scope:

Introduction

Throughout this Report a hierarchy of spatial resolutions, which is recommended in Recommendation ITU-R BT.1201 and also given in Table 1, is adopted to classify spatial resolution of pictures in extremely high resolution imagery (EHRI). The limitation of available technologies in this area used to force us to stay mainly in still (non-real-time picture) image applications for higher resolutions. Recently real-time systems for higher resolution systems are reported though those are still in the experimental stage. Basically real-time applications in this area can be defined in terms of frame repetition rates independent of the spatial resolution hierarchy.

The attention of the reader is drawn to Table 19 where some questions have been raised that need further study.

The hierarchy is based on the well accepted 16:9 picture aspect ratio.

EHRI-1 to 3 are simple integer multiples of EHRI-0 pixel counts, namely 1 920 × 1 080, in horizontal and vertical directions, i.e. the multiplier is the suffix value plus 1.

The EHRI hierarchy in Table 1 is in spatial domain and is independent of the temporal axis. In the real-time case, images are classified by specifying the frame rate in the temporal axis.