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    <p>Why not just compare glyphs with something like this?</p> <pre><code>package similarglyphcharacterdetector; import java.awt.Color; import java.awt.Font; import java.awt.Graphics2D; import java.awt.Rectangle; import java.awt.font.FontRenderContext; import java.awt.image.BufferedImage; import java.util.HashMap; import java.util.LinkedHashMap; import java.util.Map; public class SimilarGlyphCharacterDetector { static char[] TEST_CHARS = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890".toCharArray(); static BufferedImage[] SAMPLES = null; public static BufferedImage drawGlyph(Font font, String string) { FontRenderContext frc = ((Graphics2D) new BufferedImage(1, 1, BufferedImage.TYPE_BYTE_GRAY).getGraphics()).getFontRenderContext(); Rectangle r= font.getMaxCharBounds(frc).getBounds(); BufferedImage res = new BufferedImage(r.width, r.height, BufferedImage.TYPE_BYTE_GRAY); Graphics2D g = (Graphics2D) res.getGraphics(); g.setBackground(Color.WHITE); g.fillRect(0, 0, r.width, r.height); g.setPaint(Color.BLACK); g.setFont(font); g.drawString(string, 0, r.height - font.getLineMetrics(string, g.getFontRenderContext()).getDescent()); return res; } private static void drawSamples(Font f) { SAMPLES = new BufferedImage[TEST_CHARS.length]; for (int i = 0; i &lt; TEST_CHARS.length; i++) SAMPLES[i] = drawGlyph(f, String.valueOf(TEST_CHARS[i])); } private static int compareImages(BufferedImage img1, BufferedImage img2) { if (img1.getWidth() != img2.getWidth() || img1.getHeight() != img2.getHeight()) throw new IllegalArgumentException(); int d = 0; for (int y = 0; y &lt; img1.getHeight(); y++) { for (int x = 0; x &lt; img1.getWidth(); x++) { if (img1.getRGB(x, y) != img2.getRGB(x, y)) d++; } } return d; } private static int nearestSampleIndex(BufferedImage image, int maxDistance) { int best = Integer.MAX_VALUE; int bestIdx = -1; for (int i = 0; i &lt; SAMPLES.length; i++) { int diff = compareImages(image, SAMPLES[i]); if (diff &lt; best) { best = diff; bestIdx = i; } } if (best &gt; maxDistance) return -1; return bestIdx; } public static void main(String[] args) throws Exception { Font f = new Font("FreeMono", Font.PLAIN, 13); drawSamples(f); HashMap&lt;Character, StringBuilder&gt; res = new LinkedHashMap&lt;Character, StringBuilder&gt;(); for (char c : TEST_CHARS) res.put(c, new StringBuilder(String.valueOf(c))); int maxDistance = 5; for (int i = 0x80; i &lt;= 0xFFFF; i++) { char c = (char)i; if (f.canDisplay(c)) { int n = nearestSampleIndex(drawGlyph(f, String.valueOf(c)), maxDistance); if (n != -1) { char nc = TEST_CHARS[n]; res.get(nc).append(c); } } } for (Map.Entry&lt;Character, StringBuilder&gt; entry : res.entrySet()) if (entry.getValue().length() &gt; 1) System.out.println(entry.getValue()); } } </code></pre> <p>Output:</p> <pre><code>AÀÁÂÃÄÅĀĂĄǍǞȀȦΆΑΛАѦӒẠẢἈἉᾸᾹᾺᾼ₳Å BƁƂΒБВЬḂḄḆ CĆĈĊČƇΓЄГСὉℂⅭ ... </code></pre>
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    1. POFind characters that are similar glyphically in Unicode?
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