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git-svn-id: https://zxing.googlecode.com/svn/trunk@280 59b500cc-1b3d-0410-9834-0bbf25fbcc57
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srowen
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/*
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* Copyright 2007 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.zxing.qrcode.detector;
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import com.google.zxing.MonochromeBitmapSource;
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import com.google.zxing.ReaderException;
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import com.google.zxing.common.BitMatrix;
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/**
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* @author srowen@google.com (Sean Owen)
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*/
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public final class DefaultGridSampler extends GridSampler {
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protected BitMatrix sampleGrid(MonochromeBitmapSource image,
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FinderPattern topLeft,
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FinderPattern topRight,
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FinderPattern bottomLeft,
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AlignmentPattern alignmentPattern,
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int dimension) throws ReaderException {
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float dimMinusThree = (float) dimension - 3.5f;
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float bottomRightX, bottomRightY;
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float sourceBottomRightX, sourceBottomRightY;
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if (alignmentPattern != null) {
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bottomRightX = alignmentPattern.getX();
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bottomRightY = alignmentPattern.getY();
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sourceBottomRightX = sourceBottomRightY = dimMinusThree - 3.0f;
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} else {
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// Don't have an alignment pattern, just make up the bottom-right point
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bottomRightX = (topRight.getX() - topLeft.getX()) + bottomLeft.getX();
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bottomRightY = (topRight.getY() - topLeft.getY()) + bottomLeft.getY();
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sourceBottomRightX = sourceBottomRightY = dimMinusThree;
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}
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PerspectiveTransform transform = PerspectiveTransform.quadrilateralToQuadrilateral(
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3.5f,
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3.5f,
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dimMinusThree,
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3.5f,
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sourceBottomRightX,
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sourceBottomRightY,
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3.5f,
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dimMinusThree,
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topLeft.getX(),
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topLeft.getY(),
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topRight.getX(),
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topRight.getY(),
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bottomRightX,
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bottomRightY,
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bottomLeft.getX(),
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bottomLeft.getY());
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BitMatrix bits = new BitMatrix(dimension);
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float[] points = new float[dimension << 1];
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for (int i = 0; i < dimension; i++) {
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int max = points.length;
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float iValue = (float) i + 0.5f;
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for (int j = 0; j < max; j += 2) {
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points[j] = (float) (j >> 1) + 0.5f;
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points[j + 1] = iValue;
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}
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transform.transformPoints(points);
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// Quick check to see if points transformed to something inside the image;
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// sufficent to check the endpoints
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checkEndpoint(image, points);
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for (int j = 0; j < max; j += 2) {
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if (image.isBlack((int) points[j], (int) points[j + 1])) {
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// Black(-ish) pixel
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bits.set(i, j >> 1);
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}
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}
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}
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return bits;
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}
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}
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/*
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* Copyright 2007 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.zxing.qrcode.detector;
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import com.google.zxing.MonochromeBitmapSource;
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import com.google.zxing.ReaderException;
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import com.google.zxing.common.BitMatrix;
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/**
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* Implementations of this class can, given locations of finder patterns for a QR code in an
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* image, sample the right points in the image to reconstruct the QR code, accounting for
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* perspective distortion. It is abstracted since it is relatively expensive and should be allowed
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* to take advantage of platform-specific optimized implementations, like Sun's Java Advanced
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* Imaging library, but which may not be available in other environments such as J2ME, and vice
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* versa.
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*
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* The implementation used can be controlled by calling {@link #setGridSampler(GridSampler)}
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* with an instance of a class which implements this interface.
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*
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* @author srowen@google.com (Sean Owen)
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*/
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public abstract class GridSampler {
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private static GridSampler gridSampler;
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/**
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* Sets the implementation of {@link GridSampler} used by the library. One global
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* instance is stored, which may sound problematic. But, the implementation provided
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* ought to be appropriate for the entire platform, and all uses of this library
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* in the whole lifetime of the JVM. For instance, an Android activity can swap in
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* an implementation that takes advantage of native platform libraries.
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*
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* @param newGridSampler
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*/
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public static void setGridSampler(GridSampler newGridSampler) {
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if (newGridSampler == null) {
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throw new IllegalArgumentException();
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}
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gridSampler = newGridSampler;
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}
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/**
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* @return the current implementation of {@link GridSampler}
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*/
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public static GridSampler getInstance() {
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if (gridSampler == null) {
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gridSampler = new DefaultGridSampler();
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}
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return gridSampler;
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}
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/**
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* <p>Given an image, locations of a QR Code's finder patterns and bottom-right alignment pattern,
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* and the presumed dimension in modules of the QR Code, implemntations of this method extract
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* the QR Code from the image by sampling the points in the image which should correspond to the
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* modules of the QR Code.</p>
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*
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* @param image image to sample
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* @param topLeft top-left finder pattern location
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* @param topRight top-right finder pattern location
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* @param bottomLeft bottom-left finder pattern location
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* @param alignmentPattern bottom-right alignment pattern location
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* @param dimension dimension of QR Code
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* @return {@link BitMatrix} representing QR Code's modules
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* @throws ReaderException if QR Code cannot be reasonably sampled -- for example if the location
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* of the finder patterns imply a transformation that would require sampling off the image
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*/
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protected abstract BitMatrix sampleGrid(MonochromeBitmapSource image,
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FinderPattern topLeft,
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FinderPattern topRight,
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FinderPattern bottomLeft,
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AlignmentPattern alignmentPattern,
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int dimension) throws ReaderException;
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/**
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* <p>Checks a set of points that have been transformed to sample points on an image against
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* the image's dimensions to see if the endpoints are even within the image.
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* This method actually only checks the endpoints since the points are assumed to lie
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* on a line.</p>
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*
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* <p>This method will actually "nudge" the endpoints back onto the image if they are found to be barely
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* (less than 1 pixel) off the image. This accounts for imperfect detection of finder patterns in an image
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* where the QR Code runs all the way to the image border.</p>
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*
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* @param image image into which the points should map
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* @param points actual points in x1,y1,...,xn,yn form
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* @throws ReaderException if an endpoint is lies outside the image boundaries
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*/
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protected static void checkEndpoint(MonochromeBitmapSource image, float[] points) throws ReaderException {
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int width = image.getWidth();
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int height = image.getHeight();
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checkOneEndpoint(points, (int) points[0], (int) points[1], width, height);
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checkOneEndpoint(points, (int) points[points.length - 2], (int) points[points.length - 1], width, height);
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}
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private static void checkOneEndpoint(float[] points, int x, int y, int width, int height) throws ReaderException {
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if (x < -1 || x > width || y < -1 || y > height) {
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throw new ReaderException("Transformed point out of bounds at " + x + ',' + y);
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}
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if (x == -1) {
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points[0] = 0.0f;
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}
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if (y == -1) {
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points[1] = 0.0f;
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}
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if (x == width) {
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points[0] = width - 1;
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}
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if (y == height) {
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points[1] = height - 1;
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}
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}
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}
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