Finished work on the local binarizer and renamed it to HybridBinarizer. It uses the...

[zxing.git] / javase / src / com / google / zxing / client / j2se / ImageConverter.java

diff --git a/javase/src/com/google/zxing/client/j2se/ImageConverter.java b/javase/src/com/google/zxing/client/j2se/ImageConverter.java
index 180fcb7..538e59a 100644 (file)
--- a/javase/src/com/google/zxing/client/j2se/ImageConverter.java
+++ b/javase/src/com/google/zxing/client/j2se/ImageConverter.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2007 Google Inc.
+ * Copyright 2008 ZXing authors
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,37 +16,71 @@
 
 package com.google.zxing.client.j2se;
 
-import com.google.zxing.MonochromeBitmapSource;
+import com.google.zxing.BinaryBitmap;
+import com.google.zxing.LuminanceSource;
+import com.google.zxing.ReaderException;
+import com.google.zxing.common.BitArray;
+import com.google.zxing.common.BitMatrix;
+import com.google.zxing.common.HybridBinarizer;
 
-import javax.imageio.ImageIO;
 import java.awt.image.BufferedImage;
 import java.io.File;
 import java.io.IOException;
 import java.net.URI;
 
+import javax.imageio.ImageIO;
+
 /**
- * Utility application for evaluating the effectiveness of the
- * MonochromeBitmapSource. Given a set of images on the command line,
- * converts each to a black-and-white GIF. The result is placed in
- * a file based on the input name, with "_converted" appended.
+ * A utility application for evaluating the effectiveness of various thresholding algorithms.
+ * Given a set of images on the command line, it converts each to a black-and-white PNG.
+ * The result is placed in a file based on the input name, with either ".row.png" or ".2d.png"
+ * appended.
+ *
+ * TODO: Needs to be updated to accept different Binarizer implementations.
+ * TODO: Consider whether to keep this separate app, as CommandLineRunner has similar functionality.
  *
  * @author alasdair@google.com (Alasdair Mackintosh)
+ * @author dswitkin@google.com (Daniel Switkin)
  */
 public final class ImageConverter {
 
-  private static final String FORMAT = "gif";
+  private static final String FORMAT = "png";
   private static final int WHITE = 0xFFFFFFFF;
-  private static final int BLACK = 0x000000FF;
+  private static final int BLACK = 0xFF000000;
+  private static final int RED = 0xFFFF0000;
+  private static boolean rowSampling = false;
 
   private ImageConverter() {
   }
 
   public static void main(String[] args) throws Exception {
     for (String arg : args) {
+      if ("-row".equals(arg)) {
+        rowSampling = true;
+      } else if ("-2d".equals(arg)) {
+        rowSampling = false;
+      } else if (arg.startsWith("-")) {
+        System.err.println("Ignoring unrecognized option: " + arg);
+      }
+    }
+    for (String arg : args) {
+      if (arg.startsWith("-")) {
+        continue;
+      }
       File inputFile = new File(arg);
       if (inputFile.exists()) {
         if (inputFile.isDirectory()) {
           for (File input : inputFile.listFiles()) {
+            String filename = input.getName().toLowerCase();
+            // Skip hidden files and text files (the latter is found in the blackbox tests).
+            if (filename.startsWith(".") || filename.endsWith(".txt")) {
+              continue;
+            }
+            // Skip the results of dumping the black point.
+            if (filename.contains(".mono.png") || filename.contains(".row.png") ||
+                filename.contains(".2d.png")) {
+              continue;
+            }
             convertImage(input.toURI());
           }
         } else {
@@ -61,14 +95,40 @@ public final class ImageConverter {
 
   private static void convertImage(URI uri) throws IOException {
     BufferedImage image = ImageIO.read(uri.toURL());
-    MonochromeBitmapSource src = new BufferedImageMonochromeBitmapSource(image);
-    int width = src.getWidth();
-    int height = src.getHeight();
-
-    BufferedImage result = new BufferedImage(width, height, BufferedImage.TYPE_BYTE_BINARY);
-    for (int i = 0; i < width; i++) {
-      for (int j = 0; j < height; j++) {
-        result.setRGB(i, j, src.isBlack(i, j) ? BLACK : WHITE);
+    LuminanceSource source = new BufferedImageLuminanceSource(image);
+    BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
+    int width = bitmap.getWidth();
+    int height = bitmap.getHeight();
+
+    BufferedImage result = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
+    BitArray array = new BitArray(width);
+
+    if (rowSampling) {
+      for (int y = 0; y < height; y++) {
+          try {
+            array = bitmap.getBlackRow(y, array);
+          } catch (ReaderException e) {
+            // Draw rows with insufficient dynamic range in red
+            for (int x = 0; x < width; x++) {
+              result.setRGB(x, y, RED);
+            }
+            continue;
+          }
+
+        for (int x = 0; x < width; x++) {
+          result.setRGB(x, y, array.get(x) ? BLACK : WHITE);
+        }
+      }
+    } else {
+      try {
+        BitMatrix matrix = bitmap.getBlackMatrix();
+        for (int y = 0; y < height; y++) {
+          for (int x = 0; x < width; x++) {
+            result.setRGB(x, y, matrix.get(x, y) ? BLACK : WHITE);
+          }
+        }
+      } catch (ReaderException e) {
+
       }
     }
 
@@ -80,7 +140,8 @@ public final class ImageConverter {
   private static File getFileOfUri(URI uri) {
     String name = uri.getPath();
     int slashPos = name.lastIndexOf((int) '/');
-    String parent, basename;
+    String parent;
+    String basename;
     if (slashPos != -1 && slashPos != name.length() - 1) {
       parent = name.substring(0, slashPos);
       basename = name.substring(slashPos + 1);
@@ -111,7 +172,8 @@ public final class ImageConverter {
       if (dotpos != -1) {
         name = name.substring(0, dotpos);
       }
-      result = new File(name + "_converted." + FORMAT);
+      String suffix = rowSampling ? "row" : "2d";
+      result = new File(name + '.' + suffix + '.' + FORMAT);
     }
     return result;
   }