Transit surveys have to observe many stars all at once in order to compensate
for the rarity of the searched events. Such surveys, especially the ones
observing a deep field of view and/or broadening their stellar images, have to
deal with a relatively high level of crowding. This crowding could lead to a
reduction of the number of detectable transits, and the estimation of the
potential of such surveys without taking into account the influence of blends
could give overoptimistic results. We have developed a code which allows to
estimate the extent by which such a survey is affected by the crowding of the
field of view. Our results show that the influence of blends is important only
for severe levels of crowding and is in general much less crucial than the
influence of red noise.Comment: 6 pages, 4 figures; to be published in Transiting Extrasolar Planets
Workshop, Eds: Cristina Afonso, David Weldrake & Thomas Hennin