Exporting layers with coordinates from layer center

Hello, 

I've found a couple scripts that works exporting layers with coordinates. They work great, but with layer 0,0. I've found this topic here 

https://community.adobe.com/t5/photoshop/export-layer-coordinates-layer-width-and-height/td-p/9182055

and implemented the variables 

var LB = activeDocument.activeLayer.bounds;

var LWidth = (LB[2].value) - (LB[0].value);

var LHeight = (LB[3].value) - (LB[1].value)

But it looks like it gets the bottom corner of the layer. How to get it from the center? I'm testing a 512x512 image with two 128x128 image side by side. It should return 64x64 from the first square.

here is the code I'm using

// Bring application forward
app.bringToFront();

// Set active Document variable and decode name for output
var docRef = app.activeDocument;
var docName = decodeURI(activeDocument.name);

// Define pixels as unit of measurement
var defaultRulerUnits = preferences.rulerUnits;
preferences.rulerUnits = Units.PIXELS;

// Define variable for the number of layers in the active document
var layerNum = app.activeDocument.artLayers.length;


// Define variable for the active layer in the active document
var layerRef = app.activeDocument.activeLayer;


// Define varibles for x and y of layers
var LB = activeDocument.activeLayer.bounds;
var x = (LB[2].value) - (LB[0].value);
var y = (LB[3].value) - (LB[1].value);
var coords = "";

// Loop to iterate through all layers

function recurseLayers(currLayers) {
  for ( var i = 0; i < currLayers.layers.length; i++ ) {
    layerRef = currLayers.layers[i];
    x = (LB[2].value) - (LB[0].value);
    y = (LB[3].value) - (LB[1].value);
    coords += layerRef.name + ": " + x + "x" + "," + y + "y" + "\n";

//test if it's a layer set

    if ( isLayerSet(currLayers.layers[i]) ) {
      recurseLayers(currLayers.layers[i]);
    }
  }
}

//a test for a layer set

function isLayerSet(layer) {
  try {
    if ( layer.layers.length > 0 ) {
      return true;
    }
  }

  catch(err) {
    return false;
  }
}

// Ask the user for the folder to export to

var FPath = Folder.selectDialog("Save exported coordinates to");

// Detect line feed type

if ( $.os.search(/windows/i) !== -1 ) {
  fileLineFeed = "Windows";
}
else {
  fileLineFeed = "Macintosh";
}

// Export to txt file

function writeFile(info) {
  try {
    var f = new File(FPath + "/" + docName + ".txt");
    f.remove();
    f.open('a');
    f.lineFeed = fileLineFeed;
    f.write(info);
    f.close();
  }
  catch(e){}
}

// Run the functions

recurseLayers(docRef);
preferences.rulerUnits = defaultRulerUnits;

// Set preferences back to user's defaults

writeFile(coords);

// Show results

if ( FPath == null ) {
  alert("Export aborted", "Canceled");
}
else {
  alert("Exported " + layerNum + " layer's coordinates to " + FPath + "/" + 
docName + ".txt " + "using " + fileLineFeed + " line feeds.", "Success!");
}

. any help is greatly appreciated. Thanks