摘要:
An imaging system having a folded optical axis that is accomplished through the effect of a first lens group, a prism, and a second lens group wherein a second surface of the prism is a mirror wherein the folded imaging system exhibits a horizontal field of view (HFOV) greater than 160 degrees and a vertical field of view (VFOV) greater than 80 degrees. Further aspects include a conjugate ratio of the lenses to be substantially 5.47 and a ratio of the entire lens focal length to the focal length of the first lens to be substantially −0.309.
摘要:
A capsule camera apparatus includes a swallowable housing, a light source within the housing, a camera within the housing for capturing a first digital image and a second digital image of a view of the camera illuminated by the light source, a motion detector that detects a motion of the housing the first digital image and the second digital image, and a motion evaluator that selects a disposition of the second digital image, based on a metric on the motion. The disposition may include writing the second image into an archival storage or providing the second digital image to the outside by a wireless communication link.
摘要:
An apparatus for coupling radiation of individual laser diode emitters into a common optical fiber is disclosed. The radiation is collimated along fast axis and combined by using crossed pairs of flat mirrors. The combined beams are collimated by a common slow axis collimating lens. The laser diode emitters are disposed on both sides of an optical axis of the slow axis collimating lens such that the optical path lengths from the emitters to the slow axis collimating lens are equal.
摘要:
The invention is directed to a system and method for vivo image capturing system. The system includes a camera having an entrance pupil, where the camera is configured to capture a panoramic image of an environment surrounding the camera, wherein the panoramic image is captured on a single image plane. The system further includes a light source for providing an illumination source for the camera and a closed housing for enclosing the camera and the light source.
摘要:
In a detection circuit for ASK or OOK modulation, the received modulated signal is ac coupled to a dc restoration circuit and amplified. The dc restoration is carried out on signal peaks corresponding to “mark” intervals of the modulated signal. Thus data may be recovered even in the presence of high levels inband continuous interfering signals.
摘要:
A method characterizes manufacturing imperfections in a camera and variations in its operating environment to allow images captured by the camera to be compensated for these defects. The method includes: (a) illuminating a field of view of the optical elements under a controlled condition; (b) exposing multiple images onto the image sensor under the controlled condition; (c) extracting from the multiple images parameter values for pixels of the image sensor; and (d) compensating images taken subsequently in the camera using the parameter values. The controlled condition includes an external light source for illumination, and the image sensor is sensitive to color components.
摘要:
An in vivo imaging system is provided with a capsule having at least one balloon configured to orient the capsule in a consistent orientation relative to an internal organ; at least one valve configured to control the quantity of gas within the at least one balloon; and an imager encased within the capsule.
摘要:
An integrated circuit comprises a biasing circuit for maintaining the transconductance of a Gm cell constant. The integrated circuit comprises an on-chip constant voltage source and an on-chip constant current source. The on-chip constant current source has a connection for an external resistance, the value of the external resistance determining the current generated by the constant current source. The biasing circuit comprises means for providing a first fraction (β) of the current generated by the on-chip current source to bias the output of the Gm cell, and means for providing a second fraction (α) of the voltage generated by the on-chip voltage source to bias the input of the Gm cell. The transconductance of the Gm cell is controlled to be equal to the ratio of said fraction of the current generated by the on-chip current source to said fraction of the voltage generated by the on-chip voltage source.
摘要:
We describe a variable bandwidth tunable optical spectral filtering device and associated method for selectively directing a portion of a wavelength multiplexed input signal, entering through one or more optical fibers, into one or more output signals provided to one or more optical fibers and/or electronic outputs. The optical filtering is accomplished using free-space diffractive wavelength de-multiplexing optics combined with a fixed (permanent) patterned structure located in the spectrally dispersed image plane. The structure can direct a selected spectral portion of the optical signal to one or more separate outputs, such as an optical fiber or power detector. A single active element in the optical path is used to spatially shift, or steer, the entire input spectrum at the dispersed spectral image plane, to control the portion of the input spectrum illuminating specific features on the permanent patterned structure. In one preferred embodiment, a device with a fixed selective area triangular shaped tilted reflective facet on a flat reflective surface is constructed such that the light reflected off the flat reflective surface and off the triangular reflective facet are selectively multiplexed back and directed to different output fiber ports. Inputs at different angles of incidence on the reflective structures may be deflected by the same structures to different output port fiber ports. A reconfigurable variable-bandwidth tunable optical add/drop multiplexing device is constructed using such a filtering device and an application of such an add/drop multiplexing in a optical transport network is demonstrated.