Author Archives: DXOMARK

Camera quality is a major reason for consumers to choose between smartphones. However, evaluating a camera’s quality is costly, cumbersome, and, in many cases, a non-repeatable process. To simplify and improve this process, many techniques have been developed for automatic image quality assessment. In the state of the art, image detail quality assessment is predominantly […]

Color appearance across ambient Correlated Color Temperature (CCT) changes is an important aspect for preferred image quality. Smartphones nowadays are equipped with ambient illumination sensors, called Ambient Light Sensors (ALS), that are capable of detecting the illuminance information in terms of illuminance and CCT (either spectral or color). These sensors aid the detection of ambient […]

Several studies in the past have proposed models to characterize the colorimetry of displays, most of which have poor performance for OLED displays. This is primarily due to the dependency of the colorimetry of OLED panels on the AveragePixel Level (APL) of the content displayed on them. In this study, a workflow is proposed to […]

HDR videos can be encoded in a variety of formats with dynamic metadata, the most popular of which are Dolby Vision, HDR Vivid and HDR10+. In this paper, the decoding strategies of these three encoding options are subjectively analyzed in order of their preference in smartphones by performing a psychophysical experiment in a laboratory environment. […]

Modern HDR video playback strategies often involve adjustments by industry stakeholders, such as applying different Electro-Optical Transfer Functions (EOTFs), modifying peak luminance, or altering color characteristics, to enhance visual appeal. These modifications, however, can deviate from the originalartistic intent. Understanding observer preferences for such alterations is crucial, especially for smartphone playback under diverse ambient lighting. […]

Smartphones are exposed to a variety of illumination changes. For the best user experience, it is important that their rendering is consistent across illuminance changes. In this study the rendering consistency performance of three differentsmartphones is studied across three illuminance conditions (0,320 and 9000 lux) using a haploscopic setup. It was found that the Samsung […]