调试人脸识别时出现问题，tuple' object has no attribute 'cx'该怎么解决？

[bsx3]

import sensor, image, time

from pid import PID
from pyb import Servo

pan_servo=Servo(1)
tilt_servo=Servo(2)

red_threshold  = (13, 49, 18, 61, 6, 47)

#pan_pid = PID(p=0.07, i=0, imax=90) #脱机运行或者禁用图像传输，使用这个PID
#tilt_pid = PID(p=0.05, i=0, imax=90) #脱机运行或者禁用图像传输，使用这个PID
pan_pid = PID(p=0.1, i=0, imax=90)#在线调试使用这个PID
tilt_pid = PID(p=0.1, i=0, imax=90)#在线调试使用这个PID

sensor.reset() # Initialize the camera sensor.

# Sensor settings
sensor.set_contrast(1)
sensor.set_gainceiling(16)
# HQVGA and GRAYSCALE are the best for face tracking.
sensor.set_framesize(sensor.HQVGA)
sensor.set_pixformat(sensor.GRAYSCALE)
#注意人脸识别只能用灰度图哦

clock = time.clock() # Tracks FPS.

face_cascade = image.HaarCascade("frontalface", stages=25)


def find_max(blobs):
    max_size=0
    for blob in blobs:
        if blob[2]*blob[3] > max_size:
            max_blob=blob
            max_size = blob[2]*blob[3]
    return max_blob





while(True):
    clock.tick() # Track elapsed milliseconds between snapshots().
    img = sensor.snapshot() # Take a picture and return the image.

    objects = img.find_features(face_cascade, threshold=0.75, scale=1.35)
    if objects:
        max_blob = find_max(objects)
        pan_error = max_blob.cx()-img.width()/2
        tilt_error = max_blob.cy()-img.height()/2

        print("pan_error: ", pan_error)

        img.draw_rectangle(max_blob.rect()) # rect

        pan_output=pan_pid.get_pid(pan_error,1)/2
        tilt_output=tilt_pid.get_pid(tilt_error,1)![0_1554463334443_1.png](https://fcdn.singtown.com/37df88e1-23ee-4635-9b52-c872527834f2.png) 
        print("pan_output",pan_output)
        pan_servo.angle(pan_servo.angle()+pan_output)
        tilt_servo.angle(tilt_servo.angle()-tilt_output)

[kidswong999]

https://docs.singtown.com/micropython/zh/latest/openmvcam/library/omv.image.html#image.find_features

find_features返回的是(x，y，w，h)的列表。

所以 max_blob.cx()改成
max_blob[0]+max_blob[2]/2

所以 max_blob.cy()改成
max_blob[1]+max_blob[3]/2

[bsx3]

谢谢，这个问题解决了。不过在人脸上画方框用到 img.draw_rectangle(max_blob.rect())时出现问题， img.find_features没有rect()的方法，该用哪个方法代替。

[kidswong999]

@bsx3 不同的问题单独发帖子。