Change downsampling to sample source imaging from back project from the destination to determine region of higher resolution imaging which contribute to downsampled region. Old approach projected from higher resolution imaging to lower resolution imaging and could introduce errors due to integer rounding. Also update absl and boost libraries.
Change downsampling to sample source imaging from back project from the destination to determine region of higher resolution imaging which contribute to downsampled region. Old approach projected from higher resolution imaging to lower resolution imaging and could introduce errors due to integer rounding. Also update absl and boost libraries.