Allow users to upload image and modify then within app using opencv

Dash Python
1

My app should allow user to upload an image from browser, followed by some operations using opencv, and then it needs to display modified image back. My problem is in update_output function. When I pass i, I see the image in the browser, however if I pass dataURI (modified version of image using opencv), then image is never displayed in a browser. Could someone help me please?

  #app = Dash(__name__, external_stylesheets=external_stylesheets)
  app.layout = html.Div([
      dcc.Upload(
          id='upload-image',
          children=html.Div([
              'Drag and Drop or ',
              html.A('Select Files')
          ]),
      ),
      html.Div(id='output-image-upload'),
      dcc.Store(id='store-data', storage_type='memory')
  ])
  
  @app.callback(Output('store-data', 'data'), Input('upload-image', 'contents') )
  
  def store_data(value): return value
  
  def data_uri_to_cv2_img(uri):
      encoded_data = uri.split(',')[1]
      nparr = np.fromstring(base64.b64decode(encoded_data), np.uint8)
      img = cv2.imdecode(nparr, cv2.IMREAD_COLOR)
      return img
  
  def parse_contents(contents):
      return html.Div([
          html.Img(src=contents, style={'height':'10%', 'width':'10%'})
      ])
  
  @app.callback(
      Output('output-image-upload', 'children'),
      Input('store-data', 'data')
  )
  
  def update_output(images):
      if not images:
          return
  
      children = []
      for i in images:
        img1 = data_uri_to_cv2_img(i)
        #some operations -- skip for now
        _, buffer = cv2.imencode('.jpg', img1)
        jpg_as_text = base64.b64encode(buffer.tobytes())
        dataURI = 'data:image/jpeg;base64,' + str(jpg_as_text) 
  
      children.append(parse_contents(dataURI))
      return children
  
  
  if __name__ == '__main__':
     app.run_server(host='localhost',port=8005, debug = True)