The JEM-EUSO (Extreme Universe Space Observatory on Japanese Experiment Module) experiment is about a space telescope that will be installed on the ISS in 2020. The UHECR study aims to improve by a factor of 100 the current measures of Pierre-Auger observatory. The telescope EUSO-Balloon, which was technologically validated in 2014 was the first prototype with the whole chain of detection of telescope JEM-EUSO. SPB-EUSO and MINI-EUSO are the next projects with the same PDM that JEM-EUSO. The principle of detection is based on the capture of individual UV photons which refers to the fluorescence produced by the EAS interaction with Earth's atmosphere. The flow of this fluorescence light is so weak that requires an instrument with 100% efficiency for the detection of one photon and that is the case of EUSO telescopes. This document is a final study of the performance of the telescope EUSO-Ballon. More specifically, a method for information retrieval pixels with weak sensitivity was developed. To achieve this, we use 2-photon contribution on the pulse of an event, as the short-time detection obeys the Poisson distribution. Homogenization of the sensitivity of pixels is critical to trigger algorithms. Also the deterioration of the sensitivity of detection in each channel is inevitable. Thus, this method is useful for recalibration cases, where the sensitivity of one photon’s detection decreases dramatically. As the method uses a curve generated by changing the threshold of discrimination of the measure, it is valid for all EUSO telescopes and it will be most useful in the space, where the manipulation of the instrument is limited.