Hi here is an example using c#
string fileName = "picture.jpg", myStringWebResource = null;
// Create a new WebClient instance.
WebClient myWebClient = new WebClient();
// Concatenate the domain with the Web resource filename.
myStringWebResource = "http://192.168.1.151/Streaming/channels/101/picture?snapShotImageType=JPEG";
Console.WriteLine("Downloading File \"{0}\" from \"{1}\" .......\n\n", fileName, myStringWebResource);
string credentials = Convert.ToBase64String(System.Text.Encoding.ASCII.GetBytes("admin:12345"));
myWebClient.Headers[system.Net.HttpRequestHeader.Authorization] = "Basic " + credentials;
// Download the Web resource and save it into the current filesystem folder.
myWebClient.DownloadFile(myStringWebResource, fileName);
Console.WriteLine("Successfully Downloaded File \"{0}\" from \"{1}\"", fileName, myStringWebResource);
Console.WriteLine("\nDownloaded file saved in the following file system folder:\n\t" );