Whole slide imaging (WSI) scanner scans pathological specimens to produce digital slides to use in pathology practice, research and computational pathology which enables monitor-based diagnosis and image analysis. However, the scanned image is sometimes insufficient in quality such as focusing-error and noise. Therefore, a quality evaluation method is obligatory for practical use of WSI system. In previous work, referenceless quality evaluation technique was proposed for this purpose but some artefacts (i.e. tissue-fold, air-bubble) in slide would also be detected as false positives, while they are useless. In this paper, we proposed a method for the practical system to assess WSI quality with eliminating false detection due to the artefacts. Firstly, support vector machine (SVM) was utilized for detecting ROIs with artefacts and then the image quality was evaluated excluding detected ROIs. Through the experiments, the effectiveness of proposed system has been demonstrated.
Volume hologram, which has unique characteristics such as wavelength and angular selectivity, is a powerful tool for enabling computational imaging. For example, light-field three-dimensional imaging can be realized with a thin, flat, and transparent material by utilizing the volume hologram. This report mainly introduces the light-field imaging system utilizing volume hologram with describing a calibration method and an experimental result. The talk corresponding to this report also addresses other imaging applications of the volume hologram.
We propose a fast calculation method to synthesize a computer-generated hologram (CGH) of realistic deep three-dimensional
(3D) scene. In our previous study, we have proposed a calculation method of CGH for reproducing such scene
called ray-sampling-plane (RSP) method, in which light-ray information of a scene is converted to wavefront, and the
wavefront is numerically propagated based on diffraction theory. In this paper, we introduce orthographic projection to the
RSP method for accelerating calculation time. By numerical experiments, we verified the accelerated calculation with the
ratio of 28-times compared to the conventional RSP method. The calculated CGH was fabricated by the printing system
using laser lithography and demonstrated deep 3D image reconstruction in 52mm×52mm with realistic appearance effect
such as gloss and translucent effect.