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73 lines
2.3 KiB
Python
73 lines
2.3 KiB
Python
# Face Tracking Example
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#
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# This example shows off using the keypoints feature of your OpenMV Cam to track
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# a face after it has been detected by a Haar Cascade. The first part of this
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# script finds a face in the image using the frontalface Haar Cascade.
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# After which the script uses the keypoints feature to automatically learn your
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# face and track it. Keypoints can be used to automatically track anything.
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import sensor, time, image
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# Reset sensor
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sensor.reset()
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# Sensor settings
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sensor.set_contrast(1)
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sensor.set_gainceiling(16)
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sensor.set_framesize(sensor.QQVGA)
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sensor.set_pixformat(sensor.GRAYSCALE)
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# Skip a few frames to allow the sensor settle down
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# Note: This takes more time when exec from the IDE.
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for i in range(0, 10):
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img = sensor.snapshot()
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img.draw_string(0, 0, "Please wait...")
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# Load Haar Cascade
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# By default this will use all stages, lower satges is faster but less accurate.
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face_cascade = image.HaarCascade("frontalface", stages=25)
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print(face_cascade)
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# First set of keypoints
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kpts1 = None
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# Find a face!
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while (kpts1 == None):
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img = sensor.snapshot()
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img.draw_string(0, 0, "Looking for a face...")
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# Find faces
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objects = img.find_features(face_cascade, threshold=0.5, scale=1.5)
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if objects:
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# Expand the ROI by 31 pixels in every direction
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face = (objects[0][0]-31, objects[0][1]-31,objects[0][2]+31*2, objects[0][3]+31*2)
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# Extract keypoints using the detect face size as the ROI
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kpts1 = img.find_keypoints(scale_factor=1.2, max_keypoints=100, roi=face)
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# Draw a rectangle around the first face
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img.draw_rectangle(objects[0])
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# Draw keypoints
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print(kpts1)
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img.draw_keypoints(kpts1, size=12)
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time.sleep(1000)
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# FPS clock
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clock = time.clock()
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while (True):
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clock.tick()
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img = sensor.snapshot()
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# Extract keypoints using the detect face size as the ROI
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kpts2 = img.find_keypoints(scale_factor=1.2, max_keypoints=100)
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if (kpts2):
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# Match the first set of keypoints with the second one
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c=image.match_descriptor(kpts1, kpts2)
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match = c[6] # C[6] contains the number of matches.
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if (match>5):
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img.draw_rectangle(c[2:6])
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img.draw_cross(c[0], c[1], size=10)
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print(kpts2, "matched:%d dt:%d"%(match, c[7]))
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# Draw FPS
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img.draw_string(0, 0, "FPS:%.2f"%(clock.fps()))
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