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/* * Copyright 2011 Robert Theis//from w ww . jav a 2 s . co m * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.sector67.nsaaway.ocr.complex; import org.sector67.nsaaway.R; import com.googlecode.leptonica.android.ReadFile; import com.googlecode.tesseract.android.TessBaseAPI; import android.graphics.Bitmap; import android.os.AsyncTask; import android.os.Handler; import android.os.Message; import android.util.Log; /** * Class to send OCR requests to the OCR engine in a separate thread, send a success/failure message, * and dismiss the indeterminate progress dialog box. Used for non-continuous mode OCR only. */ final class OcrRecognizeAsyncTask extends AsyncTask<Void, Void, Boolean> { // private static final boolean PERFORM_FISHER_THRESHOLDING = false; // private static final boolean PERFORM_OTSU_THRESHOLDING = false; // private static final boolean PERFORM_SOBEL_THRESHOLDING = false; private CaptureActivity activity; private TessBaseAPI baseApi; private byte[] data; private int width; private int height; private OcrResult ocrResult; private long timeRequired; OcrRecognizeAsyncTask(CaptureActivity activity, TessBaseAPI baseApi, byte[] data, int width, int height) { this.activity = activity; this.baseApi = baseApi; this.data = data; this.width = width; this.height = height; } @Override protected Boolean doInBackground(Void... arg0) { long start = System.currentTimeMillis(); Bitmap bitmap = activity.getCameraManager().buildLuminanceSource(data, width, height).renderCroppedGreyscaleBitmap(); String textResult; // if (PERFORM_FISHER_THRESHOLDING) { // Pix thresholdedImage = Thresholder.fisherAdaptiveThreshold(ReadFile.readBitmap(bitmap), 48, 48, 0.1F, 2.5F); // Log.e("OcrRecognizeAsyncTask", "thresholding completed. converting to bmp. size:" + bitmap.getWidth() + "x" + bitmap.getHeight()); // bitmap = WriteFile.writeBitmap(thresholdedImage); // } // if (PERFORM_OTSU_THRESHOLDING) { // Pix thresholdedImage = Binarize.otsuAdaptiveThreshold(ReadFile.readBitmap(bitmap), 48, 48, 9, 9, 0.1F); // Log.e("OcrRecognizeAsyncTask", "thresholding completed. converting to bmp. size:" + bitmap.getWidth() + "x" + bitmap.getHeight()); // bitmap = WriteFile.writeBitmap(thresholdedImage); // } // if (PERFORM_SOBEL_THRESHOLDING) { // Pix thresholdedImage = Thresholder.sobelEdgeThreshold(ReadFile.readBitmap(bitmap), 64); // Log.e("OcrRecognizeAsyncTask", "thresholding completed. converting to bmp. size:" + bitmap.getWidth() + "x" + bitmap.getHeight()); // bitmap = WriteFile.writeBitmap(thresholdedImage); // } try { baseApi.setImage(ReadFile.readBitmap(bitmap)); textResult = baseApi.getUTF8Text(); timeRequired = System.currentTimeMillis() - start; // Check for failure to recognize text if (textResult == null || textResult.equals("")) { return false; } ocrResult = new OcrResult(); ocrResult.setWordConfidences(baseApi.wordConfidences()); ocrResult.setMeanConfidence( baseApi.meanConfidence()); ocrResult.setRegionBoundingBoxes(baseApi.getRegions().getBoxRects()); ocrResult.setTextlineBoundingBoxes(baseApi.getTextlines().getBoxRects()); ocrResult.setWordBoundingBoxes(baseApi.getWords().getBoxRects()); ocrResult.setStripBoundingBoxes(baseApi.getStrips().getBoxRects()); //ocrResult.setCharacterBoundingBoxes(baseApi.getCharacters().getBoxRects()); } catch (RuntimeException e) { Log.e("OcrRecognizeAsyncTask", "Caught RuntimeException in request to Tesseract. Setting state to CONTINUOUS_STOPPED."); e.printStackTrace(); try { baseApi.clear(); activity.stopHandler(); } catch (NullPointerException e1) { // Continue } return false; } timeRequired = System.currentTimeMillis() - start; ocrResult.setBitmap(bitmap); ocrResult.setText(textResult); ocrResult.setRecognitionTimeRequired(timeRequired); return true; } @Override protected void onPostExecute(Boolean result) { super.onPostExecute(result); Handler handler = activity.getHandler(); if (handler != null) { // Send results for single-shot mode recognition. if (result) { Message message = Message.obtain(handler, R.id.ocr_decode_succeeded, ocrResult); message.sendToTarget(); } else { Message message = Message.obtain(handler, R.id.ocr_decode_failed, ocrResult); message.sendToTarget(); } activity.getProgressDialog().dismiss(); } if (baseApi != null) { baseApi.clear(); } } }