The VCX score is an objective and reliable indicator for the quality of a camera in a mobile device because it is measured accurately in the same test environment thereby excluding environmental variation as much as possible. For these measurements, all test labs are first synchronized and all test environments are very carefully inspected according to the guidelines.
A VCX test measurement currently consists of three parts: Image Quality, Response Time and Motion Control.
Variables are controlled and kept constant throughout the test. Any changes in a variable during an experiment or in between tests would invalidate the correlation of dependent variables to the independent variable, thus skewing the results.
Ideally one image contains all the information that we need for the various image quality aspects, e.g. dynamic range and sharpness.
Factory default settings are selected and the default camera app with automatic exposure control is used. The analysis is performed based on the final JPG image data using the camera internal image processing pipeline.
The image quality evaluation based on the TE42v2 test chart is performed under five different lighting conditions:
The metrics in the part “Response Time” are measured using the Image Engineering timing kit. The start of the exposure can still be determined, as it is the position of the first LED that is of interest.
The analysis is made using software that has been shown to comply with the IQ-Analyzer and the VCX chart files. All the data which is extracted from the measurements will be computed without additional subjective analysis. The proportion of each metric in the score is determined by the VCX-Forum members when generating a VCX version.
The process is updated annually with new versions. the professional and detailed information can be found on the white paper. If you have any further questions, please contact the VCX coordinator.