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// background must be white
static Pair bwii_detectSingleLine(BWIntegralImage ii) {
int whiteValue = 255;
int imgW = ii.getWidth(), imgH = ii.getHeight();
IIntIntPred predX = (x1, x2) -> ii.getPixelAverage(x1, 0, x2, imgH) != whiteValue;
IIntIntPred predY = (y1, y2) -> ii.getPixelAverage(0, y1, imgW, y2) != whiteValue;
// find bounding box
Pair endpoints = pair(
pt(indexOfRangePredicate_IIntIntPred(imgW, predX),
indexOfRangePredicate_IIntIntPred(imgH, predY)),
pt(lastIndexOfRangePredicate_IIntIntPred(imgW, predX),
lastIndexOfRangePredicate_IIntIntPred(imgH, predY)));
// find out which diagonal it is
if (ii.getPixel(endpoints.a) != whiteValue) {
endpoint.s.x
? pair(pt(endpoints.b.x, endpoints.a.y),
pt(endpoints.a.x, endpoints.b.y)) : endpoints;
}