2値画像をグラフィック液晶に反映可能な形式に変換する

convert_image_to_binary.py

#
#
#
import sys
from typing import List
import numpy as np
from PIL import Image

file_path = "/path/to/image.png"


def main() -> int:
    # 読み込んでnp配列に変換
    print("Load image...")
    image = np.array(Image.open(file_path))
    print(f"path: {file_path}\nsize: {image.shape}")

    # バイナリデータに変換
    print("Convert to binary...")
    image_data: List[bytes] = []
    for n_row in range(0, image.shape[1], 8):
        # 画像を縦8pxずつ分割
        image_part = image[n_row : n_row + 8]

        # 各行について 2^行 を乗じる (0行目は0/1、7行目は0/128となる)
        for n in range(8):
            image_part[n] *= 2**n

        # 縦に足す これにより縦方向のピクセル情報が00~FFに変換される
        image_part_compressed = 0xFF - np.sum(image_part, axis=0, dtype=np.uint8)
        image_data.append(image_part_compressed.tobytes())

        # ビジュアライズ
        for x in range(8):
            for y in range(48):
                print("@@" if image_part[x][y] else "  ", end="")
            print()

        for c in image_part_compressed:
            print(f"{c:02X}", end="")

        print("\n")

    # バイナリからCのソースを出力する
    print("Export image data to file...")
    with open("image.c", "w") as dest:
        dest.write(f"const uint8_t image[{len(image_data)}][{len(image_data[0])}] = {{\n")
        image_data_str = [", ".join([f"0x{n:02X}" for n in line]) for line in image_data]
        for line in image_data_str:
            dest.write(f"    {{{line}}},\n")
        dest.write("};\n")

    return 0


if __name__ == "__main__":
    sys.exit(main())