Luminance effects on display resolution and noise

摘要

The measurement of image quality in diagnostic monochrome display devices has been the focus of recent efforts. However, there has not been a complete understanding of the capabilities of such methods to appropriately characterize display resolution and noise. In addition to being influenced by the luminance level of the scene being displayed, both properties are affected by the intrinsic details of the pixel emissive structures. In this paper, we report on the resolution and noise properties of cathode-ray tubes (CRTs) and active-matrix liquid crystal displays (AMLCDs). We present results on the resolution and noise characteristics of 5-megapixel monochrome CRTs and a 3-megapixel monochrome AMLCD with dual-domain in-plane switching pixel design. The CCD camera was calibrated using a uniform light source constructed specifically for excellent spatial uniformity. The methods employed for resolution are based on either the measurement of line patterns or the broadband transfer method. Noise is analyzed in terms of 2-dimensional noise power and signal-to-noise ratios. We found that all 4 methods considered are affected by residual deterministic structure in the recorded images. Especially in AMLCDs, the MTFs computed by the line method and broadband response method do not agree, due to contributions of the non-stochastic component that remain in the analyzed images after subtraction of a representative background.