Initializes a new instance of this class.
ocrEngine
LEADTOOLS OCR engine instance to use for card processing.
ocrEngine must contain a valid and started IOcrEngine instance, otherwise, ProcessFrame will throw an exception. The card reader will use this OCR engine during all ProcessFrame calls, therefore, it is the user responsibility to ensure that ocrEngine will remain alive during the duration of IDCardReader and is disposed only when no more ProcessFrame are called.