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此例程为09-feature-Detection-edges.py
本例程的目标是利用canny算子实现快速边缘检测,使用canny算子的边缘检测是最简单最快速的边缘检测,但是检测的效果没有morph变换的边缘检测效果好。

# Edge detection with Canny:
#
# This example demonstrates the Canny edge detector.
import sensor, image, time

sensor.reset() # Initialize the camera sensor.
sensor.set_pixformat(sensor.GRAYSCALE) # or sensor.RGB565
sensor.set_framesize(sensor.QQVGA) # or sensor.QVGA (or others)
sensor.skip_frames(30) # Let new settings take affect.
sensor.set_gainceiling(8)

clock = time.clock() # Tracks FPS.
while(True):
    clock.tick() # Track elapsed milliseconds between snapshots().
    img = sensor.snapshot() # Take a picture and return the image.
    # Use Canny edge detector
    img.find_edges(image.EDGE_CANNY, threshold=(50, 80))
    #threshold设置阈值

    # Faster simpler edge detection
    #img.find_edges(image.EDGE_SIMPLE, threshold=(100, 255))
    print(clock.fps()) # Note: Your OpenMV Cam runs about half as fast while

原图:

使用canny算子的边缘检测:

使用04-image-Filters-edge_detection.py morph变换边缘检测