如何处理通过 JavaScript 通过 WebSocket 发送回 Python 服务器的 blob

Question

我必须用Opencv在python服务器上处理图像。 blob 转到 python 服务器，但我无法弄清楚如何使用 openCV 将此 blob 转换回图像

 //this is my javascript function to send image converted to blob, 
//back to my python server
         function () {
             ctx.drawImage(video, 0, 0, 320, 240);
            var data = canvas.get()[0].toDataURL('image/jpeg', 1.0);
             newblob = dataURItoBlob(data);
             ws.send(newblob);
            }

这是我的 Python 后端处理

class EchoServerProtocol(WebSocketServerProtocol):
       def onMessage(self, msg, binary):
         img = # here the code to convert blob into the image
         blur = cv2.blur(img, (5, 5))
         hsv = cv2.cvtColor(blur, cv2.COLOR_BGR2HSV)
         msg = hsv
         print "the image:", msg
         #conver the image back to blob and reply back to the websocket
         #havent written the code for this part yet
         self.sendMessage(msg, binary)

请帮我弄清楚

Answer 1

看看这个blob是如何制作的，然后对它进行逆向工程