Abstract
We developed a temporally coded exposure (TeCE) camera that can cope with high-speed focus variations of a tunable acoustic gradient index (TAG) lens. The TeCE camera can execute a very short exposure multiple times at an arbitrary timing during one shot. Furthermore, by accumulating the photoelectrons generated by each exposure, it is possible to maintain the brightness even with a short exposure time. By synchronously driving the TeCE camera and the TAG lens, different focal planes of an observation target can be acquired at high speed. As a result, high-speed three-dimensional measurement becomes possible, and this can be used for feedback of three-dimensional information. In the work described in this paper, we conducted a focus tracking experiment to evaluate the feedback performance of the TeCE camera. From the experimental results, we confirmed the feedback capability of the TeCE camera.
Highlights
In the fields of biology and microrobotics, three-dimensional information about the object to be observed or manipulated is required
We evaluated the performance of the temporally coded exposure (TeCE) camera prototype described in the previous section
We propose a prototype system for three-dimensional measurement of minute regions at high speed by synchronously driving a TeCE camera and a tunable acoustic gradient index (TAG) lens, and we evaluated the system experimentally
Summary
In the fields of biology and microrobotics, three-dimensional information about the object to be observed or manipulated is required. Focus scanning is a method used for acquiring an image while scanning the focal position in the direction of the optical axis (Z-axis), and three-dimensional reconstruction is performed based on the series of images acquired at the individual focal positions This three-dimensional reconstruction can be performed with comparatively simple processing, so it is suitable for high-speed three-dimensional measurements. General image sensors do not support such a short exposure, and an image taken with a short exposure becomes very dark To solve this problem, a method was proposed to synchronize RGB strobe illumination with the focus fluctuation of the TAG lens [16,17]. A method was proposed to synchronize RGB strobe illumination with the focus fluctuation of the TAG lens [16,17] This method realizes the same effect as short-time exposure by illuminating the object only when the TAG lens reaches a specific focal position. The feedback control capability of the TeCE camera was confirmed
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