NodeJS realizes image text segmentation

var fs = require('fs');
var jpeg = require('jpeg-js')
 
 
function getSumRGB(data, i)
{
 var cr = data.data[i+0]
 var cg = data.data[i+1]
 var cb = data.data[i+2]
 var srgb = (cr+cg+cb)
 return srgb
}
 
function getTopRGB(data, i)
{
 var topIndex = (data.width * 4 * -1)
 i= i + topIndex;
 var cr = data.data[i+0]
 var cg = data.data[i+1]
 var cb = data.data[i+2]
 
 return [cr,cg,cb]
}
 
function getHeightRGB(data, i, haveRGB)
{
 var width = data.width
 var height = data.height
 var len = width * height * 4
 var haveNum = 0
 
 for(i=i;i<len;i+=width*4)
 {
  if(getSumRGB(data, i) == haveRGB)
  {
   haveNum++
  }
 }
 
 return haveNum
}
 
function ClearBackGround(data)
{ 
 var width = data.width
 var height = data.height
 var len = width * height * 4
 var i, tmp
 for(i=0;i<len;i+=4) 
 {
  tmp = getSumRGB(data, i)
  if(tmp > 120*3) {
   data.data[i+0]=255
   data.data[i+1]=255
   data.data[i+2]=255
  }
 }
 
 for(i=0;i<len;i+=4)
 {
  tmp = getSumRGB(data, i)
  if(tmp <= 32*3) {
   tmp = getTopRGB(data, i)
   data.data[i+0]=tmp[0]
   data.data[i+1]=tmp[1]
   data.data[i+2]=tmp[2]
  }
 }
 
 for(i=0;i<len;i+=4)
 {
  tmp = getSumRGB(data, i)
  if(tmp != 255*3) {
   data.data[i+0]=0
   data.data[i+1]=0
   data.data[i+2]=0
  }
 }
 
 var maxwidth = width * 4
 var arrlist = []
 arrlist[0]=[]
 arrlist[1]=[]
 arrlist[2]=[]
 arrlist[3]=[]
 arrnum = 0
 block = 0
 
 for(i=0;i<maxwidth;i+=4)
 {
  tmp = getHeightRGB(data, i, 0)
  if(tmp==0) {
   if(block != 0) {
    arrlist[arrnum] = [block/4,i/4]
    block=0
    arrnum++
   }
  } else if(tmp >0 ) {
   if(block == 0) {
    block = i
   }
  }
 }
 
 console.log(arrlist)
 
 return data
}
 
 
var picname = "tmp.jpg"
var newpicname = "000.jpg"
var jpegData = fs.readFileSync(picname)
var rawImageData = jpeg.decode(jpegData, {useTArray: true})
rawImageData = ClearBackGround(rawImageData)
var jpegImageData = jpeg.encode(rawImageData,100)
fs.writeFileSync(newpicname, jpegImageData.data)

//Picture cutting var ImgCropper = Class.create();
ImgCropper.prototype = {
  //Container object, control layer, image address initialize: function(container, handle, url, options) {
    this._Container = $(container);//Container objectthis._layHandle = $(handle);//Control layerthis.Url = url;//Image addressthis._layBase = this._Container.appendChild(document.createElement("img"));//Bottom layerthis._layCropper = this._Container.appendChild(document.createElement("img"));//Cutting layerthis._layCropper.onload = Bind(this, this.SetPos);
    //Used to set the size this._tempImg = document.createElement("img");
    this._tempImg.onload = Bind(this, this.SetSize);
    
    this.SetOptions(options);
    
    this.Opacity = Math.round(this.options.Opacity);
    this.Color = this.options.Color;
    this.Scale = !!this.options.Scale;
    this.Ratio = Math.max(this.options.Ratio, 0);
    this.Width = Math.round(this.options.Width);
    this.Height = Math.round(this.options.Height);
    
    //Set the preview object var oPreview = $(this.options.Preview); //Preview object if (oPreview) {
        oPreview.style.position = "relative";
        oPreview.style.overflow = "hidden";
        this.viewWidth = Math.round(this.options.viewWidth);
        this.viewHeight = Math.round(this.options.viewHeight);
        //Preview image object this._view = oPreview.appendChild(document.createElement("img"));
        this._view.style.position = "absolute";
        this._view.onload = Bind(this, this.SetPreview);
    }
    //Set up drag and drop this._drag = new Drag(this._layHandle, { Limit: true, onMove: Bind(this, this.SetPos), Transparent: true });
    //Set zoom this.Resize = !!this.options.Resize;
    if(this.Resize){
        var op = this.options, _resize = new Resize(this._layHandle, { Max: true, onResize: Bind(this, this.SetPos) });
        //Set the zoom trigger object op.RightDown && (_resize.Set(op.RightDown, "right-down"));
        op.LeftDown && (_resize.Set(op.LeftDown, "left-down"));
        op.RightUp && (_resize.Set(op.RightUp, "right-up"));
        op.LeftUp && (_resize.Set(op.LeftUp, "left-up"));
        op.Right && (_resize.Set(op.Right, "right"));
        op.Left && (_resize.Set(op.Left, "left"));
        op.Down && (_resize.Set(op.Down, "down"));
        op.Up && (_resize.Set(op.Up, "up"));
        //Minimum range limit this.Min = !!this.options.Min;
        this.minWidth = Math.round(this.options.minWidth);
        this.minHeight = Math.round(this.options.minHeight);
        //Set the scaling object this._resize = _resize;
    }
    //Set style this._Container.style.position = "relative";
    this._Container.style.overflow = "hidden";
    this._layHandle.style.zIndex = 200;
    this._layCropper.style.zIndex = 100;
    this._layBase.style.position = this._layCropper.style.position = "absolute";
    this._layBase.style.top = this._layBase.style.left = this._layCropper.style.top = this._layCropper.style.left = 0; //Alignment //Initialization settings this.Init();
  },
  //Set default properties SetOptions: function(options) {
    this.options = {//Default value Opacity: 50, //Transparency (0 to 100)
        Color: "", //Background colorWidth: 0, //Image heightHeight: 0, //Image height//Scaling trigger objectResize: false, //Whether to set scalingRight: "", //Right scaling objectLeft: "", //Left scaling objectUp: "", //Upper scaling objectDown: "", //Bottom scaling objectRightDown: "", //Bottom right scaling objectLeftDown: "", //Bottom left scaling objectRightUp: "", //Upper right scaling objectLeftUp: "", //Upper left scaling objectMin: false, //Whether to set minimum width and height limit (the min parameter below is useful when true)
        minWidth: 50, // minimum width minHeight: 50, // minimum height Scale: false, // whether to scale proportionally Ratio: 0, // scaling ratio (width/height)
        //Preview object settings Preview: "", //Preview object viewWidth: 0, //Preview width viewHeight: 0 //Preview height };
    Extend(this.options, options || {});
  },
  // Initialize the object Init: function() {
    //Set the background color this.Color && (this._Container.style.backgroundColor = this.Color);
    //Set the picture this._tempImg.src = this._layBase.src = this._layCropper.src = this.Url;
    //Set transparent if(isIE){
        this._layBase.style.filter = "alpha(opacity:" + this.Opacity + ")";
    } else {
        this._layBase.style.opacity = this.Opacity / 100;
    }
    //Set the preview object this._view && (this._view.src = this.Url);
    //Set zoom if (this.Resize) {
        with(this._resize){
            Scale = this.Scale; Ratio = this.Ratio; Min = this.Min; minWidth = this.minWidth; minHeight = this.minHeight;
        }
    }
  },
  //Set cutting style SetPos: function() {
    //IE6 rendering bug
    if (isIE6) { with (this._layHandle.style) { zoom = .9; zoom = 1; }; };
    //Get position parameters var p = this.GetPos();
    //Cut according to the parameters of the drag and drop object this._layCropper.style.clip = "rect(" + p.Top + "px " + (p.Left + p.Width) + "px " + (p.Top + p.Height) + "px " + p.Left + "px)";
    //Set preview this.SetPreview();
  },
  //Set the preview effect SetPreview: function() {
    if(this._view){
        //Preview display width and height var p = this.GetPos(), s = this.GetSize(p.Width, p.Height, this.viewWidth, this.viewHeight), scale = s.Height / p.Height;
        //Set parameters proportionally var pHeight = this._layBase.height * scale, pWidth = this._layBase.width * scale, pTop = p.Top * scale, pLeft = p.Left * scale;
        //Set the preview object with(this._view.style){
            //Set style width = pWidth + "px"; height = pHeight + "px"; top = - pTop + "px "; left = - pLeft + "px";
            //Cutting preview image clip = "rect(" + pTop + "px " + (pLeft + s.Width) + "px " + (pTop + s.Height) + "px " + pLeft + "px)";
        }
    }
  },
  //Set the image size SetSize: function() {
    var s = this.GetSize(this._tempImg.width, this._tempImg.height, this.Width, this.Height);
    //Set the base map and cutting map this._layBase.style.width = this._layCropper.style.width = s.Width + "px";
    this._layBase.style.height = this._layCropper.style.height = s.Height + "px";
    //Set the drag and drop range this._drag.mxRight = s.Width; this._drag.mxBottom = s.Height;
    //Set the zoom range if (this.Resize) { this._resize.mxRight = s.Width; this._resize.mxBottom = s.Height; }
  },
  //Get the current style GetPos: function() {
    with(this._layHandle){
        return { Top: offsetTop, Left: offsetLeft, Width: offsetWidth, Height: offsetHeight }
    }
  },
  //Get size GetSize: function(nowWidth, nowHeight, fixWidth, fixHeight) {
    var iWidth = nowWidth, iHeight = nowHeight, scale = iWidth / iHeight;
    //Set according to the proportion if (fixHeight) { iWidth = (iHeight = fixHeight) * scale; }
    if(fixWidth && (!fixHeight || iWidth > fixWidth)){ iHeight = (iWidth = fixWidth) / scale; }
    //Return size object return { Width: iWidth, Height: iHeight }
  }
}