The Twentieth Symposium on Signal Processing, Images and Computer Vision, STSIVA-2015, will be held in P. Universidad Javeriana, Bogotá, between Sept. 2nd and 4th, 2015. STSIVA is the most traditional academic event specialized on Signal Processing in Colombia: It annually gets together researches, academics, professionals and students to present and openly discuss subjects of mutual interest in an scientific atmosphere. Since 2000, STSIVA has had the contribution of international speakers. Since 2006, STSIVA has been sponsored by the IEEE Signal Processing Society, Colombian Chapter, created by professors, regular participants of STSIVA. Since 2012, the Memories of STSIVA have been published through IEEE Xplore to obtain international visibility.