查找圆形图案中心坐标报错

e1hr

def main():
 global Bd_num
 sensor.reset()
 sensor.set_pixformat(sensor.GRAYSCALE)
 sensor.set_framesize(sensor.VGA)

 print("Initial exposure == %d" % sensor.get_exposure_us())
 print("db == %d" % sensor.get_gain_db())
 sensor.skip_frames(time = 500)

 sensor.set_auto_gain(False![0_1698112339282_捕获.PNG](https://fcdn.singtown.com/bccd10ae-cfa4-4438-8179-f86bc66a7530.PNG) )
 sensor.set_auto_whitebal(False)
 sensor.set_auto_exposure(False,exposure_us=2000)

# sensor.set_hmirror(True)
# sensor.set_vflip(True)
 sensor.skip_frames(time = 2000)
 clock = time.clock()  # Create a clock object to track the FPS.

 uart2 = pyb.UART(3)
 uart2.init(115200, bits=8, parity=None, stop=1,read_buf_len=500)

 
 while(True):
    clock.tick()                    # Update the FPS clock.
    img = sensor.snapshot()
    print("Initial exposure == %d" % sensor.get_exposure_us())
    print("db == %d" % sensor.get_gain_db())
    print(clock.fps(),sensor.get_rgb_gain_db())

    for c in img.find_circles(threshold = 3500, x_margin = 10, y_margin = 10, r_margin = 10,r_min = 2, r_max = 100, r_step = 2):
        img.draw_circle(c.x(), c.y(), c.r(), color = (255, 0, 0))
        print(c)

kidswong999

你得把完整的，可以直接运行出错的代码放上来。

e1hr

from pyb import UART
import sensor, image, time,pyb,struct
import json
import cpufreq

EXPOSURE_TIME_SCALE = 1.0


def main():

 sensor.reset()
 sensor.set_pixformat(sensor.GRAYSCALE)
 sensor.set_framesize(sensor.VGA)

 print("Initial exposure == %d" % sensor.get_exposure_us())
 print("db == %d" % sensor.get_gain_db())
 sensor.skip_frames(time = 500)

 sensor.set_auto_gain(False)
 sensor.set_auto_whitebal(False)
 sensor.set_auto_exposure(False,exposure_us=2000)

 sensor.skip_frames(time = 2000)#跳过多少毫秒的帧
 clock = time.clock()  # Create a clock object to track the FPS.


 uart2 = pyb.UART(3)
 uart2.init(115200, bits=8, parity=None, stop=1,read_buf_len=500)

 while(True):
    clock.tick()                    # Update the FPS clock.
    img = sensor.snapshot()
    print("Initial exposure == %d" % sensor.get_exposure_us())
    print("db == %d" % sensor.get_gain_db())
    print(clock.fps(),sensor.get_rgb_gain_db())

    for c in img.find_circles(threshold = 3500, x_margin = 10, y_margin = 10, r_margin = 10,r_min = 2, r_max = 100, r_step = 2):
       img.draw_circle(c.x(), c.y(), c.r(), color = (255, 0, 0))
       print(c)


main()

e1hr

kidswong999

OpenMV4 H7，find_circles不能用vga图像，因为内存太小了。

要么减小分辨率，要么换OpenMV4 H7 Plus。

e1hr

@kidswong999 请问用findcircles()函数是不是需要知道圆大概占多少像素？

kidswong999

https://book.openmv.cc/example/09-Feature-Detection/find-circles.html

r_min, r_max可以筛选圆的尺寸。