Find_hog on Nicla Vision

Arduino Boards
1

Hello,

I am trying to run the HOG feature extraction example from the OpenMV Examples on the Nicla Vision device.

Here the hog.py, it is quite simple:

import sensor, image, time

sensor.reset()
sensor.set_contrast(1)
sensor.set_gainceiling(8)
sensor.set_framesize(sensor.QVGA)
sensor.set_pixformat(sensor.GRAYSCALE)
sensor.skip_frames(time = 2000)

clock = time.clock() # Tracks FPS.
while (True):
    clock.tick()
    img = sensor.snapshot()
    img.find_hog()
    print(clock.fps())

But I am getting this error a the line where find_hog function is executed:

Traceback (most recent call last):
  File "<stdin>", line 22, in <module>
OSError: This function is unavailable on your OpenMV Cam.
MicroPython: v1.18-omv-r6 OpenMV: v4.3.1 HAL: v1.9.0 BOARD: NICLAV-STM32H747
Type "help()" for more information.
>>>

Documentation says that find_hog method is not available for OpenMV Cam M4 (docs), but Nicla Vision has a H7 core.

Am I missing something on the configuration?

Thanks in advance for your replies

2

It’s disabled for the Nicla. We can’t fit everything onto all cameras anymore sine the library is so big.

3

We might be able to re-enable in the future however. Alternatively, you can compile a custom firmware with the feature turned on. However, you will have to turn something else off.

1 Like
4

Clear. Thanks!