/** * A fast method to retrieve one row of data from the matrix as a BitArray. * * @param y The row to retrieve * @param row An optional caller-allocated BitArray, will be allocated if null or too small * @return The resulting BitArray - this reference should always be used even when passing * your own row */ public BitArray getRow(int y, BitArray row) { if (row == null || row.getSize() < width) { row = new BitArray(width); } else { row.clear(); } int offset = y * rowSize; for (int x = 0; x < rowSize; x++) { row.setBulk(x * 32, bits[offset + x]); } return row; }
/** * A fast method to retrieve one row of data from the matrix as a BitArray. * * @param y The row to retrieve * @param row An optional caller-allocated BitArray, will be allocated if null or too small * @return The resulting BitArray - this reference should always be used even when passing * your own row */ public BitArray getRow(int y, BitArray row) { if (row == null || row.getSize() < width) { row = new BitArray(width); } else { row.clear(); } int offset = y * rowSize; for (int x = 0; x < rowSize; x++) { row.setBulk(x * 32, bits[offset + x]); } return row; }
public BitArray getBlackRow(int y, BitArray row) throws NotFoundException { LuminanceSource source = getLuminanceSource(); int width = source.getWidth(); if (row == null || row.getSize() < width) { row = new BitArray(width); } else { row.clear(); } initArrays(width); byte[] localLuminances = source.getRow(y, luminances); int[] localBuckets = buckets; for (int x = 0; x < width; x++) { int pixel = localLuminances[x] & 0xff; localBuckets[pixel >> LUMINANCE_SHIFT]++; } int blackPoint = estimateBlackPoint(localBuckets); int left = localLuminances[0] & 0xff; int center = localLuminances[1] & 0xff; for (int x = 1; x < width - 1; x++) { int right = localLuminances[x + 1] & 0xff; // A simple -1 4 -1 box filter with a weight of 2. int luminance = ((center << 2) - left - right) >> 1; if (luminance < blackPoint) { row.set(x); } left = center; center = right; } return row; }
row = new BitArray(width); } else { row.clear();
row = new BitArray(width); } else { row.clear();