Java + Tesseract, 53 octets
Comme je n'ai pas Mathematica, j'ai décidé de plier un peu les règles et d' utiliser Tesseract pour faire l'OCR. J'ai écrit un programme qui rend "2014" en une image, en utilisant différentes polices, tailles et styles, et trouve la plus petite image reconnue comme "2014". Les résultats dépendent des polices disponibles.
Voici le gagnant sur mon ordinateur - 53 octets, utilisant la police "URW Gothic L":
Code:
import java.awt.Color;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics2D;
import java.awt.GraphicsEnvironment;
import java.awt.image.BufferedImage;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import javax.imageio.ImageIO;
public class Ocr {
public static boolean blankLine(final BufferedImage img, final int x1, final int y1, final int x2, final int y2) {
final int d = x2 - x1 + y2 - y1 + 1;
final int dx = (x2 - x1 + 1) / d;
final int dy = (y2 - y1 + 1) / d;
for (int i = 0, x = x1, y = y1; i < d; ++i, x += dx, y += dy) {
if (img.getRGB(x, y) != -1) {
return false;
}
}
return true;
}
public static BufferedImage trim(final BufferedImage img) {
int x1 = 0;
int y1 = 0;
int x2 = img.getWidth() - 1;
int y2 = img.getHeight() - 1;
while (x1 < x2 && blankLine(img, x1, y1, x1, y2)) x1++;
while (x1 < x2 && blankLine(img, x2, y1, x2, y2)) x2--;
while (y1 < y2 && blankLine(img, x1, y1, x2, y1)) y1++;
while (y1 < y2 && blankLine(img, x1, y2, x2, y2)) y2--;
return img.getSubimage(x1, y1, x2 - x1 + 1, y2 - y1 + 1);
}
public static int render(final Font font, final int w, final String name) throws IOException {
BufferedImage img = new BufferedImage(w, w, BufferedImage.TYPE_BYTE_BINARY);
Graphics2D g = img.createGraphics();
float size = font.getSize2D();
Font f = font;
while (true) {
final FontMetrics fm = g.getFontMetrics(f);
if (fm.stringWidth("2014") <= w) {
break;
}
size -= 0.5f;
f = f.deriveFont(size);
}
g = img.createGraphics();
g.setFont(f);
g.fillRect(0, 0, w, w);
g.setColor(Color.BLACK);
g.drawString("2014", 0, w - 1);
g.dispose();
img = trim(img);
final File file = new File(name);
ImageIO.write(img, "gif", file);
return (int) file.length();
}
public static boolean ocr() throws Exception {
Runtime.getRuntime().exec("/usr/bin/tesseract 2014.gif out -psm 8").waitFor();
String t = "";
final BufferedReader br = new BufferedReader(new FileReader("out.txt"));
while (true) {
final String s = br.readLine();
if (s == null) break;
t += s;
}
br.close();
return t.trim().equals("2014");
}
public static void main(final String... args) throws Exception {
int min = 10000;
for (String s : GraphicsEnvironment.getLocalGraphicsEnvironment().getAvailableFontFamilyNames()) {
for (int t = 0; t < 4; ++t) {
final Font font = new Font(s, t, 50);
for (int w = 10; w < 25; ++w) {
final int size = render(font, w, "2014.gif");
if (size < min && ocr()) {
render(font, w, "2014win.gif");
min = size;
System.out.println(s + ", " + size);
}
}
}
}
}
}