OpenCV detect-multi-scale confusion

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I am using OpenCV's detect multi-scale. I do not understand however, whether the scale0 parameter refers to a downscale or an upscale factor. (Or both?). The documentation is here.

The documentation says that the scale0 parameter refers to the co-efficient of the window increase. Does this then mean that the image is only ever downsampled, for nLevels?

Thank you.

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