icvprCcaByTwoPass函数似乎有bug

[xylcbd]

icvprCcaByTwoPass函数在边缘地带没有做处理。

[xylcbd]

部分代码修改：

int rows = _binImg.rows - 1;
int cols = _binImg.cols - 1;    
for (int i = 0; i < rows; i++)
{
    int* data_preRow = (i==0) ? NULL : _lableImg.ptr<int>(i - 1);
    int* data_curRow = _lableImg.ptr<int>(i);
    for (int j = 0; j < cols; j++)
    {
        if (data_curRow[j] == 1)
        {
            std::vector<int> neighborLabels;
            neighborLabels.reserve(2);
            if (j > 0)
            {
                int leftPixel = data_curRow[j - 1];
                if (leftPixel > 1)
                {
                    neighborLabels.push_back(leftPixel);
                }
            }
            if (data_preRow)
            {
                int upPixel = data_preRow[j];
                if (upPixel > 1)
                {
                    neighborLabels.push_back(upPixel);
                }
            }
            if (neighborLabels.empty())
            {
                labelSet.push_back(++label);  // assign to a new label
                data_curRow[j] = label;
                labelSet[label] = label;
            }
            else
            {
                std::sort(neighborLabels.begin(), neighborLabels.end());
                int smallestLabel = neighborLabels[0];
                data_curRow[j] = smallestLabel;
                // save equivalence
                for (size_t k = 1; k < neighborLabels.size(); k++)
                {
                    int tempLabel = neighborLabels[k];
                    int& oldSmallestLabel = labelSet[tempLabel];
                    if (oldSmallestLabel > smallestLabel)
                    {
                        labelSet[oldSmallestLabel] = smallestLabel;
                        oldSmallestLabel = smallestLabel;
                    }
                    else if (oldSmallestLabel < smallestLabel)
                    {
                        labelSet[smallestLabel] = oldSmallestLabel;
                    }
                }
            }
        }
    }
}