  Observations from the Heliospheric Imagers (HI-1) on both the STEREO
spacecraft have been analysed to search for bright low mass eclipsing binaries
(EBs) and potential brown dwarf transits and to determine the radii of the
companions. A total of 9 EB candidates have been found, ranging in brightness
from V=6.59 mag to V=11.3 mag, where the radius of the companion appears to be
less than 0.4 Rsol, with a diverse range of host temperatures, from 4074 K to
6925 K. Both components of one candidate, BD-07 3648, appear to be less than
0.4 Rsol and this represents a particularly interesting system for further
study. The shapes of the eclipses in some cases are not clear enough to be
certain they are total and the corresponding radii found should therefore be
considered as lower limits. The EBs reported in this paper have either been
newly found by the present analysis, or previously reported to be eclipsing by
our earlier STEREO/HI-1 results. One of the new objects has subsequently been
confirmed using archival SuperWASP data. This study was made possible by using
an improved matched filter extraction algorithm, which is described in this
paper.
