通过python绘制华强买瓜的字符画视频的步骤详解

import imageio
import numpy as np
import matplotlib.pyplot as plt
video = imageio.get_reader('test.mp4')
imgs = []
for img in video:
    imgs.append(np.mean(img,2))
plt.imshow(imgs[0])
plt.show()

#将图像宽度缩小至width
from itertools import product   #用于循环嵌套
def resizeImg(img,w,h=None):
    m,n = img.shape
    if n<w:
        return img
    if not h:
        h = int(m*w/n)
    im = np.zeros([h,w])
    rw,rh = n/w,m/h         #缩放比例
    dw,dh = int(rw),int(rh) #取均值的步长
    for i,j in product(range(h),range(w)):
        I,J = int(i*rh),int(j*rw)
        im[i,j] = np.mean(img[I:I+dh,J:J+dw])
    return im
# 测试一下
im = resizeImg(imgs[0],160)
plt.imshow(im)
plt.show()

pixels = "▇圞國图囜ⒶⒷⒸB8&WMZO0QJX@%&jfoavunxr#t/\|()1{}[]?-_+~<>i!lI;:,\"^`'. ^`'. " #用于映射的字符
def im2txt(img):
    im = np.floor(img/255*len(pixels)).astype(int)
    txts = ""
    for line in im:
        txts += "".join([pixels[i] for i in line])
        txts += '\r\n'    #像素换行时文本也要换行
    return txts
#测试
txt = im2txt(im)
print(txt)

if __name__ == "__main__":
    video = imageio.get_reader('test.mp4')
    txts = []
    # 生成字符画
    for img in video:
        im = resizeImg(np.mean(img,2),120,30)
        txts.append(im2txt(im))

    # 初始化屏幕
    scr = curses.initscr()
    scr.timeout(40)     #每次等待键盘输入的时间为40ms
    #scr.
    for txt in cycle(txts):
        scr.addstr(0,0,txt)
        scr.border(0)
        scr.refresh()
        #curses.delay_output(25)
        if scr.getch()==27: #如果按下`esc`则退出`
            break