How to get image matrix 2D using JavaScript / HTML5

Question

are there any solution of converting any image to the 2d matrix using html5/js example

picture.jpg -------be Converted to -----> matrice[W][H] of pixels
         


        

Answer 1

As others have noted, you can do this using a canvas element. I'd post a JSFiddle except this technique only works for images hosted on the same domain as the page (unless the image is cross-origin enabled)... and JSFiddle doesn't seem to host any suitable images to use in an example. So here's the code I used to test this:

// Get a reference to the image you want the pixels of and its dimensions
var myImage = document.getElementById('theImageToWorkWith');
var w = myImage.width, h = myImage.height;

// Create a Canvas element
var canvas = document.createElement('canvas');

// Size the canvas to the element
canvas.width = w;
canvas.height = h;

// Draw image onto the canvas
var ctx = canvas.getContext('2d');
ctx.drawImage(myImage, 0, 0);

// Finally, get the image data
// ('data' is an array of RGBA pixel values for each pixel)
var data = ctx.getImageData(0, 0, w, h);

Read up on canvas pixel manipulation for details. You might also want to verify the canvas tag is supported on browsers you care about.