

Can identify what the problem is and how to rectify it?

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C :: Read A 24 Bit Image Using 2D Array

Oct 29, 2013

I am trying to read a 24 bit image but I'm getting errors when I'm tryting to read the pixels.

-The reading part looks bad because I'm reading both headers field by field. But I'm sure that it is reading both headers correctly.

-Right now my biggest concern is to get it to read successfully an entire bmp image

I'm using this calculation to get my padding bytes:

padding bytes = [4-(3*width)mod 4]mod 4

When I use a 2x2.bmp file to test it, I get an error that the [1][1] pixel was not read. When I use a bigger image it gives me the same error after about 100 rows and then every pixel is an error from that point on. This is what I got so far:

Code:

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
const size_t cSizeofPixel = 3; //size of struct tPixel
typedef struct{
unsigned char blue;
unsigned char green;
unsigned char red;

[Code]...

I read this post Reading 24 bit BMP file into a 2d array.

I still don't know if my error is when I allocate memory to my 2d array, or if I'm doing the padding bytes wrong or if it is something else.

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C++ :: Use 3D Array To Create Image

Sep 16, 2014

My assignment is use a 3D array to create an image. Use an array of the form arr[300][200][3]. For this homework, you need to use an array of the form arr[3][400][500]. It will have 400 rows and 500 columns. You need to first initialize the array as described in class and after that write the array to a ppm image file. When viewed using Gimp, it should display USM. The letters would be 200 pixels high and 100 pixels wide each. Use at least 15 pixels for the width of the stroke. Use different colors for each letter and a different color for the background.This is what I have so far.

#include <iostream>
#include <fstream>
#include <string>
using namespace std;

void initialize(unsigned char a[][200][3], int nrows, int ncols, int nc);
void printAll(unsigned char a[][200][3], int nrows, int ncols, int nc);

[code]....

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C# :: Compare The Image Of A Button To Another Image In Visual Studio

Jul 3, 2014

Im trying to compare the image of a button to another image in Visual Studio like so...

//variables
Image active = Image.FromFile("C:\Users\Ethan\Desktop\StarWars Status\active.png");
Image stunned = Image.FromFile("C:\Users\Ethan\Desktop\StarWars Status\stunned.png");

[Code]...

btnStatusPlr1.Image SHOULD come back as True.Then I realized it might not be the same as setting the buttons image in the properties (Which is what i did to get the original image (the one being compared to))

I do have a feeling ive done something wrong here (Yes im a noob /> )

Variable active, is the same image as the buttons default (Well should be)

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C++ :: Transform Integer Array To BMP Image

Jun 8, 2013

I have a problem concerning transforming int array into bmp image. I wanted to add a post in this topic: [URL] .... , but unfortunately it is closed. Actually I have a question concerning the code written by Duoas. I have a function which takes values from the file and I want to convert it into bmp with the use of Duoas code. I do it like that(it's Duoas code + my load and main function) Is it something wrong with how I do it or it's rather sth wrong with the file.

It compiles without errors but when I run it: core dumped.

According to gdb debugger problem is here: double hue = (intarray[ row - 1 ][ col ] - min_value) * granularity; programs stops, segmentation fault ...

#ifndef INTARRAY2BMP_HPP
#define INTARRAY2BMP_HPP
#include <fstream>
#include <iostream>
#include <string>

[Code] ....

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C++ :: Propagation Algorithm - Image To 2D Array

Feb 17, 2015

A few months ago I wrote a simple neural network using back propagation algorithm. It's input is a 2D array of any given size and type. I tried to make it learn the logic functions like AND & OR it worked. So now I want to try image recognition and I need the image as a 2D array of RGB values.(I mean three arrays of course one 2D array for each color.)

How can I get an array of RGB from an image? Can I do it with streams?

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C++ :: Retrieve The Image From URL And Save It In Array?

Sep 10, 2013

I am trying to retrieve an image from its URL as an array where each box represents the pixel value of the image.

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C++ :: Program To Read Image (Later Represent By Array 3D)

May 1, 2013

I will make a program to read the image in C++. And later, the image will represent by array 3D, which (x,y) represent the spatial coordinate of (height*weight) image (pixel) and z represent the intesity of those image (0-255).

In matlab, the code for do that is --> imread('image.jpg')

How can I do that in C++?

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C/C++ :: Convert 256 Color BMP Image To TXT File Of Array Of 0 - 255

Feb 5, 2015

I am working on a program which turns a 256 color bmp image to a txt file of a array of 0-255. I wrote this:

#include<iostream>
#include<fstream>
// if 1 , see bmp file header info
#if 1
#define SEE_INFO
#endif
using namespace std;

[Code] ....

Something weird happened. When I use it on simple.bmp (Attachment), it works fine. But when I use it on flower.bmp , it just give me zeros.

Attached File(s)

simple.bmp (3.39K)
simple.txt (8.47K)
flower.bmp (76.05K)
flower.txt (150.49K)

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Visual C++ :: How To Convert PNG Image Into Byte Array

Mar 12, 2013

I m loading a png image by using the ATLImage library.

CImage Image;
Image.Load (L"D:ImagesPNG_ImagesImage7.png");

how to retrieve the byte array value of this png image. I tried retrieving it as

byte *png = reinterpret_cast<BYTE *>(Image.GetBits());

but when i access the data , der is a loss of data while converting it in the above manner.

I found a snippet in net for decoding the raw data . but der is a line is the code which is unknown to me. The code is as follows :

CImage atlImage;
HMODULE hMod = GetModuleHandle(NULL);
atlImage.Load(bstr);
void* pPixel = atlImage.GetBits();
intpitch = atlImage.GetPitch();
intdepth = atlImage.GetBPP();

[Code] ....

How do I get the byte * value form the png image loaded?

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Visual C++ :: Draw Image Using 2D Byte Array?

Feb 8, 2013

I like to Draw an Image Using two dimensional byte array[512][256].

I used SetPixelV method to plot the image.

But Its very slow & hidden some buttons(Controls) at run time in the same dialog.

For reference i send some code,

Code:
for(row = 0; row <512; row ++)
{
for(col = 0; col < 256; col++)
{
Data[row][col] = y;
SetPixelV(d, 10+row, 10+col, RGB(Data[row][col],Data[row][col],Data[row][col]));
}
}

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C++ :: Saving RGB Pixel Data Of JPEG Image In 3D Array

Jan 6, 2015

I need to save RGB values of each pixel in a 3D array A[width][height][3]. I found a code online that transfers the bytes into an array but I cant understand how bytes are saved them so i could transfer them into an array. The truth is I dont know much about working with images at all so i have a problem working on them. How to transfer the RGB data from an .jpeg image into a 3D array? This is my code so far:

#include <iostream>
#include <jerror.h>
#include <jpeglib.h>
using namespace std;
int main(){
FILE *pic = fopen( "image.jpeg", "rb+" );

[Code] .....

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C/C++ :: Read BMP Image Data Into Multidimensional Array Of Structures

Apr 8, 2014

I am trying to read the information from a .bmp file into my program while dynamically allocating memory for all of it. So I defined the structures for the headers and for a pixel, and then I have to read each pixel into a multi-dimensional array of pixels. I am completely new to structures, and definitely new to pointers combined with structures. I will have to use a filter with the information later, but right now I just want to read everything in correctly. The array of pixels will be two-dimensional -- the width by the height of the image, I guess.

Here's my code:

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
int main(int argc, char *argv[]) {
FILE *inFile, *outFile;
typedef struct

[Code] ....

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Visual C++ :: Using 2D Array - Displaying Bitmap Image With Scrolling

Mar 11, 2014

My requirement is,

Read *.bmp image and displaying bitmap image with scrollbar in a MFC dialog application.

I was done using this

I was read the *.bmp image as a pixel data and stored by 2D Array,

Now i want to Display this 2D array as bitmap image with scrollbar separately in the same dialog. How can i display bitmap with scrollbar using 2D array?

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C++ :: Class Which Loads Bitmap Image Into One Dimension Char Array

Aug 27, 2013

I am writing a class which loads a bitmap image into a one dimension char* array.

This class has methods to allow for resampling and cropping the image before saving the bitmap image. It works perfectly for all images in which the width is divisible by 4. However when the width is not divisible by 4 the resulting bitmap is all mixed up.

I have spent much of the day googling this problem but to no avail. I know it is a problem with making sure the scanlines are DWORD aligned, and I believe I have done that correctly. I suspect that the problem is that I need to take the padding into account during the crop for loops but am lost to how to do this.

BTW: Coding on Linux using GCC

The following code is a cut down version from my bitmap class. I have removed methods which are not needed to make reading a little easier.

#include "BMP.h"
// FIXME (nikki#1#): Portrait bug on images of specific sizes
// TODO (nikki#1#): Memory leak checks
// THIS METHOD WRITES A BITMAP FILE FROM THE CHAR ARRAY .
bool BMP::saveBMP(string fileName, string *err) {
FILE *filePtr;

[Code]...

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Visual C++ :: Reading Into Array / 2d Array From Mixed Text File?

Jan 18, 2014

I know to read a strings into array and tables.. what is they are mixed up?? strings are just names ( 3 characters) and there are bunch of table.. the max size was set to 60

ex. text file

JES
DAN
JEN
.
.
.
01010101
10010101
RAM
JET
01010010
10100101
.... and so on

should i use a while loop?

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C/C++ :: Reading A File Into Array Then Reversing The Array

Jan 19, 2015

This is what I am supposed to be doing with this problem: Read the integer values in the file "numbers.dat" and display

* them in reverse order (that is, display the last number in the
* file first, the second-to-last second and so on). Use an array to
* store the values. It is safe to assume that the file contains no
* more than 100 values.

I have gotten far enough to read the file and display as an array, but it is displaying vertically rather than horizontally. So it is displaying 10 and a 1 on the first line then the 0 on the second line. Before I can work the reverse part out, I need it to display each number as 10 line 1 -235 line 2 so on and so forth.

This is my code so far:

void display_array_reversed() {
ifstream fin ("numbers.dat");
if (!fin){
cerr << "Error opening file" << endl;
exit(1);

[Code] .....

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C :: Reading From A File And 2D Array?

Apr 25, 2013

So if I have a file that has a list of scores and the name of the student, how am I going to read the scores and names, and print to output? For example, the text file will look like:

83 75 89 90 75 67 John Doe
67 92 78 64 88 95 Jane Waters
76 65 87 70 97 76 Billy Bob

And they'll be printed like that too.

I made a 2D array for the scores and names, and was able to scan the scores into the scoreArray, but I am stuck for the names. Do I use fscanf, fgets, etc? And how do I use these for a char array?

insert Code:
int main {
int scoreArray[NUM_ROW][NUM_COLUMN];
char nameArray[NUM_ROW][SIZE];
...........opened file, etc.

[ for (row=0; row<2; row++)
{ if(row>0)
{printf("

[Code] ....

When I run this, I get the scores and names (somewhat) in a jumbled mess.....

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C++ :: Reading In TXT File To 2D Array?

Mar 27, 2013

My assignment is to read in from a .txt file two things: an integer and a string. After reading in these 2 items I have to put them into a 10x10 2D array so that both the number and the character can be manipulated by the user. Here are the contents of the text file:

Dr. J's Garden
0.21,B, 2.80,G, 4.96,B, 2.66,B, 4.48,B, 0.61,T, 0.40,B, 3.50,G, 3.63,B, 3.91,T,
2.33,T, 4.51,G, 1.15,G, 4.95,T, 2.76,T, 4.51,T, 2.54,G, 4.04,T, 2.38,B, 0.62,B,
4.54,G, 3.38,T, 1.57,T, 3.92,T, 3.03,B, 4.72,G, 0.23,B, 4.02,G, 4.69,G, 0.66,G,
1.34,T, 2.21,G, 2.48,G, 4.85,T, 3.25,G, 3.55,G, 4.78,B, 0.81,G, 0.74,G, 2.55,G,
3.35,G, 4.52,G, 4.81,G, 2.67,G, 4.97,B, 0.87,G, 1.28,G, 4.58,B, 1.91,B, 3.69,B,
3.02,T, 3.15,T, 1.08,T, 4.68,G, 1.10,B, 3.17,G, 1.97,T, 0.99,G, 4.50,T, 3.87,T,
3.36,G, 1.60,T, 3.73,G, 2.14,B, 3.68,B, 2.44,G, 3.10,G, 4.54,B, 0.25,B, 0.25,G,
1.79,B, 3.02,G, 2.21,T, 0.22,G, 3.67,B, 4.46,G, 2.14,G, 2.31,G, 0.80,T, 3.83,B,
1.56,B, 1.41,T, 0.80,G, 1.27,T, 0.08,B, 1.20,G, 2.88,B, 2.78,T, 3.30,B, 1.75,B,
2.60,G, 4.72,T, 4.55,T, 0.89,B, 0.52,B, 2.06,T, 0.28,G, 4.36,T, 4.41,G, 0.36,B,

One number and one character need to be assigned to each element of the array. I know exactly how to fill a 2D array when it's just numbers, but the characters and the commas are giving me a lot of trouble.

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C/C++ :: Reading And Printing 2D Array?

Apr 10, 2015

I have a program where I need to read in a 96 number .txt file and perform some operations on it.However, the numbers it reads in are all inncorrect. I got it to work in XCode, but it doesnt work in DevC++ which is where the teacher will be running it. Do I have any major error?

#include <stdio.h>
#include <stdlib.h>
#define rows 8
#define cols 12
void makeArray(FILE*,int[][cols]);
int getScore(int[rows][cols],int,int);

[Code]......

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