Methods and systems for image upscaling are disclosed. The rare-earth doped fiber amplifier is formed to comprise a normal dispersion, which when combined with self-phase modulation and distributed gain leads to a regime in amplifiers defined as \u201cself-similar propagation\u201d. The voltage to be applied from the high-voltage power supply is not less than an ion production threshold voltage but is less than a corona discharge threshold voltage. Upon the depression of the conversion key, the homonym candidate selection routine is initiated, and the conversion candidate is presented.