问题解决了，就是模板的这个内存太大了，需要减小内存

回复: [模# This work is licensed under the MIT license.

Copyright (c) 2013-2023 OpenMV LLC. All rights reserved.

https://github.com/openmv/openmv/blob/master/LICENSE

Template Matching Example - Normalized Cross Correlation (NCC)

This example shows off how to use the NCC feature of your OpenMV Cam to match

image patches to parts of an image... expect for extremely controlled environments

NCC is not all to useful.

WARNING: NCC supports needs to be reworked! As of right now this feature needs

a lot of work to be made into somethin useful. This script will remain to show

that the functionality exists, but, in its current state is inadequate.

import time
import sensor
import image
from image import SEARCH_EX

from image import SEARCH_DS

Reset sensor

sensor.reset()

Set sensor settings

sensor.set_contrast(1)
sensor.set_gainceiling(16)

Max resolution for template matching with SEARCH_EX is QQVGA

sensor.set_framesize(sensor.QQVGA)

You can set windowing to reduce the search image.

sensor.set_windowing(((640-80)//2, (480-60)//2, 80, 60))

sensor.set_pixformat(sensor.GRAYSCALE)

Load template.

Template should be a small (eg. 32x32 pixels) grayscale image.

template = image.Image("4.pgm")

clock = time.clock()

Run template matching

while True:
clock.tick()
img = sensor.snapshot()

# find_template(template, threshold, [roi, step, search])
# ROI: The region of interest tuple (x, y, w, h).
# Step: The loop step used (y+=step, x+=step) use a bigger step to make it faster.
# Search is either image.SEARCH_EX for exhaustive search or image.SEARCH_DS for diamond search
#
# Note1: ROI has to be smaller than the image and bigger than the template.
# Note2: In diamond search, step and ROI are both ignored.
r = img.find_template(
    template, 0.70, step=4, search=SEARCH_EX
)  # , roi=(10, 0, 60, 60))
if r:
    img.draw_rectangle(r)

print(clock.fps())

板匹配显示内存分配失败是怎么回事？](/topic/7966/模板匹配显示内存分配失败是怎么回事)
Traceback (most recent call last):
File "", line 36, in
MemoryError: memory allocation failed, allocating 12192799 bytes
OpenMV v4.6.20; MicroPython v1.24.62; OPENMV4 with STM32H743
Type "help()" for more information.

@43sc 在 我看之前的那个我openmv的P4引脚连usb转ttl串口模块的tx，P5连rx，为啥没有反应呢？ 中说：
而且我的openmv那个灯没有亮，好像没有发送数据