find_line_segments freezes

[beckmx]

Describe the bug
When using find_line_segments the output of the console gets freezed and looks like it doesnt have enough memory to continue, I havent received any core dump directly but I have to reboot to make it work again.

To Reproduce
Steps to reproduce the behavior:

#find non-infinite lines NOT WORKING
import sensor, image, lcd, time
lcd.init()
sensor.reset()
sensor.set_pixformat(sensor.RGB565) # grayscale is faster
sensor.set_framesize(sensor.QVGA)
sensor.set_windowing((224, 224))
sensor.run(1)
sensor.skip_frames(30)

tim = time.ticks_ms()
while(time.ticks_diff(time.ticks_ms(), tim)<30000):
    img = sensor.snapshot()
    for l in img.find_line_segments(merge_distance = 20, max_theta_diff = 25, roi=(80,60,160,120)):
        print("line-->")
    lcd.display(img)
print("finish")
lcd.clear()

Expected behavior
Lines should be able to be found

Actual behaviour
K210 freezes and stops sending image

Screenshots
If applicable, add screenshots to help explain your problem.

Please complete the following information

• IDE version: [0.2.5]
• Firmware version: [v0.6.2-84-g8fcd84a58]
• Board: [Maix Nano ]
• OS: [OSX]