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May be surface is less than 25 or convexity<0.8...

Default parameters are :

SimpleBlobDetector::Params::Params()
{
    thresholdStep = 10;
    minThreshold = 50;
    maxThreshold = 220;
    minRepeatability = 2;
    minDistBetweenBlobs = 10;

    filterByColor = true;
    blobColor = 0;

    filterByArea = true;
    minArea = 25;
    maxArea = 5000;

    filterByCircularity = false;
    minCircularity = 0.8f;
    maxCircularity = std::numeric_limits<float>::max();

    filterByInertia = true;
    //minInertiaRatio = 0.6;
    minInertiaRatio = 0.1f;
    maxInertiaRatio = std::numeric_limits<float>::max();

    filterByConvexity = true;
    //minConvexity = 0.8;
    minConvexity = 0.95f;
    maxConvexity = std::numeric_limits<float>::max();
}

May be surface is less than 25 or convexity<0.8...convexity<0.95...

Default parameters are :

SimpleBlobDetector::Params::Params()
{
    thresholdStep = 10;
    minThreshold = 50;
    maxThreshold = 220;
    minRepeatability = 2;
    minDistBetweenBlobs = 10;

    filterByColor = true;
    blobColor = 0;

    filterByArea = true;
    minArea = 25;
    maxArea = 5000;

    filterByCircularity = false;
    minCircularity = 0.8f;
    maxCircularity = std::numeric_limits<float>::max();

    filterByInertia = true;
    //minInertiaRatio = 0.6;
    minInertiaRatio = 0.1f;
    maxInertiaRatio = std::numeric_limits<float>::max();

    filterByConvexity = true;
    //minConvexity = 0.8;
    minConvexity = 0.95f;
    maxConvexity = std::numeric_limits<float>::max();
}