What does a high spatial frequency mean?

The spatial frequency (SF) scales of facial information are generally used to categorizing faces . The image with high spatial frequencies (HSF) represents the fine-scale details of the original image, while the low spatial frequencies (LSF) retain the large-scale global shape of visual formation.

The spatial frequency is defined as line pairs per angular extent of the target , and the phase specifies the relative location of the target image to the detector array raster. From: Encyclopedia of Modern Optics, 2005.

Spatial frequency describes the periodic distributions of light and dark in an image. High spatial frequencies correspond to features such as sharp edges and fine details , whereas low spatial frequencies correspond to features such as global shape.

Radio frequency communications for spacecraft are conducted between 30 MHz and 60 GHz . The lower frequency bands are typically more mature for SmallSat usage, however extensive use of these bands has led to crowding and challenges acquiring licensing.