extract characters into strings

// Create our application instance
var app =
    new PIXI.Application
    (
        {
            width: window.innerWidth,
            height: window.innerHeight,
            backgroundColor: 0x2c3e50
        }
    );

document.body.appendChild(app.view);

app.loader.add( 'font', 'https://i.imgur.com/AbFrBbV.png' ).load( startup );

function startup()
{
    var imageSprite = new PIXI.Sprite(app.loader.resources.font.texture);
    let base64 = app.renderer.plugins.extract.base64( imageSprite );
    console.log( base64 );
    const bwFilter = new PIXI.filters.ColorMatrixFilter();
    bwFilter.greyscale(1);
    imageSprite.filters = [ bwFilter ];

    app.stage.addChild( imageSprite );
    app.ticker.add
    (
        () =>
        {
            app.render();
        }
    );

    let newSprite = PIXI.Sprite.from( base64 );
    newSprite.tint = 0xFFFF00;
    app.stage.addChild( newSprite );
    const charWidth = 9;
    const charHeight = 16;
    const binaryStrings = [];

    let img = imageSprite.texture.baseTexture.resource.source;
    let canvas = document.createElement( "CANVAS" );
    canvas.width = 144; canvas.height = 256;

    let ctx = canvas.getContext( '2d' );
    ctx.drawImage( img, 0, 0 );
    console.log( "canvas width: " + canvas.width + ", canvas height: " + canvas.height );
    console.log( "image width: " + imageSprite.width + ", image height: " + imageSprite.height );
    for( let y = 0; y < canvas.height; y += charHeight )
    {
        for( let x = 0; x < canvas.width; x += charWidth )
        {
            let binaryString = '';
            for( let charY = 0; charY < charHeight; charY++ )
            {
                for( let charX = 0; charX < charWidth; charX++ )
                {
                    const pixelData = ctx.getImageData( x + charX, y + charY, 1, 1 ).data;
                    if( pixelData[0] === 0 &&
                        pixelData[1] === 0 &&
                        pixelData[2] === 0 &&
                        pixelData[3] === 255 )
                    {
                        binaryString += '0';
                    }
                    else
                    {
                        binaryString += '1';
                    }
                }
            }
            binaryStrings.push( binaryString );
            console.log( binaryString.length );
        }
    }
    console.log( binaryStrings.length );

}