我有一堆来自iPhone的视频,正在尝试使用opencv编程获取它们的宽度和高度。下面是我的代码:
import os, glob
import cv2
ff = glob.glob("*.m??") + glob.glob("*.M??")
for f in ff:
cap = cv2.VideoCapture(f)
w, h = (int(cap.get(i)) for i in (3, 4))
cap.release()
print("%s: %dx%d" % (f, w, h))
问题是,结果总是相同的:
我有一个有3行的图,如下所示:
a = data.frame(time = c(1:100), x = rnorm(100))
b = data.frame(time = c(1:100), y = rnorm(100))
c = data.frame(time = c(1:100), z = rnorm(100))
plot(a$time, a$x, type = 'l')
lines(b$time, b$y, type = 'l')
lines(c$time, c$z, type = 'l')
我需要填充线条的最低值和最大值之间的区域,以便