How to make Mat in opencv python

newMat_3ch = np.zeros((rows, cols, 3), dtype = "uint8") #3channel

newMat_1ch = np.zeros((rows, cols), dtype = "uint8") #1channel

Mat is just numpy array.

python get file list in directory

from os import listdir

from os.path import isfile, join

mypath = "./customer_sample"

onlyfiles = [f for f in listdir(mypath) if isfile(join(mypath, f))]

print(onlyfiles)

result
['._s1.pdf', 's2.pdf', '._s2.pdf', '._s7.pdf', 's8.pdf', '._s8.pdf', '._s9.pdf', 's10.pdf', '._s10.pdf', 's1_p0.jpg', 's9.pdf', '._s1_p0.jpg', '._s4.pdf', 's5.pdf', '._s5.pdf', 's6.pdf', '._s6.pdf', 's7.pdf', '._s3.pdf', 's4.pdf', 's2_p0.jpg', 's2_p1.jpg', 's3_p0.jpg', 's3.pdf', 's3_p1.jpg', 's3_p2.jpg', 's1.pdf', 's3_p3.jpg']

python 1 line code for N random number (tip)

Make 1~100 random integer as 10 loops

import random

myr = [random.randrange(1, 100) for _ in range(10)]

print(myr)

result
[9, 67, 32, 55, 79, 47, 86, 62, 95, 30]

Thank you. ^^