Question

这种图像转换算法如何工作？

我想将位图转换为ascii位图任何人都可以帮我解决什么样的算法应该是我对编程的新手

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Answer 1

将图像转换为 ASCII 艺术

尺寸。假设一个字符的平均高度是其宽度的两倍，为了保持相同的比例，我们必须缩小原始图像。因此，使用等宽字体是有意义的。
颜色。我们可以根据字符的密度将像素的亮度转换为字符。因此，转换高对比度的灰度或黑白图像更准确。

原图：

Coding Horror

缩放后的 ASCII 图片：

<头>

scH=16, scW=8	scH=8, scW=4	scH=2, scW=1

class ImageToASCIIArt {
  public static void main(String[] args) throws IOException {
    char[][] chars = readImage("/tmp/image.jpg", 16, 8);
    writeToFile("/tmp/image.txt", chars);
  }

  static char[][] readImage(String path, int scH, int scW) throws IOException {
    BufferedImage image = ImageIO.read(new File(path));
    int height = image.getHeight() / scH;
    int width = image.getWidth() / scW;
    char[][] chars = new char[height][width];
    for (int i = 0; i < height; i++) {
      for (int j = 0; j < width; j++) {
        // scaling image and accumulating colors
        int colorRGB = 0;
        for (int k = 0; k < scH; k++)
          for (int p = 0; p < scW; p++)
            colorRGB += image.getRGB(j * scW + p, i * scH + k);
        // get the average color
        Color color = new Color(colorRGB / (scH * scW));
        // read the R, G, B values of the color and get the average brightness
        int brightness = (color.getRed()+color.getGreen()+color.getBlue()) / 3;
        // get a character depending on the brightness value
        chars[i][j] = getDensity(brightness);
      }
    }
    return chars;
  }

  static final String DENSITY =
      "@QB#NgWM8RDHdOKq9$6khEPXwmeZaoS2yjufF]}{tx1zv7lciL/\\|?*>r^;:_\"~,'.-`";

  static char getDensity(int value) {
    // Since we don't have 255 characters, we have to use percentages
    int charValue = (int) Math.round(DENSITY.length() / 255.0 * value);
    charValue = Math.max(charValue, 0);
    charValue = Math.min(charValue, DENSITY.length() - 1);
    return DENSITY.charAt(charValue);
  }

  static void writeToFile(String path, char[][] chars) throws IOException {
    FileWriter writer = new FileWriter(path);
    for (char[] row : chars) {
      String str = String.valueOf(row);
      writer.append(str).write("\n");
      System.out.println(str);
    }
    writer.flush();
    writer.close();
  }
}

^{另见：Restore an image from an ASCII art • Draw an ASCII art from an image}

Answer 2

这可以在Java中轻松完成，

    int width = 100;
    int height = 30;

    //BufferedImage image = ImageIO.read(new File("/logo.jpg"));
    BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
    Graphics g = image.getGraphics();
    g.setFont(new Font("SansSerif", Font.BOLD, 24));

    Graphics2D graphics = (Graphics2D) g;
    graphics.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING,
                RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
    graphics.drawString("JAVA", 10, 20);

    //save this image
    //ImageIO.write(image, "png", new File("/ascii-art.png"));

    for (int y = 0; y < height; y++) {
        StringBuilder sb = new StringBuilder();
        for (int x = 0; x < width; x++) {

            sb.append(image.getRGB(x, y) == -16777216 ? " " : "$");

        }

        if (sb.toString().trim().isEmpty()) {
            continue;
        }

        System.out.println(sb);
    }

原始来源：

Ascii Art - Java

android将位图转换为ascii位图

2 个答案:

将图像转换为 ASCII 艺术