I want to ask about MultiScale Object Detection. For the multiscale, if we have an original image do I need to zoom-in at different scales in the image at a particular point or zoom-out at different scales in the image at a particular point?
Multiscale object detection generally consists in smoothing the image with larger and larger kernels, to check which objects persist across different scales. So, zoom-out, mostly. You now can have access to the scale-space representation of the image, as shown below.
One reason is that, without more knowledge, one does not zoom in beyond the pixel width. As illustrated (with humour) in the following picture.
Meanwhile, in certain conditions, subpixel resolution or superresolution is possible.