Recently, demands for implementation of a high-speed image recognition function onto autonomous vehicles and robots, that is superior to that of the human eye, have been increasing. To date, analog-type vision chips and digital vision chips have been developed. Nevertheless, even now, realizing such high-speed real-time image recognition operation is extremely difficult because the template information transfer rate and template matching operation cycle reach the order of Petapixel/s. Therefore, to accommodate template matching operations that can be executed at rates greater than Petapixel/s, a dynamically reconfigurable vision-chip architecture has been developed in which a holographic memory technique is introduced to current VLSI technology. However, the dynamically reconfigurable vision-chip architecture must receive image information in addition to configuration context information. At such a time, a salient concern is that image information light might reduce the retention time of photodiode memories on a dynamically reconfigurable vision-chip. This paper therefore clarifies that the background light does not affect the photodiode memories on a dynamically reconfigurable vision-chip architecture.