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On Valentine's day, I drew an object with characters!

2022-07-27 08:14:00 【51CTO】

Before, I often saw that kind of video composed of characters on the Internet , Very cool . I don't know how to do it , I've studied these two days , It's not hard to find .

Let's take a look at the final effect （ If vague , Click the link below to see the HD version ）：

https://bytedance.feishu.cn/docx/doxcnCvvY051xFCBAmSqYZgiP7b

How to achieve ？

Simply speaking , To turn a color video into a black-and-white video drawn by characters , You can do it in the following steps ：

Frame the original video , Black and white every frame , And the pixels are represented by corresponding characters .
Recombine the represented string into a character image .
Combine all the character images into character video .
Import the audio of the original video into the new character video .

Operation method

I put the complete code at the end of the article , Direct operation python3 video2char.py that will do . The program will ask you to enter the local path of the video and the definition after the transformation （0 Most blurred ,1 The clearest . Of course, the clearer , The slower the transition ）.

To run the code, you need to use tqdm、opencv_python、moviepy Wait for a few libraries , First of all pip3 install Make sure they all have .

Principle analysis

The key step is how to convert a color image into a black-and-white character image , As shown in the figure below ：

Valentine's Day , I drew an object with characters ！_opencv

Extracted from the Frog Princess video

Valentine's Day , I drew an object with characters ！_opencv_02

Drawn in characters

The principle of transformation is actually very simple . First of all, because a character will occupy a large pixel block in the image , So we must compress the color image first , Successive blocks of pixels can be merged , This compression process is opencv Of resize operation .

Then convert the compressed pixels into black-and-white pixels , And transform it into the corresponding character . Character, I use the following string here , From black to white , After my practice, this group is the best ：

"#8XOHLTI)i=+;:,. "

Then you need to paint the transformed characters on the new canvas , It should be noted that the layout is uniform and compact , It's best not to have too much extra space around the canvas .

Finally, combine all the character images into a video , But there is no sound after the merger , Need to use moviepy The library imports the sound of the original video .

Complete code

       
       import 
       
       os
       
       import 
       
       re
       
       import 
       
       shutil
       
       from 
       
       tqdm 
       
       import 
       
       trange, 
       
       tqdm
       
       import 
       
       cv2
       
       from 
       
       PIL 
       
       import 
       
       Image, 
       
       ImageFont, 
       
       ImageDraw
       
       from 
       
       moviepy.
       
       editor 
       
       import 
       
       VideoFileClip
       
       class 
       
       V2Char:
       
       font_path 
       
       = 
       
       "Arial.ttf"
       
       ascii_char 
       
       = 
       
       "#8XOHLTI)i=+;:,. "
       
       def 
       
       __init__(
       
       self, 
       
       video_path, 
       
       clarity):
       
       self.
       
       video_path 
       
       = 
       
       video_path
       
       self.
       
       clarity 
       
       = 
       
       clarity
       
       def 
       
       video2str(
       
       self):
       
       def 
       
       convert(
       
       img):
       
       if 
       
       img.
       
       shape[
       
       0] 
       
       > 
       
       self.
       
       text_size[
       
       1] 
       
       or 
       
       img.
       
       shape[
       
       1] 
       
       > 
       
       self.
       
       text_size[
       
       0]:
       
       img 
       
       = 
       
       cv2.
       
       resize(
       
       img, 
       
       self.
       
       text_size, 
       
       interpolation
       
       =
       
       cv2.
       
       INTER_NEAREST)
       
       ascii_frame 
       
       = 
       
       ""
       
       for 
       
       i 
       
       in 
       
       range(
       
       img.
       
       shape[
       
       0]):
       
       for 
       
       j 
       
       in 
       
       range(
       
       img.
       
       shape[
       
       1]):
       
       ascii_frame 
       
       += 
       
       self.
       
       ascii_char[
       
       int(
       
       img[
       
       i, 
       
       j] 
       
       / 
       
       256 
       
       * 
       
       len(
       
       self.
       
       ascii_char))
       
                    ]
       
       return 
       
       ascii_frame
       
       print(
       
       " Converting the original video to characters ...")
       
       self.
       
       char_video 
       
       = []
       
       cap 
       
       = 
       
       cv2.
       
       VideoCapture(
       
       self.
       
       video_path)
       
       self.
       
       fps 
       
       = 
       
       cap.
       
       get(
       
       cv2.
       
       CAP_PROP_FPS)
       
       self.
       
       nframe 
       
       = 
       
       int(
       
       cap.
       
       get(
       
       cv2.
       
       CAP_PROP_FRAME_COUNT))
       
       self.
       
       raw_width 
       
       = 
       
       int(
       
       cap.
       
       get(
       
       cv2.
       
       CAP_PROP_FRAME_WIDTH))
       
       self.
       
       raw_height 
       
       = 
       
       int(
       
       cap.
       
       get(
       
       cv2.
       
       CAP_PROP_FRAME_HEIGHT))
       
       font_size 
       
       = 
       
       int(
       
       25 
       
       - 
       
       20 
       
       * 
       
       max(
       
       min(
       
       float(
       
       self.
       
       clarity), 
       
       1), 
       
       0))
       
       self.
       
       font 
       
       = 
       
       ImageFont.
       
       truetype(
       
       self.
       
       font_path, 
       
       font_size)
       
       self.
       
       char_width, 
       
       self.
       
       char_height 
       
       = 
       
       max(
       
            [
       
       self.
       
       font.
       
       getsize(
       
       c) 
       
       for 
       
       c 
       
       in 
       
       self.
       
       ascii_char]
       
        )
       
       self.
       
       text_size 
       
       = (
       
       int(
       
       self.
       
       raw_width 
       
       / 
       
       self.
       
       char_width),
       
       int(
       
       self.
       
       raw_height 
       
       / 
       
       self.
       
       char_height),
       
        )
       
       for 
       
       _ 
       
       in 
       
       trange(
       
       self.
       
       nframe):
       
       raw_frame 
       
       = 
       
       cv2.
       
       cvtColor(
       
       cap.
       
       read()[
       
       1], 
       
       cv2.
       
       COLOR_BGR2GRAY)
       
       frame 
       
       = 
       
       convert(
       
       raw_frame)
       
       self.
       
       char_video.
       
       append(
       
       frame)
       
       cap.
       
       release()
       
       def 
       
       str2fig(
       
       self):
       
       print(
       
       " Generating character image ...")
       
       col, 
       
       row 
       
       = 
       
       self.
       
       text_size
       
       catalog 
       
       = 
       
       self.
       
       video_path.
       
       split(
       
       ".")[
       
       0]
       
       if 
       
       not 
       
       os.
       
       path.
       
       exists(
       
       catalog):
       
       os.
       
       makedirs(
       
       catalog)
       
       blank_width 
       
       = 
       
       int((
       
       self.
       
       raw_width 
       
       - 
       
       self.
       
       text_size[
       
       0] 
       
       * 
       
       self.
       
       char_width) 
       
       / 
       
       2)
       
       blank_height 
       
       = 
       
       int((
       
       self.
       
       raw_height 
       
       - 
       
       self.
       
       text_size[
       
       1] 
       
       * 
       
       self.
       
       char_height) 
       
       / 
       
       2)
       
       for 
       
       p_id 
       
       in 
       
       trange(
       
       len(
       
       self.
       
       char_video)):
       
       strs 
       
       = [
       
       self.
       
       char_video[
       
       p_id][
       
       i 
       
       * 
       
       col : (
       
       i 
       
       + 
       
       1) 
       
       * 
       
       col] 
       
       for 
       
       i 
       
       in 
       
       range(
       
       row)]
       
       im 
       
       = 
       
       Image.
       
       new(
       
       "RGB", (
       
       self.
       
       raw_width, 
       
       self.
       
       raw_height), (
       
       255, 
       
       255, 
       
       255))
       
       dr 
       
       = 
       
       ImageDraw.
       
       Draw(
       
       im)
       
       for 
       
       i, 
       
       str 
       
       in 
       
       enumerate(
       
       strs):
       
       for 
       
       j 
       
       in 
       
       range(
       
       len(
       
       str)):
       
       dr.
       
       text(
       
                        (
       
       blank_width 
       
       + 
       
       j 
       
       * 
       
       self.
       
       char_width,
       
       blank_height 
       
       + 
       
       i 
       
       * 
       
       self.
       
       char_height,
       
                        ),
       
       str[
       
       j],
       
       font
       
       =
       
       self.
       
       font,
       
       fill
       
       =
       
       "#000000",
       
                    )
       
       im.
       
       save(
       
       catalog 
       
       + 
       
       r"/pic_{}.jpg".
       
       format(
       
       p_id))
       
       def 
       
       jpg2video(
       
       self):
       
       print(
       
       " Synthesizing character images into character video ...")
       
       catalog 
       
       = 
       
       self.
       
       video_path.
       
       split(
       
       ".")[
       
       0]
       
       images 
       
       = 
       
       os.
       
       listdir(
       
       catalog)
       
       images.
       
       sort(
       
       key
       
       =
       
       lambda 
       
       x: 
       
       int(
       
       re.
       
       findall(
       
       r"\d+", 
       
       x)[
       
       0]))
       
       im 
       
       = 
       
       Image.
       
       open(
       
       catalog 
       
       + 
       
       "/" 
       
       + 
       
       images[
       
       0])
       
       fourcc 
       
       = 
       
       cv2.
       
       VideoWriter_fourcc(
       
       "m", 
       
       "p", 
       
       "4", 
       
       "v")
       
       savedname 
       
       = 
       
       catalog.
       
       split(
       
       "/")[
       
       -
       
       1]
       
       vw 
       
       = 
       
       cv2.
       
       VideoWriter(
       
       savedname 
       
       + 
       
       "_tmp.mp4", 
       
       fourcc, 
       
       self.
       
       fps, 
       
       im.
       
       size)
       
       for 
       
       image 
       
       in 
       
       tqdm(
       
       images):
       
       frame 
       
       = 
       
       cv2.
       
       imread(
       
       catalog 
       
       + 
       
       "/" 
       
       + 
       
       image)
       
       vw.
       
       write(
       
       frame)
       
       vw.
       
       release()
       
       shutil.
       
       rmtree(
       
       catalog)
       
       def 
       
       merge_audio(
       
       self):
       
       print(
       
       " Synthesizing audio into character video ...")
       
       raw_video 
       
       = 
       
       VideoFileClip(
       
       self.
       
       video_path)
       
       char_video 
       
       = 
       
       VideoFileClip(
       
       self.
       
       video_path.
       
       split(
       
       ".")[
       
       0] 
       
       + 
       
       "_tmp.mp4")
       
       audio 
       
       = 
       
       raw_video.
       
       audio
       
       video 
       
       = 
       
       char_video.
       
       set_audio(
       
       audio)
       
       video.
       
       write_videofile(
       
       self.
       
       video_path.
       
       split(
       
       ".")[
       
       0] 
       
       + 
       
       f"_{
       
       self.
       
       clarity}
       
       .mp4",
       
       codec
       
       =
       
       "libx264",
       
       audio_codec
       
       =
       
       "aac",
       
        )
       
       os.
       
       remove(
       
       self.
       
       video_path.
       
       split(
       
       ".")[
       
       0] 
       
       + 
       
       "_tmp.mp4")
       
       def 
       
       gen_video(
       
       self):
       
       self.
       
       video2str()
       
       self.
       
       str2fig()
       
       self.
       
       jpg2video()
       
       self.
       
       merge_audio()
       
       if 
       
       __name__ 
       
       == 
       
       "__main__":
       
       video_path 
       
       = 
       
       input(
       
       " Enter the path of the video file :\n")
       
       clarity 
       
       = 
       
       input(
       
       " Input definition (0~1,  Direct enter uses the default value 0):\n") 
       
       or 
       
       0
       
       v2char 
       
       = 
       
       V2Char(
       
       video_path, 
       
       clarity)
       
       v2char.
       
       gen_video()
      
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