node.jS怎么实现图片跟文本分离

这篇文章主要讲解了"node.jS怎么实现图片跟文本分离"，文中的讲解内容简单清晰，易于学习与理解，下面请大家跟着小编的思路慢慢深入，一起来研究和学习"node.jS怎么实现图片跟文本分离"吧！

本文实例为大家分享了NodeJS实现图片文本分割的具体代码，供大家参考，具体内容如下

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 120*3) {   data.data[i+0]=255   data.data[i+1]=255   data.data[i+2]=255  } }  for(i=0;i0 ) {   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)

再为大家分享JS实现图片切割的方法：

//图片切割var ImgCropper = Class.create();ImgCropper.prototype = {  //容器对象,控制层,图片地址  initialize: function(container, handle, url, options) {    this._Container = $(container);//容器对象    this._layHandle = $(handle);//控制层    this.Url = url;//图片地址        this._layBase = this._Container.appendChild(document.createElement("img"));//底层    this._layCropper = this._Container.appendChild(document.createElement("img"));//切割层    this._layCropper.onload = Bind(this, this.SetPos);    //用来设置大小    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);        //设置预览对象    var oPreview = $(this.options.Preview);//预览对象    if(oPreview){        oPreview.style.position = "relative";        oPreview.style.overflow = "hidden";        this.viewWidth = Math.round(this.options.viewWidth);        this.viewHeight = Math.round(this.options.viewHeight);        //预览图片对象        this._view = oPreview.appendChild(document.createElement("img"));        this._view.style.position = "absolute";        this._view.onload = Bind(this, this.SetPreview);    }    //设置拖放    this._drag = new Drag(this._layHandle, { Limit: true, onMove: Bind(this, this.SetPos), Transparent: true });    //设置缩放    this.Resize = !!this.options.Resize;    if(this.Resize){        var op = this.options, _resize = new Resize(this._layHandle, { Max: true, onResize: Bind(this, this.SetPos) });        //设置缩放触发对象        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"));        //最小范围限制        this.Min = !!this.options.Min;        this.minWidth = Math.round(this.options.minWidth);        this.minHeight = Math.round(this.options.minHeight);        //设置缩放对象        this._resize = _resize;    }    //设置样式    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;//对齐    //初始化设置    this.Init();  },  //设置默认属性  SetOptions: function(options) {    this.options = {//默认值        Opacity:    50,//透明度(0到100)        Color:        "",//背景色        Width:        0,//图片高度        Height:        0,//图片高度        //缩放触发对象        Resize:        false,//是否设置缩放        Right:        "",//右边缩放对象        Left:        "",//左边缩放对象        Up:            "",//上边缩放对象        Down:        "",//下边缩放对象        RightDown:    "",//右下缩放对象        LeftDown:    "",//左下缩放对象        RightUp:    "",//右上缩放对象        LeftUp:        "",//左上缩放对象        Min:        false,//是否最小宽高限制(为true时下面min参数有用)        minWidth:    50,//最小宽度        minHeight:    50,//最小高度        Scale:        false,//是否按比例缩放        Ratio:        0,//缩放比例(宽/高)        //预览对象设置        Preview:    "",//预览对象        viewWidth:    0,//预览宽度        viewHeight:    0//预览高度    };    Extend(this.options, options || {});  },  //初始化对象  Init: function() {    //设置背景色    this.Color && (this._Container.style.backgroundColor = this.Color);    //设置图片    this._tempImg.src = this._layBase.src = this._layCropper.src = this.Url;    //设置透明    if(isIE){        this._layBase.style.filter = "alpha(opacity:" + this.Opacity + ")";    } else {        this._layBase.style.opacity = this.Opacity / 100;    }    //设置预览对象    this._view && (this._view.src = this.Url);    //设置缩放    if(this.Resize){        with(this._resize){            Scale = this.Scale; Ratio = this.Ratio; Min = this.Min; minWidth = this.minWidth; minHeight = this.minHeight;        }    }  },  //设置切割样式  SetPos: function() {    //ie6渲染bug    if(isIE6){ with(this._layHandle.style){ zoom = .9; zoom = 1; }; };    //获取位置参数    var p = this.GetPos();    //按拖放对象的参数进行切割    this._layCropper.style.clip = "rect(" + p.Top + "px " + (p.Left + p.Width) + "px " + (p.Top + p.Height) + "px " + p.Left + "px)";    //设置预览    this.SetPreview();  },  //设置预览效果  SetPreview: function() {    if(this._view){        //预览显示的宽和高        var p = this.GetPos(), s = this.GetSize(p.Width, p.Height, this.viewWidth, this.viewHeight), scale = s.Height / p.Height;        //按比例设置参数        var pHeight = this._layBase.height * scale, pWidth = this._layBase.width * scale, pTop = p.Top * scale, pLeft = p.Left * scale;        //设置预览对象        with(this._view.style){            //设置样式            width = pWidth + "px"; height = pHeight + "px"; top = - pTop + "px "; left = - pLeft + "px";            //切割预览图            clip = "rect(" + pTop + "px " + (pLeft + s.Width) + "px " + (pTop + s.Height) + "px " + pLeft + "px)";        }    }  },  //设置图片大小  SetSize: function() {    var s = this.GetSize(this._tempImg.width, this._tempImg.height, this.Width, this.Height);    //设置底图和切割图    this._layBase.style.width = this._layCropper.style.width = s.Width + "px";    this._layBase.style.height = this._layCropper.style.height = s.Height + "px";    //设置拖放范围    this._drag.mxRight = s.Width; this._drag.mxBottom = s.Height;    //设置缩放范围    if(this.Resize){ this._resize.mxRight = s.Width; this._resize.mxBottom = s.Height; }  },  //获取当前样式  GetPos: function() {    with(this._layHandle){        return { Top: offsetTop, Left: offsetLeft, Width: offsetWidth, Height: offsetHeight }    }  },  //获取尺寸  GetSize: function(nowWidth, nowHeight, fixWidth, fixHeight) {    var iWidth = nowWidth, iHeight = nowHeight, scale = iWidth / iHeight;    //按比例设置    if(fixHeight){ iWidth = (iHeight = fixHeight) * scale; }    if(fixWidth && (!fixHeight || iWidth > fixWidth)){ iHeight = (iWidth = fixWidth) / scale; }    //返回尺寸对象    return { Width: iWidth, Height: iHeight }  }}

感谢各位的阅读，以上就是"node.jS怎么实现图片跟文本分离"的内容了，经过本文的学习后，相信大家对node.jS怎么实现图片跟文本分离这一问题有了更深刻的体会，具体使用情况还需要大家实践验证。这里是，小编将为大家推送更多相关知识点的文章，欢迎关注！