Isao Kawahara

12.3: New Findings on Display Performance in Large-Sized PDP

In this paper, we describe new findings on display performance in large-sized PDP we acquired through the development process of the world first 65″ 1920×1080p PDP-TV released in November 2005. Closest viewing distance proved to be only 2/3 of the previous understanding, and that perceived motion resolution having favorable features even in lower resolution panels. Sub-field scheme and sub-pixel rendering are discussed to verify the high performance of PDP.

Basic concept of 3D full HD plasma theater system

This paper introduces basic concept of 3D Full HD Plasma Theater System, featuring full HD resolution of 1080p and 60Hz frame rate, taking the advantages of self-luminous performance of plasma display and high potential of Blu-ray Disc system.

10.4: Measurement of Moving Picture Resolution for Displays Using Scrolled Sine-Bursts

Measurement of moving picture resolution for displays has been established, featuring a set of scrolled sine-bursts with different frequencies and different signal levels. for higher accuracy, ingenious ideas including sub-pixel scrolling are introduced, showing the definite advantages over response-time-based approaches. Automated system and human visual perception are also discussed.

P-189L: Late-News Poster: Advantages of Sinusoidal-Burst Based Measurement of Moving Image Performance

Measurement of moving picture resolution, using sinusoidal-bursts with sub-sampling, has clear advantages over conventional approaches, securing high compatibility with computer and television formats including 1080i/p, high precision up to the pixel resolution, also providing reliable and efficient methodology for subjective test as well as automated measurement.

Scene reconstruction from distorted images using self-calibration of camera parameters

In this paper, we propose a new method for reconstructing a scene from different views through a high-distortion lens camera. Unlike other approaches, no a priori calibrations nor specific test patterns are required. Several pairs of correspondence between input images are used to estimate intrinsic parameters such as focal length and distortion coefficients. From these correspondences, relative movement of the camera between input images is computed as rotation matrices. We assumed radial lens distortion, modeled with a third order polynomial with two distortion coefficients, which covers highly distorted zoom lenses. Since we allow distortion with two coefficients and focal length to be unknown, it is not easy to get these three parameters explicitly from the correspondence alone. To avoid time consumption and the problem of local minima, we take the following steps: uniform searching in the reduced dimension; fitting a function to get a better guess of focal length; and polishing solutions by repeating the uniform search to get the final coefficients of distortion. The total number of evaluations is remarkably reduced by this multistage optimization. Some experimental results are presented, showing that more than 5% of lens distortion is reduced and the rotation of the camera is recovered, and we show a registration of four outdoor pictures.