python图像学基础

一、列表
list(),int()都属于强制类型转化，将字符串转化为list列表
一维数组 a=[1 2 3 4 5 6]
a[4]=5
二维数组 b=[[1 2][3 4][5 6][7 8]]
b[1][1]=4
三维数组 c=[[[1 2][3 4]][[5 6][7 8]]]
c[1][1][1]=8
二、图像转字符画
目的：将图像转化按照列表格式输出

show_height=40#纵向打印字符数
show_width=40#横向打印字符数
ascii_char=list("[email protected]%8&WM#*oahkbdpqwmZO0QLCJUYXzcvunxrjft/\|()1{}[]?-_+~<>i!lI;:,\"^`'. ")
print(ascii_char[10])
#读取图片
pic=cv2.imread("E:/Literature/material/121398.jpg")
print(type(pic))
#<class 'numpy.ndarray'>
#图像灰度化
gray=pic[:,:,0]*0.2+pic[:,:,1]*0.7+pic[:,:,2]*0.1
print(gray)
print(len(gray))#长
print(len(gray[0]))#宽
pic_height,pic_width,pic_c=pic.shape
print(pic_height)
print(pic_width)
for i in range(show_height):
    y=int(i*pic_height/show_height)#获取真实图片上某个像素点的纵坐标
    text = ""
    for j in range(show_width):
        x = int(j * pic_width / show_width)  # 获取真实图片上某个像素点的横坐标
        text+=ascii_char[int(gray[y][x]/256*len(ascii_char))]
    print(text)

#结果
vvccvvvuvvvvvqcvvvvvcvvvvccccccvvvvvvvvv#每行四十的字符
uvvvuuuuuuvvuUXuvcvvvvvvcvccvcvvvvvvvvvv
uuuuuuuvuuuuv1fvvvvvvvvvvvcvvvvvvvvvvvuu
uunuuuuuuuuucYjuuuuuuuuuuuuvuuuuuuuuuuuv
nnnnnnnnnuuuucJunnuununuuuuucLuuunuunnun
xnnxnnnnnnqnJYuznxnnnnnunnnnQ_nnnuuunnnn
xxxxxxxxxxYxrcmx/xxxxxnnnnxnvvunnxnxxxxx
rrrrrrrrrr0cZxM{|rxxxxxxxxxxUz|xxrxxnxxx
jrjjrrrjjrkwJfOUUrnrrrrrrrrrLoz0rxrrxrrr
fjfjfjjjjqqUzaf*OoUjrjjjrrj10czLrrrrrrrr
ffffffffj*hU$Yjcr/cjjjjjjjrmnXxUxjjjjjjj
/[email protected]|jffffjrbtcvprjffjjff
///////tWq%0zU#mbkzYfttttf/pz%80btCftfff
\\\\\/\|b8WCXXr0mQXtt//tt\CqqptxZbuftttt
|||\|\|\hMCYUjnjjrct\/\/f\CdWpdrZQ*|/\\\
(((||||\QdkYXxfcnxv\\\\\l)ok$%cYOpkQ/\\|
))((((((mZbcYYmaL\c\||||-[email protected]\|||
11)))))(qQXXYY0uXfX((((urcYbWpznXUuz)(((
{{{11111mzUUUJcccnY11j/{|qbpMWYvOqvz()))
}{{{{{1{OUYOQXuz0uY)?twpXMqoLBXcXUZJ(111
}}}}}}}1OYm0Jz[t/tzJ)cX#[email protected]{{{
[[[[[[[[email protected]*z*p000zmatqJJXC{[}}
]]]][]]ZY|*%pj(txuJ)vh/fC.jtrLqZtx0n/[[[
-?????-ZO$QwzMZjjbobvXrf)xxuxbkn#fJxU}]]
------]8hWLZcr\[email protected]/0[??
_--_---wcOcQntJ(vnmcCc#8JOJYcUfCr08CdX--
___+[f/[email protected]\0CXrj0xJOckc_-
_+_~zLO0uuJYx\znr|wrUX\+qUJOrL0puUzvqr_-
|fCYJo#YxjXUqfXrx\QnC|\|Y}n/j\WujzxYmp~~
8cqB8/mOrOXYXbQc|{n0r1|(t\fn/tJn(uUmjZi~
XWmjY/qcoQYznr){rYr|txttuCXxzQZJf[{1/cq}
XQzUpCZzr?(Ltr))(/u/jxz0un(rftt\mvffbtU+
QadzLnaZ$0vJnWLut|Z|tOdJnxh%8&d)%&|(1jt>
0JCxM%zvWmvLnu|bjfznrjfx|nzf|tx}QjLnXQ/k
(YbjMUQvvmxOnfX[ttXfxjtva}<aY\QtCj/n|Lx)
UXXXkQUXcOnLnjujfjXxnrcj(0j[OQO/Yj)Qf0UJ
z!cYrcXcYLjJut*&*xjx/xC[\hba{bUnXfmUJLCc
v<vCjuCzzCrJxz--mcrn\[email protected]/xczXxf++Zxdr
v(uxxnJz([email protected]/f/XtfxwJQUrQt{$1v\Qj
cxzu}[email protected]@$jfXnuYUdQCZCCuv|u&*c)Of