Abstract
This paper proposes a line-based method for measuring the modulation transfer function (MTF) of a display. In this method, the spatial distribution of a single line that is displayed in a small region of the screen is analyzed. This is performed by capturing the displayed line by a light measuring device (LMD). The square sampling grid of the LMD is set slightly slanted relative to the displayed line so that the line is recorded with various offsets with respect to the sampling positions. By analyzing a supersampled 1D line spread function generated from a small region of interest (ROI) in the image of the captured line, the display MTF is estimated. The convolution theorem is used to compensate the display MTF for the underestimation related to the spatial performance or MTF of the LMD. Thereby, accurate display MTF results are obtained for a wide range of pixel ratio, i.e., the number of pixels of the measurement device per display pixel interval. The proposed method was validated using computer-generated images of a model display with an RGB stripe subpixel arrangement and a model LMD. The utilization of a low pixel ratio enables the measurement to be performed using a small lens and long working distance. In addition, the small size of the employed ROI significantly reduces the computational cost and allows the use of a low-resolution camera.
Highlights
Ultrahigh definition (UHD) technology produces visually realistic digital images [1]
To address the challenges of the existing methods, this paper provides the modulation transfer function (MTF) concept for sampled imaging systems and proposes a new line-based MTF measurement method that utilizes the convolution theorem
The proposed line-based display MTF measurement method involves an analysis of the spatial distribution of a single line displayed in a small region of the screen, which is captured by an light measuring device (LMD)
Summary
Ultrahigh definition (UHD) technology produces visually realistic digital images [1]. UHD devices are usually categorized by the horizontal pixel counts of the standard image formats of their input/output signals, such as 4K and 8K. The spatial imaging performance of a display is typically not solely determined by the pixel count. The optical elements used in a display structure affect the spatial imaging performance. A diffusing film can be overlaid on the front surface of a panel to improve the viewing angle and reduce the specular reflection of ambient light. Such front surface diffusers generate interpixel crosstalk and sparkle, VOLUME XX, 2017
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