template_matching#
# Template Matching Example - Normalized Cross Correlation (NCC)
#
# This example shows off how to use the NCC feature of your CanMV Cam to match
# image patches to parts of an image... expect for extremely controlled enviorments
# 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 reamin to show
# that the functionality exists, but, in its current state is inadequate.
from media.camera import *
from media.display import *
from media.media import *
import time, os, gc, sys
from image import SEARCH_EX, SEARCH_DS
DISPLAY_WIDTH = ALIGN_UP(1920, 16)
DISPLAY_HEIGHT = 1080
SCALE = 4
DETECT_WIDTH = DISPLAY_WIDTH // SCALE
DETECT_HEIGHT = DISPLAY_HEIGHT // SCALE
def camera_init():
# use hdmi for display
display.init(LT9611_1920X1080_30FPS)
# config vb for osd layer
config = k_vb_config()
config.max_pool_cnt = 1
config.comm_pool[0].blk_size = 4*DISPLAY_WIDTH*DISPLAY_HEIGHT
config.comm_pool[0].blk_cnt = 1
config.comm_pool[0].mode = VB_REMAP_MODE_NOCACHE
# meida buffer config
media.buffer_config(config)
# init default sensor
camera.sensor_init(CAM_DEV_ID_0, CAM_DEFAULT_SENSOR)
# set chn0 output size
camera.set_outsize(CAM_DEV_ID_0, CAM_CHN_ID_0, DISPLAY_WIDTH, DISPLAY_HEIGHT)
# set chn0 output format
camera.set_outfmt(CAM_DEV_ID_0, CAM_CHN_ID_0, PIXEL_FORMAT_YUV_SEMIPLANAR_420)
# create meida source device
globals()["meida_source"] = media_device(CAMERA_MOD_ID, CAM_DEV_ID_0, CAM_CHN_ID_0)
# create meida sink device
globals()["meida_sink"] = media_device(DISPLAY_MOD_ID, DISPLAY_DEV_ID, DISPLAY_CHN_VIDEO1)
# create meida link
media.create_link(meida_source, meida_sink)
# set display plane with video channel
display.set_plane(0, 0, DISPLAY_WIDTH, DISPLAY_HEIGHT, PIXEL_FORMAT_YVU_PLANAR_420, DISPLAY_MIRROR_NONE, DISPLAY_CHN_VIDEO1)
# set chn1 output nv12
camera.set_outsize(CAM_DEV_ID_0, CAM_CHN_ID_1, DETECT_WIDTH, DETECT_HEIGHT)
camera.set_outfmt(CAM_DEV_ID_0, CAM_CHN_ID_1, PIXEL_FORMAT_YUV_SEMIPLANAR_420)
# media buffer init
media.buffer_init()
# request media buffer for osd image
globals()["buffer"] = media.request_buffer(4 * DISPLAY_WIDTH * DISPLAY_HEIGHT)
# start stream for camera device0
camera.start_stream(CAM_DEV_ID_0)
def camera_deinit():
# stop stream for camera device0
camera.stop_stream(CAM_DEV_ID_0)
# deinit display
display.deinit()
os.exitpoint(os.EXITPOINT_ENABLE_SLEEP)
time.sleep_ms(100)
# release media buffer
media.release_buffer(globals()["buffer"])
# destroy media link
media.destroy_link(globals()["meida_source"], globals()["meida_sink"])
# deinit media buffer
media.buffer_deinit()
def capture_picture():
# create image for drawing
draw_img = image.Image(DISPLAY_WIDTH, DISPLAY_HEIGHT, image.ARGB8888)
# create image for osd
buffer = globals()["buffer"]
osd_img = image.Image(DISPLAY_WIDTH, DISPLAY_HEIGHT, image.ARGB8888, alloc=image.ALLOC_VB, phyaddr=buffer.phys_addr, virtaddr=buffer.virt_addr, poolid=buffer.pool_id)
osd_img.clear()
osd_img.draw_string(0, 0, "Please wait...")
display.show_image(osd_img, 0, 0, DISPLAY_CHN_OSD0)
# Load template.
# Template should be a small (eg. 32x32 pixels) grayscale image.
# template = image.Image("/sd/template.bmp")
# template.to_grayscale()
template = image.Image(32, 32, image.GRAYSCALE)
template.draw_circle(16,16,16,color=(255,255,255),fill=True)
fps = time.clock()
while True:
fps.tick()
try:
os.exitpoint()
yuv420_img = camera.capture_image(CAM_DEV_ID_0, CAM_CHN_ID_1)
img = image.Image(yuv420_img.width(), yuv420_img.height(), image.GRAYSCALE, data=yuv420_img)
camera.release_image(CAM_DEV_ID_0, CAM_CHN_ID_1, yuv420_img)
draw_img.clear()
# 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, 0.50, step=4, search=SEARCH_EX) #, roi=(10, 0, 60, 60))
if r:
draw_img.draw_rectangle([v*SCALE for v in r],color=(255,0,0))
draw_img.copy_to(osd_img)
del img
gc.collect()
print(fps.fps())
except KeyboardInterrupt as e:
print("user stop: ", e)
break
except BaseException as e:
sys.print_exception(e)
break
def main():
os.exitpoint(os.EXITPOINT_ENABLE)
camera_is_init = False
try:
print("camera init")
camera_init()
camera_is_init = True
print("camera capture")
capture_picture()
except Exception as e:
sys.print_exception(e)
finally:
if camera_is_init:
print("camera deinit")
camera_deinit()
if __name__ == "__main__":
main()
具体接口使用请参考相关文档说明: