例子中的瞳孔识别不准确，有时识别不出来有时识别出来的只有一个眼睛

[fxv6]

# Iris Detection 2 Example
#
# This example shows how to find the eye gaze (pupil detection) after finding
# the eyes in an image. This script uses the find_eyes function which determines
# the center point of roi that should contain a pupil. It does this by basically
# finding the center of the darkest area in the eye roi which is the pupil center.
#
# Note: This script does not detect a face first, use it with the telephoto lens.

import sensor, time, image

# Reset sensor
sensor.reset()

# Sensor settings
sensor.set_contrast(3)
sensor.set_gainceiling(16)

# Set resolution to VGA.
sensor.set_framesize(sensor.VGA)

# Bin/Crop image to 200x100, which gives more details with less data to process
sensor.set_windowing((220, 190, 200, 100))

sensor.set_pixformat(sensor.GRAYSCALE)

# Load Haar Cascade
# By default this will use all stages, lower satges is faster but less accurate.
eyes_cascade = image.HaarCascade("eye", stages=24)
print(eyes_cascade)

# FPS clock
clock = time.clock()

while (True):
    clock.tick()
    # Capture snapshot
    img = sensor.snapshot()
    # Find eyes !
    # Note: Lower scale factor scales-down the image more and detects smaller objects.
    # Higher threshold results in a higher detection rate, with more false positives.
    eyes = img.find_features(eyes_cascade, threshold=0.5, scale_factor=1.5)

    # Find iris
    for e in eyes:
        iris = img.find_eye(e)
        img.draw_rectangle(e)
        img.draw_cross(iris[0], iris[1])

    # Print FPS.
    # Note: Actual FPS is higher, streaming the FB makes it slower.
    print(clock.fps())

[yuan]

例程讲解-08-face_eye_detection人眼追踪

可以试一下人眼追踪。

人眼追踪是先识别人脸，然后识别眼睛。
瞳孔追踪是先识别眼睛，然后寻找眼睛中颜色最深的部位确定为瞳孔，并且需要配合长焦镜头使用。