private void TestToIsoTemplate(IEnumerable <MinutiaRecord> minutae, string isoTemplateHex)
{
// Get the IsoTemplate
byte[] template = IsoTemplateHelper.ToIsoTemplate(minutae);
// Convert the IsoTemplate back to a list of minutia (loss of data in casting)
IEnumerable <MinutiaRecord> convert_minutae = IsoTemplateHelper.ToMinutae(template);
// Convert it to Hex for comparison
string templateHex = BitConverter.ToString(template);
templateHex = templateHex.Replace("-", String.Empty);
// Assertions
CollectionAssert.AreEqual(IsoTemplateHelper.ToByteArray(isoTemplateHex), template);
Assert.AreEqual(minutae.Count(), convert_minutae.Count());
for (int i = 0; i < convert_minutae.Count(); i++)
{
MinutiaRecord real_minutia = minutae.ElementAt(i);
MinutiaRecord converted_minutia = convert_minutae.ElementAt(i);
Assert.AreEqual((int)real_minutia.Position.X, converted_minutia.Position.X);
Assert.AreEqual((int)real_minutia.Position.Y, converted_minutia.Position.Y);
// y(x,a) = ax - floor(ax)
// max(y(x,a)) = 1, min(y(x,a)) = 0
// e(x,a) = x - x_hat = 1/a * floor(ax) = 1/a * y(x,a)
// Thus max(e(x,a)) = 1/a, min(e(x,a)) = 0
Assert.IsTrue(real_minutia.Angle - converted_minutia.Angle < 1.0 / (256 / 360));
}
}
public static CaptureInfo ToCaptureInfo(XElement captureEl)
{
XElement imageLocationEl = captureEl.Element(ELEMENT_IMAGE_LOCATION);
XElement dbIdEl = captureEl.Element(ELEMENT_DB_ID);
XElement templateEl = captureEl.Element(ELEMENT_TEMPLATE);
// Assert xml structure is as expected
CheckElementNotNull(imageLocationEl, ELEMENT_IMAGE_LOCATION);
CheckElementNotNull(dbIdEl, ELEMENT_DB_ID);
CheckElementNotNull(templateEl, ELEMENT_TEMPLATE);
// Get info from elements
Uri imageLocation;
bool isUriParsed = Uri.TryCreate(imageLocationEl.Value, UriKind.Absolute, out imageLocation);
if (!isUriParsed)
{
throw new SimTemplateException(
String.Format("Failed to parse image URL string ({0}) to Uri", imageLocationEl.Value));
}
long dbId;
bool isIdParsed = long.TryParse(dbIdEl.Value, out dbId);
if (!isIdParsed)
{
throw new SimTemplateException(
String.Format("Failed to parse capture ID string ({0}) to long", dbIdEl.Value));
}
byte[] templateData = null;
if (!String.IsNullOrEmpty(templateEl.Value))
{
templateData = IsoTemplateHelper.ToByteArray(templateEl.Value);
}
byte[] imageData;
// Get image file from url
using (WebClient webClient = new WebClient())
{
imageData = webClient.DownloadData(imageLocation);
}
return(new CaptureInfo(dbId, imageData, templateData));
}
