Add performance example

Renumber logo detection example

Author: sfe-SparkFro

examples/ex05_performance.py

@@ -0,0 +1,69 @@
+#-------------------------------------------------------------------------------
+# SPDX-License-Identifier: MIT
+# 
+# Copyright (c) 2025 SparkFun Electronics
+#-------------------------------------------------------------------------------
+# ex05_performance.py
+# 
+# This example
+#-------------------------------------------------------------------------------
+
+# Import OpenCV and hardware initialization module
+import cv2 as cv
+from cv2_hardware_init import *
+
+# Import NumPy
+from ulab import numpy as np
+
+# Import time for frame rate calculation
+import time
+
+# Initialize a loop timer to calculate processing speed in FPS
+loop_time = time.ticks_us()
+
+# Open the camera
+camera.open()
+
+# The `read()` method of OpenCV camera drivers can optionally take an output
+# image as an argument. When it's not provided, the camera driver must allocate
+# a whole new image for the frame, which can be slow and waste memory. If the
+# image argument is provided, then the camera driver will write the data to the
+# provided image. The image must be a NumPy array with the same shape and data
+# type as the camera's
+success, frame = camera.read()
+
+# Prompt the user to press a key to continue
+print("Press any key to continue")
+
+# Loop to continuously read frames from the camera and display them
+while True:
+    # Read a frame from the camera
+    success, frame = camera.read()
+    if not success:
+        print("Failed to read frame from camera")
+        break
+
+    # Now we'll 
+
+    # It's a good idea to measure the frame rate of the main loop to see how
+    # fast the entire pipeline is running. This will include not only the
+    # processing steps, but also any overhead from the hardware drivers and
+    # other code. We can calculate the FPS with the loop timer and draw it on
+    # the frame for visualization
+    current_time = time.ticks_us()
+    fps = 1_000_000 / (current_time - loop_time)
+    loop_time = current_time
+    frame = cv.putText(frame, f"FPS: {fps:.2f}", (10, 30), cv.FONT_HERSHEY_SIMPLEX, 1, (0, 0, 255), 2)
+
+    # Display the frame
+    cv.imshow(display, frame)
+
+    # Check for key presses
+    key = cv.waitKey(1)
+
+    # If any key is pressed, exit the loop
+    if key != -1:
+        break
+
+# Release the camera
+camera.release()