opensfm/features.py [345:358]:
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            logger.debug("reducing threshold")
        else:
            logger.debug("done")
            break
    points, desc = descriptor.compute(image, points)

    if desc is not None:
        if config["feature_root"]:
            desc = root_feature(desc)
        points = np.array([(i.pt[0], i.pt[1], i.size, i.angle) for i in points])
    else:
        points = np.array(np.zeros((0, 3)))
        desc = np.array(np.zeros((0, 3)))
    return points, desc
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opensfm/features.py [400:414]:
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            logger.debug("reducing threshold")
        else:
            logger.debug("done")
            break

    points, desc = descriptor.compute(image, points)

    if desc is not None:
        if config["feature_root"]:
            desc = root_feature(desc)
        points = np.array([(i.pt[0], i.pt[1], i.size, i.angle) for i in points])
    else:
        points = np.array(np.zeros((0, 3)))
        desc = np.array(np.zeros((0, 3)))
    return points, desc
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