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Hi. To skip the first scales you can downscale the image before running detectMultiScale using resize method.

//assuming img is your input image

// 1. compute scale
const double scale = pow(1.05,13); // scale factor per level = 1.05 and 13 levels to skip
cv::Mat smallerImg;

// 2. compute downscaled roi
const cv::Size sz(cvRound(img.cols/scale), cvRound(img.rows/scale));

// 3. resize image to downscaled roi
resize(img, smallerImg, sz);

// 4. run detectMultiScale