例程讲解10-Color-Tracking->ir_beacon_grayscale_trackingIR灰度跟踪

# IR灰度跟踪示例
#
# 这个例子展示了使用OpenMV Cam进行红外信标灰度跟踪。

import sensor, image, time

thresholds = (255, 255) # thresholds for bright white light from IR.

sensor.reset()
sensor.set_pixformat(sensor.GRAYSCALE)
sensor.set_framesize(sensor.VGA)
sensor.set_windowing((240, 240)) # 240x240 center pixels of VGA
sensor.skip_frames(time = 2000)
sensor.set_auto_gain(False) # must be turned off for color tracking
sensor.set_auto_whitebal(False) # must be turned off for color tracking
clock = time.clock()

# 只有比“pixel_threshold”多的像素和多于“area_threshold”的区域才被
# 下面的“find_blobs”返回。 如果更改相机分辨率，
# 请更改“pixels_threshold”和“area_threshold”。 “merge = True”合并图像中所有重叠的色块。

while(True):
    clock.tick()
    img = sensor.snapshot()
    for blob in img.find_blobs([thresholds], pixels_threshold=200, area_threshold=200, merge=True):
        ratio = blob.w() / blob.h()
        if (ratio >= 0.5) and (ratio <= 1.5): # filter out non-squarish blobs
            img.draw_rectangle(blob.rect())
            img.draw_cross(blob.cx(), blob.cy())
    print(clock.fps())

星瞳科技OpenMV官方中文文档函数讲解：