set_windowing：Frame size is not supported or is not set. it is strange

OpenMV Boards
1

image
image1040×676 38 KB

# Untitled - By: Administrator - Wed Mar 19 2025

import sensor
import time
my_roi          = (335,240,1270,678)
def sensor_set_gray():
    global my_roi
    sensor.reset()
    sensor.set_pixformat(sensor.GRAYSCALE)
    sensor.set_framesize(sensor.FHD)
    print(my_roi)    
    sensor.set_windowing(my_roi)

    sensor.set_auto_gain(True)
    sensor.set_auto_whitebal(True)

    sensor.set_auto_exposure(True)
    sensor.set_contrast(+1)
    sensor.skip_frames(time = 3000)
    return

clock = time.clock()
sensor_set_gray()
while True:
    clock.tick()
    img = sensor.snapshot()
    print(clock.fps())

(335, 240, 1270, 678)
Traceback (most recent call last):
File “”, line 23, in
File “”, line 19, in sensor_set_gray
RuntimeError: Frame size is not supported or is not set.
OpenMV v4.5.2-dirty; MicroPython v1.20-omv-r22-dirty; OPENMV4P-STM32H743
Type “help()” for more information.

2

It’s because of the crop. The DMA hardware needs certain rules on the file size of the image in pixels. That’s being violated because of the crop. Change your x offset by like 1-3 pixels.

1 Like
3

your means the size of cropping image is not random, it should be 2 times of number?

4

It has to pass all of this: openmv/src/omv/ports/stm32/omv_csi.c at master · openmv/openmv · GitHub

Otherwise, the DMA system would get stuck and crash.

5

i set my_roi = (340,240,1270,678),the code runs ok.