// Scan the photo for text using the tess-two API
public static String scanPhoto(Bitmap bitmap) {
TessBaseAPI baseApi = new TessBaseAPI();
baseApi.setDebug(true);
baseApi.init(DATA_PATH, lang);
// set the black list
baseApi.setVariable("tessedit_char_blacklist", "':;,.?/\\}][{!@#$%^&*()-_=+~");
baseApi.setVariable("save_blob_choices", "T");
baseApi.setImage(bitmap);
String recognizedText = baseApi.getUTF8Text();
// Iterate over the results and print confidence values for debugging purposes
final ResultIterator iterator = baseApi.getResultIterator();
String lastUTF8Text;
float lastConfidence;
iterator.begin();
do {
lastUTF8Text = iterator.getUTF8Text(PageIteratorLevel.RIL_WORD);
lastConfidence = iterator.confidence(PageIteratorLevel.RIL_WORD);
if (lastConfidence > 50) {
Log.d(TAG, String.format("%s => %.2f", lastUTF8Text, lastConfidence));
}
} while (iterator.next(PageIteratorLevel.RIL_WORD));
baseApi.end();
Log.d(TAG, recognizedText);
return recognizedText;
}
@SmallTest
public void testSetRectangle() {
// Attempt to initialize the API.
final TessBaseAPI baseApi = new TessBaseAPI();
baseApi.init(TESSBASE_PATH, DEFAULT_LANGUAGE);
baseApi.setPageSegMode(TessBaseAPI.PageSegMode.PSM_SINGLE_CHAR);
final int width = 640;
final int height = 480;
final Bitmap bmp = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
final Paint paint = new Paint();
final Canvas canvas = new Canvas(bmp);
canvas.drawColor(Color.WHITE);
paint.setColor(Color.BLACK);
paint.setStyle(Style.FILL);
paint.setAntiAlias(true);
paint.setTextAlign(Align.CENTER);
paint.setTextSize(32.0f);
// Draw separate text on the left and right halves of the image.
final String leftInput = "A";
final String rightInput = "B";
canvas.drawText(leftInput, width / 4, height / 2, paint);
canvas.drawText(rightInput, width * 3 / 4, height / 2, paint);
baseApi.setVariable(TessBaseAPI.VAR_CHAR_WHITELIST, leftInput + rightInput);
baseApi.setImage(bmp);
// Ensure the result is correct for a rectangle on the left half of the image.
Rect left = new Rect(0, 0, width / 2, height);
baseApi.setRectangle(left);
String leftResult = baseApi.getUTF8Text();
assertEquals("Found incorrect text.", leftInput, leftResult);
// Ensure the result is correct for a rectangle on the right half of the image.
Rect right = new Rect(width / 2, 0, width, height);
baseApi.setRectangle(right);
String rightResult = baseApi.getUTF8Text();
assertEquals("Found incorrect text.", rightInput, rightResult);
// Attempt to shut down the API.
baseApi.end();
bmp.recycle();
}
@SmallTest
public void testSetVariable() {
final String inputText = "hello";
final Bitmap bmp = getTextImage(inputText, 640, 480);
// Attempt to initialize the API.
final TessBaseAPI baseApi = new TessBaseAPI();
baseApi.init(TESSBASE_PATH, DEFAULT_LANGUAGE);
baseApi.setPageSegMode(TessBaseAPI.PageSegMode.PSM_SINGLE_LINE);
// Ensure that setting the blacklist variable works.
final String blacklistedCharacter = inputText.substring(1, 2);
baseApi.setVariable(TessBaseAPI.VAR_CHAR_BLACKLIST, blacklistedCharacter);
baseApi.setImage(bmp);
final String outputText = baseApi.getUTF8Text();
assertFalse("Found a blacklisted character.", outputText.contains(blacklistedCharacter));
// Attempt to shut down the API.
baseApi.end();
bmp.recycle();
}
@SmallTest
public void testChoiceIterator() {
final String inputText = "hello";
final Bitmap bmp = TessBaseAPITest.getTextImage(inputText, 640, 480);
// Attempt to initialize the API.
final TessBaseAPI baseApi = new TessBaseAPI();
baseApi.init(TessBaseAPITest.TESSBASE_PATH, TessBaseAPITest.DEFAULT_LANGUAGE);
baseApi.setPageSegMode(TessBaseAPI.PageSegMode.PSM_SINGLE_LINE);
baseApi.setVariable(TessBaseAPI.VAR_SAVE_BLOB_CHOICES, TessBaseAPI.VAR_TRUE);
// Ensure that text is recognized.
baseApi.setImage(bmp);
String recognizedText = baseApi.getUTF8Text();
assertTrue("No recognized text found.", recognizedText != null && !recognizedText.equals(""));
// Iterate through the results.
ResultIterator iterator = baseApi.getResultIterator();
List<Pair<String, Double>> choicesAndConfidences;
iterator.begin();
do {
choicesAndConfidences = iterator.getChoicesAndConfidence(PageIteratorLevel.RIL_SYMBOL);
assertNotNull("Invalid result.", choicesAndConfidences);
for (Pair<String, Double> choiceAndConfidence : choicesAndConfidences) {
String choice = choiceAndConfidence.first;
Double conf = choiceAndConfidence.second;
assertTrue("No choice value found.", choice != null && !choice.equals(""));
assertTrue("Found an incorrect confidence value.", conf >= 0 && conf <= 100);
}
} while (iterator.next(PageIteratorLevel.RIL_SYMBOL));
iterator.delete();
assertNotNull("No ChoiceIterator values found.", choicesAndConfidences);
// Attempt to shut down the API.
baseApi.end();
bmp.recycle();
}
@SmallTest
public void testProgressValues_setRectangle() {
class Notifier implements ProgressNotifier {
public boolean receivedProgress = false;
private Rect bounds;
public void reset(Rect bounds) {
this.bounds = bounds;
receivedProgress = false;
}
@Override
public void onProgressValues(ProgressValues progressValues) {
receivedProgress = true;
testProgressValues(progressValues, bounds);
}
}
final Notifier notifier = new Notifier();
final int width = 640;
final int height = 480;
final Bitmap bmp = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
final Paint paint = new Paint();
paint.setColor(Color.BLACK);
paint.setStyle(Style.FILL);
paint.setAntiAlias(true);
paint.setTextAlign(Align.CENTER);
paint.setTextSize(32.0f);
// Draw separate text on the left and right halves of the image.
final Canvas canvas = new Canvas(bmp);
canvas.drawColor(Color.WHITE);
final String leftInput = "A";
final String rightInput = "B";
canvas.drawText(leftInput, width / 4, height / 2, paint);
canvas.drawText(rightInput, width * 3 / 4, height / 2, paint);
// Attempt to initialize the API.
final TessBaseAPI baseApi = new TessBaseAPI(notifier);
baseApi.init(TESSBASE_PATH, DEFAULT_LANGUAGE);
baseApi.setPageSegMode(TessBaseAPI.PageSegMode.PSM_SINGLE_LINE);
baseApi.setVariable(TessBaseAPI.VAR_CHAR_WHITELIST, leftInput + rightInput);
baseApi.setImage(bmp);
// Attempt to restrict recognition to a sub-rectangle of the image.
final Rect left = new Rect(0, 0, width / 2, height);
baseApi.setRectangle(left);
notifier.reset(left);
// Ensure a progress callback is received.
baseApi.getHOCRText(0);
assertTrue(notifier.receivedProgress);
// Attempt to restrict recognition to a sub-rectangle of the image.
final Rect right = new Rect(width / 2 + 5, 7, width - 5, height - 7);
baseApi.setRectangle(right);
notifier.reset(right);
// Ensure a progress callback is received.
baseApi.getHOCRText(0);
assertTrue(notifier.receivedProgress);
// Attempt to shut down the API.
baseApi.end();
bmp.recycle();
}
