Python实现视频转换为字符画详解

>pip install ffmpeg
>ffmpeg  -i soup.flv -ss 00:02:10 -t 15 seg.mp4 -y

import imageio
import numpy as np
import matplotlib.pyplot as plt
video = imageio.get_reader('seg.mp4')
imgs = [np.mean(im,2) for im in video]
plt.imshow(imgs[30])
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[30],160)
plt.imshow(im)
plt.show()

pixels = "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)

plt.figure(figsize=(8,4.5))
plt.rcParams['font.sans-serif'] = 'SIMSUN'  #SIMSUN为宋体
plt.axis([0,10,0,10])
_ = plt.text(5, 5, txt, fontsize=6, linespacing=0.6,ha='center', va='center',wrap=True)
plt.gca().set_axis_off()
plt.show()

from matplotlib import animation
fig = plt.figure(figsize=(8,4.5))
plt.rcParams['font.sans-serif'] = 'SIMSUN'
ax = fig.add_subplot(xlim=(0,10),ylim=(0,10))
ax.set_axis_off()

text = ax.text(5, 5, txt, fontsize=6, linespacing=0.6,  ha='center', va='center',wrap=True)

def animate(im):
    text.set_text(im2txt(im))
    return [text]

imgs = [resizeImg(im,160) for im in imgs]

ani = animation.FuncAnimation(fig, animate, imgs[:200], interval=10, blit=True)

plt.show()