Auto flash performance test using exposure accuracy

Abstract

General auto flash focuses on representing the actual object luminance depending on the object's luminance condition, that is, whether it is dark or bright. Although it is an intelligent development, it is hard to find a standard for measuring auto flash performance. In this study, we present a new auto flash performance measurement. For auto flash performance evaluation, we select the exposure accuracy that affects image quality when exposure failure occurs. For exposure accuracy, these are the methods of measurement. At first, we select the auto flash exposure accuracy that depends on object distance. It evaluates when auto flash measures the equivalent luminance of the same object depending on diverse object distance within the auto flash valid range. The next is auto flash accuracy that depends on object luminance. And lastly, a test of auto flash accuracy that depends on ambient lighting is conducted. Auto flash can recognize ambient lighting and measure the accurate object luminance.