A full-color scanning fiber endoscope

Seibel, Eric J.; Johnston, Robert A.; Melville, C. David

doi:10.1117/12.648030

Cited by 47 publications

(37 citation statements)

References 5 publications

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“…Registration currently as- Fig. 6 Mosaic of a model esophagus imaged using a Scanning Fiber Endoscope (Seibel et al 2006) sumes brightness constancy, but this is a simplification in many cases since both the camera and light position can be moving. Specular highlights deviate from this assumption particularly and cause pixels to become saturated.…”

Section: Resultsmentioning

confidence: 99%

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Rectified Surface Mosaics

Carroll

Seitz

2009

Int J Comput Vis

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We approach mosaicing as a camera tracking problem within a known parameterized surface. From a video of a camera moving within a surface, we compute a mosaic representing the texture of that surface, flattened onto a planar image. Our approach works by defining a warp between images as a function of surface geometry and camera pose. Globally optimizing this warp to maximize alignment across all frames determines the camera trajectory, and the corresponding flattened mosaic image. In contrast to previous mosaicing methods which assume planar or distant scenes, or controlled camera motion, our approach enables mosaicing in cases where the camera moves unpredictably through proximal surfaces, such as in medical endoscopy applications.

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Section: Resultsmentioning

confidence: 99%

“…6) was created as a proof of concept for the algorithm's use with an ultrathin Scanning Fiber Endoscope being developed at the University of Washington Human Photonics Lab (Seibel et al 2006). The camera is unique in that it captures pixels sequentially from a spiraling optical fiber.…”

Section: Model Esophagusmentioning

confidence: 99%

Rectified Surface Mosaics

Carroll

Seitz

2009

Int J Comput Vis

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“…The tip could be bent in four directions with a minimum bending radius of 8 mm at the inside bend. Seibel et al [6] developed a scanning fiber endoscope with a distal tip diameter of only 1.6 mm. However, the endoscope had a maximum frame rate of 15 Hz, not suitable for real-time imaging.…”

Section: Introductionmentioning

confidence: 99%

Miniaturized CMOS Imaging Module with Real-time DSP Technology for Endoscope and Laryngoscope Applications

Wang

Yan

et al. 2008

J Sign Process Syst Sign Image Video Technol

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Miniaturized video camera is a key component in modern medical devices such as endoscopes or other minimally invasive instruments. Here we present a new imaging module which is so small that it can fit through the instrument channels of conventional endoscopes and laryngoscopes. This imaging module includes a 1/18-in. CMOS image sensor and a small integrated lens with field of view of 120°. A Blackfin DSP is used for real-time video processing, including lens distortion compensation, white balance, auto exposure and edge enhancement. The output video signals are displayed on a color LCD monitor. Two white LEDs provide lighting condition. The tip of the imaging module is packaged in a cylinder of diameter 2.5 mm, making many medical applications such as intubation and endoscopy less invasive. It can also be used in machine vision, security and surveillance where small size is important.

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“…Initial prototypes were used to develop wearable displays for users with low vision; however, a raster-scanning approach using two orthogonal piezoelectric actuators limited display resolution to 100 x 39 pixels [4][5][6]. Subsequent development focused on using scanning fiber engines to create ultra-thin endoscopes and dramatic improvements to the core fiber-scanning technology have been achieved [7][8][9][10][11][12][13].In this paper, we describe a proof-of-concept compact monochrome scanned-laser projection display prototype using an improved scanning fiber engine capable of producing 500 line by 500 pixel images with a maximum throw angle of 100°. The scanner is dynamically configurable; the scan angle can be adjusted dynamically to accommodate different screen sizes at variable projection distances, and resolution can be traded for frame rate to optimize for high resolution still images or high frame rate video presentation.…”

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confidence: 99%

P‐251L: Late‐News Poster: Miniature Wide‐Throw‐Angle Scanning Fiber Projection Display

Schowengerdt

Kundrat

Lee

et al. 2008

Symp Digest of Tech Papers

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Advances in mobile devices have enabled internet access and viewing of images and video, but small screens constrain the experience. We have developed a novel scanning fiber optical projector that is 1.07 mm in diameter and 13 mm long, and can project images at up to a 100° throw angle. IntroductionThe increasing computational power and connectivity of mobile devices, such as cell phones, video iPods, and PDAs, have enabled mobile internet access and playback of large images and video. However, the usefulness of such capabilities is limited by small screens. A compact projector unit as a display for a mobile device can increase effective screen size without significantly increasing the size and weight of the devicehowever, it is nontrivial to create a sufficiently compact and lightweight optical projection engine.Projectors using LCD panels as imaging elements are reasonably low cost, but are not energy efficient. To create dark pixels in the projected image, LCD panels block a portion of the light energy generated by the source from reaching the screen, so dark images require as much energy to project as bright images, placing an additional drain on the limited battery capacity of mobile devices. Furthermore, the maximum resolution of the projector is constrained by the size of the LCD panel and the attainable pixel pitch. In order to increase resolution, the dimensions of the LCD panel in the mobile device must be increased proportionately.Holographic projectors can provide the advantage of lowered power consumption, as the majority of the light generated by the laser sources reaches the screen [1]. However, holographic image generation requires complex processing, placing high computational demands on mobile devices with small, lowvoltage processors, and the resolution of the projected image is also ultimately dependent on the size and pixel pitch of the spatial light modulator used to generate the holographic image.In contrast, scanned beam displays sweep a single pixel serially across a surface to form an image, and an increase in image resolution does not require an increase in the size of the components in the device. Instead, their resolution is governed primarily by the number of scan lines-dependent, in turn, on the frequency of the optical scanner-and the speed at which the light source can be luminance-modulated. In addition, such displays are energy efficient, as less power is required to display darker pixels. Scanned beam projection displays using miniature scanning mirrors and modulatable laser sources have been developed [2-3].The compactness of such projectors is limited by the physical arrangement necessary to guide light from the source(s) at an appropriate reflection angle for the scanning mirror to create a useable image.We have developed a novel light-scanning engine that uses a vibrating optical fiber to scan light in two axes. Rather than reflecting light from a scanning element, the light is deflected directly as it emerges from being transmitted along the optical fiber, enabling a reduc...

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A full-color scanning fiber endoscope

Cited by 47 publications

References 5 publications

Rectified Surface Mosaics

Rectified Surface Mosaics

Miniaturized CMOS Imaging Module with Real-time DSP Technology for Endoscope and Laryngoscope Applications

P‐251L: Late‐News Poster: Miniature Wide‐Throw‐Angle Scanning Fiber Projection Display

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