识别最近距离的小球
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一堆球中别最近距离的球，返回该球距离值，while之后出错，语法错误。不懂find_max(blobs)用法及含义，代码如下：
Measure the distance
This example shows off how to measure the distance through the size in imgage
This example in particular looks for yellow pingpong ball.
import sensor, image, time
For color tracking to work really well you should ideally be in a very, very,
very, controlled enviroment where the lighting is constant...
yellow_threshold = (39, 99, -61, 1, -80, -5)
You may need to tweak the above settings for tracking green things...
Select an area in the Framebuffer to copy the color settings.
sensor.reset() # Initialize the camera sensor.
sensor.set_pixformat(sensor.RGB565) # use RGB565.
sensor.set_framesize(sensor.QQVGA) # use QQVGA for speed.
sensor.skip_frames(10) # Let new settings take affect.
sensor.set_auto_whitebal(False) # turn this off.
clock = time.clock() # Tracks FPS.K=5000#the value should be measured
while(True):
clock.tick() # Track elapsed milliseconds between snapshots().
img = sensor.snapshot() # Take a picture and return the image.blobs = img.find_blobs([yellow_threshold])def find_max(blobs):
max_size=0
for b in blobs:
if b[2]*b[3] > max_size:
# Draw a rect around the blob.
img.draw_rectangle(b[0:4]) # rect
img.draw_cross(b[5], b[6]) # cx, cy
Lm = (b[2]+b[3])/2
length = K/Lm
print(length)
附：像find_max(blobs)这种函数是在哪里找和学习能？
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在图像中，没有最近的球，只有最大的色块, find_max(很多色块)会返回最大的色块。