In this paper, we propose a distance estimation method using tilted lens optics. Our proposed method uses two input images: one is an all-in-focus image, and the other is a ground-in-focus image. The method estimates a distance value for each pixel by comparing the amount of blur between the ground-in-focus image and multi-focus images that are synthesized… (More)
In various fields such as measurement of the distance between cars and three-dimensional recognition in robotics, the depth needs to be estimated over a wide range. For this purpose, we propose a depth estimation method that uses a ground-in-focus image taken by a tilted lens optics camera. Our proposed method detects edges by local scale control. It then… (More)
We have been investigating a depth estimation system for use in automobile applications. Conventional methods with stereo camera are too sensitive to slight variations of baseline length due to vibration and temperature. Conversely, the method that uses a monocular camera by focusing cannot provide a balance between wide-area estimation and realtime… (More)
It is possible to make depth measurements with comparative ease using the stereo camera method. However, because a lengthy baseline is required, this technique is not readily applicable to in-vehicle tasks, which need to be robust to accommodate various disturbances. Also, it is impossible to use conventional monocular-camera methods over a wide visible… (More)
We have been investigating the depth estimation method by depth from focus (DFF) using tilted focal planes imaging. This method uses fewer multiple focus images than the traditional methods. Therefore, it is suitable for high speed depth estimation accomplished by a smart image sensor.
Nasal mucosal samples from thirty-five guinea-pigs were placed in a chamber, containing the medium RPMI 1640. Ciliary activity (beats.s-1) of the most active cell in each mucosal culture was measured using a photoelectric method. The RPMI 1640 was then replaced by 2 ml of RPMI 1640 and 1 ml of heparinized human blood from a non-allergic patient, with a… (More)
Since the middle ear lining is an extension and a modification of the respiratory mucosa, it is conceivable that it has a mucociliary system and it plays an important role in clearance of the tympanic cavity. It was already noted in morphological studies that the middle ear lining had ciliated cells. To our knowledge, however, ciliary activity has never… (More)