How to get the picture alone extracted from a pdf using itextsharp in C#?

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C#3.5

PDF

I want to get the customer picture alone extracted from a pdf using itextsharp in c#. The issue is that in my PDF there would be bar code also be present if data entered fully fine.

What I have tried:

if (type != null && type.ToString().Equals(PdfName.IMAGE.ToString()))
                    {
                        if (flag == 0)//restrtict to take only one image
                        {
                            pio = new PdfImageObject(pst); //get the image
                            CustomerImage = ExtractedImagePath + DateTime.Now.ToString("ddMMyyyyHHmmss") + "image" + ".jpg";
                            fs = new FileStream(CustomerImage, FileMode.Create);
                            //read bytes of image in to an array
                            byte[] imgdata = pio.GetImageAsBytes();
                            //write the bytes array to file
                            fs.Write(imgdata, 0, imgdata.Length);
                            fs.Flush();
                            fs.Close();
                            CustomerImage = Path.GetFileName(CustomerImage);
                            flag = 1;
                        }