尝试在Kivy核心图像中检索和显示时出现单代码解码错误

代码检索图像数据并打印,代码抛出的步骤2部分 UnicodeDecodeError . 在步骤3中,检索到的图像必须显示在Kivy CoreImage小部件上。

def populate_fields(self, instance): # NEW
      # Code retrieves text data and display in textinput fields here.
      ..... 
      .......


      # STEP 1: RETRIEVE IMAGE
      connection = sqlite3.connect("demo.db")
      with connection:
          cursor = connection.cursor()
          cursor.execute("SELECT UserImage from Users where 
          UserID=?",self.data_items[columns[0]]['text'] )
          image = cursor.fetchone()
          print(image[0]) 
      # Retrieve operation works as a image byte stream is printed as output.

      # STEP 2: CONVERT BLOB TO COREIMAGE
          image_loci = image[0]
          data = io.BytesIO(open(image_loci, 'rb').read())
          #image opened in binary mode
          im = CoreImage(data, ext="png")

      #STEP 3: SET OUTPUT TO IMAGE WIDGET
          self.image.source = im

• 数据库:sqlite3

• 表名:用户

• 列:userid、username、userimage

• 操作系统:窗口

回溯错误:

data = io.BytesIO(open(image_loci, 'rb').read()) #image opened in binary mode
UnicodeDecodeError: 'utf-8' codec can't decode byte 0x89 in position 0: invalid 
    start byte

我无法理解这个错误的原因。感谢您的帮助并期待您的投入。