Android camera byte[] array to 2D array

Question

I'm a little confused about the byte[] array output from the Android camera. A picture is essentially a 2D array, so why is the output only 1D?

I'm trying to take the byte array output and perform a Fourier transform on it, and for that to happen I need the data to be in a 2D double array. So how do I get from the camera output byte array to a 2D double array?

Thanks

Kartik Chugh · Accepted Answer · 2017-12-04 06:49:11Z

2

The 1D array is flattened 2D array. To convert it to 2D array, you need something like this:

double[][] array2D = new double[width][height];

for(int i = 0 ; i < array2D.length ; i++)
{
    for(int j = 0 ; j < array2D[i].length ; i++)
    {
        array2D[i][j] = array1D[i * array2D.length + j];
    }
}

Width and height might be other way round.

edited Dec 4, 2017 at 6:49

Kartik Chugh

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answered Dec 21, 2012 at 7:11

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1 Comment

Kartik Chugh Over a year ago

I've been using Toast to print out the size of the byte array...the size changes every time. Sometimes its 413128, other times its 611611, or other numbers in between, so I don't get how this answer can possibly work.

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