Image sensor and camera technologies for 21 century have been presented. At first, many kinds of sensing devices are discussed. Next, new camera technologies using advanced intelligent technologies are discussed. Last, Camera technologies to take an emotional feeling picture have been expected.
The image sensing with a large number of image sensors is very effective for collecting global information throughout the very wide area, however, how to transfer and process vast amount of data is one of the critical issues when the number of sensors increases. Accordingly, a careful system design is required in order to avoid an unexpected congestion collapse caused by numerous image sensors. In this paper, we present several simple rate control schemes utilizing a group of smart image sensors by which random spatial sampling can be achieved at image acquisition level. An individual sensor is mounted on a TCP/IP-ready sensor node developed for communicating with other sensor nodes or a hosting machine in the system. Simulation results show that the proposed schemes are simple and effective for reducing the data volume as a source control.
Most of the conventional multiple-image processing systems with sequential readout image sensors (such as CCDs) sacrifice spatial or temporal resolution because of the heavy amount of input data. If the sensors output certain pixels only, that are necessary for the processing, the system will be less complicated or will be operated at higher frame rates. We designed and fabricated a prototype of selective pixel output image sensor. We verified the selective output function of the prototype at both 60 frame/second and 540frames/second.
We propose an implanted retinal prosthesis device using an image sensor based on pulse frequency modulation. A dynamic range of the device is found to be limited by the balance between the charge current and the photocurrent. For implanting the device in a retina, the characteristic are required to be controlled externally. We have fabricated and demonstrated a simple circuit to control the output pulse frequency. Also programmable waveform generation circuits and biphasic output circuits have been demonstrated.
We have developed a large scale, 3.4M pixel, high-speed, 680MHz data rate, TDI image sensor suitable for use in confocal microscope applications. Since the confocal optics has a pinhole aperture that restricts the light intensity, TDI scanning has an advantage in collecting more photons. It is not a simple task to satisfy the 100% aperture efficiency requirement and a complete charge transfer both at the same time. We have solved this problem by developing a unique TDI cell and a novel Split Gate Virtual Phase CCD technology that have met the required performance goals. Another important sensor feature, in addition to its high data rate readout, is itsbi-directionalcharge transfer scan in vertical image direction. This significantly simplifies the system mechanical design
We have investigated photoelectric properties of dye-dispersed organosilicon polymer toward a next-generation functional photoconductive film. We propose a shared-function-type film : dispersed dye generates an electric charge and conductive organosilicon polymer transports the charge. The film will have the high-speed response and the flexibility of wavelength selectivity. In this study, we synthesized a poly(m-hexoxyphenyl)phenylsilane (PHPPS) and clarified its photoelectric properties in thin film state doped with coumarin 6. It is confirmed that PHPPS carried effectively the electric charge which was generated inside the coumarin 6.