  Ground-based gamma-ray astronomy aims at reconstructing the energy and
direction of gamma rays from the extensive air showers they initiate in the
atmosphere. Imaging Atmospheric Cherenkov Telescopes (IACT) collect the
Cherenkov light induced by secondary charged particles in extensive air showers
(EAS), creating an image of the shower in a camera positioned in the focal
plane of optical systems. This image is used to evaluate the type, energy and
arrival direction of the primary particle that initiated the shower. This
contribution shows the results of a novel reconstruction method based on
likelihood maximization. The novelty with respect to previous likelihood
reconstruction methods lies in the definition of a likelihood per single camera
pixel, accounting not only for the total measured charge, but also for its
development over time. This leads to more precise reconstruction of shower
images. The method is applied to observations of the Crab Nebula acquired with
the Large Size Telescope prototype (LST-1) deployed at the northern site of the
Cherenkov Telescope Array.
