Example with image rendering functionality

examples/fingerprint_picturetest.py

@@ -0,0 +1,263 @@
+# SPDX-FileCopyrightText: 2023 Jim McKeown
+# SPDX-License-Identifier: MIT
+
+"""
+This example shows the basic functionality to:
+Show the devices fingerprint slots that have fingerprints enrolled.
+Enroll a fingerprint in an existing or new fingerprint slot.
+Try to find a fingerprint in the existing list of enrolled fingerprints.
+Delete an enrolled fingerprint.
+View the image of a fingerprint.
+Preview the image of a fingerprint and then try to find the fingerprint
+in the existing list of enrolled fingerprints.
+
+Please note that this example only works on single board computers
+with the use of Blinka.
+
+This example is based on fingerprint_simpletest.py
+"""
+
+import time
+import numpy as np
+from matplotlib import pyplot as plt
+import serial
+import adafruit_fingerprint
+
+# led = DigitalInOut(board.D13)
+# led.direction = Direction.OUTPUT
+
+# This has not been tested:
+# uart = busio.UART(board.TX, board.RX, baudrate=57600)
+
+# If using with a computer such as Linux/RaspberryPi, Mac, Windows with USB/serial converter:
+# Edit ttyACM0 to your USB/serial port
+uart = serial.Serial("/dev/ttyACM0", baudrate=57600, timeout=1)
+
+# If using with Linux/Raspberry Pi and hardware UART:
+# import serial
+# uart = serial.Serial("/dev/ttyS0", baudrate=57600, timeout=1)
+
+finger = adafruit_fingerprint.Adafruit_Fingerprint(uart)
+
+##################################################
+
+
+def get_fingerprint():
+    """Get a finger print image, template it, and see if it matches!"""
+    print("Waiting for image...")
+    while finger.get_image() != adafruit_fingerprint.OK:
+        pass
+    print("Templating...")
+    if finger.image_2_tz(1) != adafruit_fingerprint.OK:
+        return False
+    print("Searching...")
+    if finger.finger_search() != adafruit_fingerprint.OK:
+        return False
+    return True
+
+
+# pylint: disable=too-many-branches
+def get_fingerprint_detail():
+    """Get a finger print image, template it, and see if it matches!
+    This time, print out each error instead of just returning on failure"""
+    print("Getting image...", end="")
+    i = finger.get_image()
+    if i == adafruit_fingerprint.OK:
+        print("Image taken")
+    else:
+        if i == adafruit_fingerprint.NOFINGER:
+            print("No finger detected")
+        elif i == adafruit_fingerprint.IMAGEFAIL:
+            print("Imaging error")
+        else:
+            print("Other error")
+        return False
+
+    print("Templating...", end="")
+    i = finger.image_2_tz(1)
+    if i == adafruit_fingerprint.OK:
+        print("Templated")
+    else:
+        if i == adafruit_fingerprint.IMAGEMESS:
+            print("Image too messy")
+        elif i == adafruit_fingerprint.FEATUREFAIL:
+            print("Could not identify features")
+        elif i == adafruit_fingerprint.INVALIDIMAGE:
+            print("Image invalid")
+        else:
+            print("Other error")
+        return False
+
+    print("Searching...", end="")
+    i = finger.finger_fast_search()
+    # pylint: disable=no-else-return
+    # This block needs to be refactored when it can be tested.
+    if i == adafruit_fingerprint.OK:
+        print("Found fingerprint!")
+        return True
+    else:
+        if i == adafruit_fingerprint.NOTFOUND:
+            print("No match found")
+        else:
+            print("Other error")
+        return False
+
+
+def get_fingerprint_photo():
+    """Get and show fingerprint image"""
+    print("Waiting for image...")
+    while finger.get_image() != adafruit_fingerprint.OK:
+        pass
+    print("Got image...Transferring image data...")
+    imgList = finger.get_fpdata("image", 2)
+    imgArray = np.zeros(73728, np.uint8)
+    for i, val in enumerate(imgList):
+        imgArray[(i * 2)] = val & 240
+        imgArray[(i * 2) + 1] = (val & 15) * 16
+    imgArray = np.reshape(imgArray, (288, 256))
+    plt.title("Fingerprint Image")
+    plt.imshow(imgArray)
+    plt.show(block=False)
+
+
+def get_fingerprint_preview():
+    """Get a finger print image, show it, template it, and see if it matches!"""
+    print("Waiting for image...")
+    while finger.get_image() != adafruit_fingerprint.OK:
+        pass
+    print("Got image...Transferring image data...")
+    imgList = finger.get_fpdata("image", 2)
+    imgArray = np.zeros(73728, np.uint8)
+    for i, val in enumerate(imgList):
+        imgArray[(i * 2)] = val & 240
+        imgArray[(i * 2) + 1] = (val & 15) * 16
+    imgArray = np.reshape(imgArray, (288, 256))
+    plt.title("Fingerprint Image")
+    plt.imshow(imgArray)
+    plt.show(block=False)
+    print("Templating...")
+    if finger.image_2_tz(1) != adafruit_fingerprint.OK:
+        return False
+    print("Searching...")
+    if finger.finger_search() != adafruit_fingerprint.OK:
+        return False
+    return True
+
+
+# pylint: disable=too-many-statements
+def enroll_finger(location):
+    """Take a 2 finger images and template it, then store in 'location'"""
+    for fingerimg in range(1, 3):
+        if fingerimg == 1:
+            print("Place finger on sensor...", end="")
+        else:
+            print("Place same finger again...", end="")
+
+        while True:
+            i = finger.get_image()
+            if i == adafruit_fingerprint.OK:
+                print("Image taken")
+                break
+            if i == adafruit_fingerprint.NOFINGER:
+                print(".", end="")
+            elif i == adafruit_fingerprint.IMAGEFAIL:
+                print("Imaging error")
+                return False
+            else:
+                print("Other error")
+                return False
+
+        print("Templating...", end="")
+        i = finger.image_2_tz(fingerimg)
+        if i == adafruit_fingerprint.OK:
+            print("Templated")
+        else:
+            if i == adafruit_fingerprint.IMAGEMESS:
+                print("Image too messy")
+            elif i == adafruit_fingerprint.FEATUREFAIL:
+                print("Could not identify features")
+            elif i == adafruit_fingerprint.INVALIDIMAGE:
+                print("Image invalid")
+            else:
+                print("Other error")
+            return False
+
+        if fingerimg == 1:
+            print("Remove finger")
+            time.sleep(1)
+            while i != adafruit_fingerprint.NOFINGER:
+                i = finger.get_image()
+
+    print("Creating model...", end="")
+    i = finger.create_model()
+    if i == adafruit_fingerprint.OK:
+        print("Created")
+    else:
+        if i == adafruit_fingerprint.ENROLLMISMATCH:
+            print("Prints did not match")
+        else:
+            print("Other error")
+        return False
+
+    print("Storing model #%d..." % location, end="")
+    i = finger.store_model(location)
+    if i == adafruit_fingerprint.OK:
+        print("Stored")
+    else:
+        if i == adafruit_fingerprint.BADLOCATION:
+            print("Bad storage location")
+        elif i == adafruit_fingerprint.FLASHERR:
+            print("Flash storage error")
+        else:
+            print("Other error")
+        return False
+
+    return True
+
+
+##################################################
+
+
+def get_num():
+    """Use input() to get a valid number from 1 to 127. Retry till success!"""
+    i = 0
+    while (i > 127) or (i < 1):
+        try:
+            i = int(input("Enter ID # from 1-127: "))
+        except ValueError:
+            pass
+    return i
+
+
+while True:
+    print("----------------")
+    if finger.read_templates() != adafruit_fingerprint.OK:
+        raise RuntimeError("Failed to read templates")
+    print("Fingerprint templates:", finger.templates)
+    print("e) enroll print")
+    print("f) find print")
+    print("d) delete print")
+    print("v) view print")
+    print("p) preview and find print")
+    print("----------------")
+    c = input("> ")
+
+    if c == "e":
+        enroll_finger(get_num())
+    if c == "f":
+        if get_fingerprint():
+            print("Detected #", finger.finger_id, "with confidence", finger.confidence)
+        else:
+            print("Finger not found")
+    if c == "d":
+        if finger.delete_model(get_num()) == adafruit_fingerprint.OK:
+            print("Deleted!")
+        else:
+            print("Failed to delete")
+    if c == "v":
+        get_fingerprint_photo()
+    if c == "p":
+        if get_fingerprint_preview():
+            print("Detected #", finger.finger_id, "with confidence", finger.confidence)
+        else:
+            print("Finger not found")

optional_requirements.txt

@@ -1,3 +1,7 @@
 # SPDX-FileCopyrightText: 2022 Alec Delaney, for Adafruit Industries
 #
 # SPDX-License-Identifier: Unlicense
+
+numpy
+matplotlib
+pyserial