實現不多說，直接貼程式碼

方式一：用Image來設定源資料為一張圖片。從而把圖片畫出來。

function setImage()
{
  console.log("set Image");
  var canvas = document.getElementById('m_canvas');
  var ctx = canvas.getContext('2d');
  var image = new Image();
  image.src = 'image.png';

  image.onload=function(){
    ctx.drawImage(image,10,10);
    var
 
 imagedata = ctx.getImageData(50,50,400,400);
    ctx.createImageData(imagedata);
  }
}

方式二：利用ImageData來繪製，ImageData中填的是Uint8ClampedArray的RGBA資料。

//data為原始RGBA的資料,width ,height 為原始圖片寬和高
var m_data = Uint8ClampedArray.from(data);
var m_imageData = new ImageData(m_data,width,height);

 var canvas = document.getElementById("canvas"
 
);

 canvas.width = m_videoInfo.dwWidth;
 canvas.height = m_videoInfo.dwHeight;
 canvas.getContext('2d').putImageData(m_imageData,0,0);