Abstract: A light emitting device is provided with: a self-scanning light emitting element array that includes light emitting elements divided into plural groups, light-controlled for each of the groups, and arrayed in line; and a light-up controller that sets any one of a voltage and a current for light-up, in accordance with the number of light emitting elements intended to light up in each of the groups.

Abstract: An optical scanning device includes four light sources, a pre-deflector optical system, a polygon mirror, an optical scanning system, etc. The optical scanning system includes deflector-side scanning lenses made of glass, imaging-surface-side scanning lenses made of resin, polarized light splitters, and reflecting mirrors. The deflector-side scanning lenses, the imaging-surface-side scanning lenses, the polarized light splitters, and the reflecting mirrors are arranged in this order on an optical path of light going from the polygon mirror toward drum-shaped photosensitive elements.

Abstract: A method for an application server at a remote window source for real-time remote capture, presentation and control of a visual window source created from a calling subscriber's mobile terminal during a video call. The method includes performing the call, displaying the remote window, capturing the remote window by a Window Capture module in real-time and analyzing an interactive input event initiated by the calling subscriber and sending back to the subscriber's mobile phone in encoded video call format. The method also includes waiting by an application instance at the remote window for the input event by the calling subscriber, initiating the input event and acting by the application server on the remote window, accordingly, such that the remote window produces a new window presentation which is captured in real time and transmitted and presented to the calling subscriber during a video call.

Abstract: A method and apparatus for enabling an improved experience by better matching of the auditory space to the visual space in video viewing applications such as those that may be used in video teleconferencing systems and in the viewing of videos with associated audio (e.g., movies). In one embodiment, a viewer's location and head position relative to a video display screen is determined, one or more desired sound source locations (which may, for example, be related to a projection on the video display) are determined, and binaural stereo audio signals which accurately locate the sound sources at the desired sound source locations are advantageously generated.

Abstract: Portable, mobile, lightweight, removable, low cost, easy to manufacture, easy to ship, easy to transport, easy to store, and easy to use optical adapters that provides an effective means of videoconferencing over a mobile phone or other mobile device with a camera. Embodiments include landscape and portrait adapters that can be easily applied, used and removed while maintaining a professional and aesthetic appearance. Small mirrors within the optical adapter allow light from the front of the mobile device to enter the adapter and be conditioned and redirected into the built-in lens of the camera on the back of the mobile device. Novel embodiments include a lens reverser and/or a re-lens. Optical adapters also provide for self-imaging or surveillance. Various protective cases and adapter embodiments are configured to match specific mobile devices.

Abstract: Determining a configuration for a conference. Input may be received specifying a plurality of devices for use in the conference. A configuration may be automatically determined for the plurality of devices for the conference. The configuration may be automatically determined based on the specified plurality of devices and may specify usage of the plurality of devices during the conference. The configuration may specify a first device of the plurality of devices as a control unit. Automatic determination may include obtaining information regarding capabilities of each of the plurality of devices, and creating the configuration based on the capabilities of each of the plurality of devices. Finally, the configuration may be displayed on a display device.

Abstract: The present application discloses a method and apparatus for a multipoint video conferencing system that can offer a wide variety of layouts and the ability to support a large number of conferees. A received stream of NALs from a plurality of endpoints can be processed by an exemplary NAL Processor Module (NPM) and be arranged into a stream of NALs that are referred to in this disclosure as organized NALs (ONALs). Two or more streams of compressed video organized into ONALs can be received by an exemplary NAL Editor Module (NEM), wherein each stream was created from a video image that was generated at an endpoint participating in the conference. An exemplary NEM can comprise a compressed composed frame memory (CCFM) module. Each CCFM can be divided into segments according to the layout of the continuous presence (CP) image that is to be displayed by one or more receiving endpoints.

Abstract: A method and apparatus for enabling an improved experience by better matching of the auditory space to the visual space in video viewing applications such as those that may be used in video teleconferencing systems using window-based displays. In particular, in accordance with certain illustrative embodiments of the present invention, one or more desired sound source locations are determined based on a location of a window in a video teleconference display device (which may, for example, comprise the image of a teleconference participant within the given window), and a plurality of audio signals which accurately locate the sound sources at the desired sound source locations (based on the location of the given window in the display) are advantageously generated.

Abstract: A system and method for displaying images in three dimensions. The system may include a dual axis four lens system, four LCD switching elements, a pair of LCD switched dual filtered dichroic mirrors, and a pair of half silvered dichroic color filter elements, and two charge coupled device pickups. The system may process light through a number of axis to produce optical disparity for presenting three dimensional video.

Abstract: In a video decoding system, a method and system for decoding previously encoded frames of video into a compressed and uncompressed format. The uncompressed format frames may be further stored and utilized to decode additional frames of video. The compressed format frames may be further stored and provided to a display processor to be rendered with additional textures.

Abstract: An image processor includes: an receiving module configured to receive a video signal of a content; an image quality adjusting module configured to adjust image quality of the video signal received by the receiving module using image quality adjustment parameters including at least a contrast-related parameter; a 3D video detecting module configured to determine whether the video signal is of a 3D content; and a control module configured to control the image quality adjusting module to adjust the image quality of the video signal using the contrast-related parameter being set to a second parameter setting for enhancing contrast more than at a first parameter setting, when the video signal is determined to be the 3D content by the 3D video detecting module while the image quality adjusting module is adjusting the image quality using the contrast-related parameter being set at the first parameter setting.

Abstract: In stereo matching based on standard area matching, in order to suppress a decrease in matching accuracy, it is effective to adaptively change a matching area in accordance with the local properties of an image. However, this requires high calculation costs.

Abstract: The present invention discloses a method comprising: calculating an X separation distance between a left eye and a right eye, said X separation distance corresponding to an interpupilary distance in a horizontal direction; and transforming geometry and texture only once for said left eye and said right eye.

Abstract: In a light projection system, potentially hierarchical levels of light intensity control ensure proper laser-light output intensity, color channel intensity, white point, left/right image intensity balancing, or combinations thereof The light projection system can include a light intensity sensor in an image path, in a light-source subsystem light-dump path, in a light-modulation subsystem light-dump path, in a position to measure light leaked from optical components, or combinations thereof.

Abstract: The disclosure provides a lens module for forming a stereo image. The lens module includes a point light source, a two-dimensional scanning unit, a camera sensor unit, and a data processing unit. The two-dimensional scanning unit is configured for controlling the light from the point light source to project onto an object to obtain image points, which are reflected and arrayed in a matrix on the object and scanning the image points. The camera sensor unit is configured for receiving the light reflected by the object and capturing an image of the image points. The data processing unit is configured for receiving the image from the camera sensor unit and performing an analysis on the image to obtain depth information of the object.

Abstract: A method and an apparatus detect motion, rotation, and tilt for rendering using a sensor in a portable terminal. The rendering method using the sensor in the portable terminal includes pre-rendering a region of a size corresponding to a screen of the terminal and a surrounding region. A preset region of the pre-rendered regions is displayed. A motion of the terminal is detected using a sensor, and a region to display in the pre-rendered regions is changed according to the motion.

Abstract: An image reproducing apparatus for reproducing a stereoscopic image shot by a stereoscopic image capturing apparatus, the image reproducing apparatus comprises: an input unit which inputs image data of the stereoscopic image and additional data recorded in association with the image data; an acquisition unit which acquires depth information indicating a depth of a point of interest in the stereoscopic image set, during shooting, on the basis of the additional data; a generation unit which generates images to be superimposed on right and left images of the stereoscopic image, the images to be superimposed having parallax corresponding to the depth indicated by the depth information, on the basis of the depth information; and a display output unit which combines the right and left images of the stereoscopic image with the images to be superimposed, and outputs the combined right and left images of the stereoscopic image to a display apparatus.

Abstract: The present invention relates to a method and an apparatus for 3-D display based on random constructive interference. It produces a number of discrete secondary light sources by using an amplitude-phase-modulator-array, which helps to create 3-D images by means of constructive interference. Next it employs a random-secondary-light-source-generator-array to shift the position of each secondary light source to a random place, eliminating multiple images due to high order diffraction. It could be constructed with low resolution liquid crystal screens to realize large size real-time color 3-D display, which could widely be applied to 3-D computer or TV screens, 3-D human-machine interaction, machine vision, and so on.

Abstract: An imaging section of a microscope apparatus captures a plurality of microscope images each having the focal position which differs in the field being same with a light flux having passed through a microscopic optical system. A region separating section separates a cellular region from a non-cellular region by using the plurality of the microscope images. A focusing position calculating section finds a focusing position in a target pixel included in the cellular region based on a brightness change in the position being same in the plurality of the microscope images. A three dimensional information generating section generates three dimensional information of a cultured cell based on a position of the cellular region and the focusing position in the target pixel.

Abstract: A method for 3-dimensional vision inspection of objects, such as microelectronic components, which have protrusions as features to be inspected, such as input/output contact balls, is disclosed. The method comprising the steps of determining interior and exterior parameters of a pair of cameras, forming a rectified coordinate system from the parameters of both cameras determined above with a relative pose of second image capturing means with respect to the first image capturing means. A pair of images of the object having a plurality of co-planar protrusions on one surface are captured by the cameras system wherein image coordinates of the images are transformed into coordinates of the rectified coordinate system. Conjugate points of each protrusion are then determined for the measurement of its co-planarity and height. Various configurations of the apparatus for capturing the images and processing the image data are also disclosed.

Abstract: Methods and systems for anonymized video analysis are described. In one embodiment, a first silhouette image of a person in a living unit may be accessed. The first silhouette image may be based on a first video signal recorded by a first video camera. A second silhouette image of the person in the living unit may be accessed. The second silhouette image may be of a different view of the person than the first silhouette image. The second silhouette image may be based on a second video signal recorded by a second video camera. A three-dimensional model of the person in voxel space may be generated based on the first silhouette image, the second silhouette image, and viewing conditions of the first video camera and the second video camera. In some embodiments, information on falls, gait parameters, and other movements of the person living unit are determined. Additional methods and systems are disclosed.

Abstract: A distance measuring apparatus having dual stereo cameras includes a first stereo camera including left and right CMOS image sensors provided on one board and detecting parallax of a reference object to extract distance information, the left CMOS image sensor being spaced apart from the right CMOS image sensor at a predetermined interval, a second stereo camera separated from the first stereo camera at a predetermined distance, including left and right CMOS image sensors provided on one board, and detecting parallax of the reference object to extract distance information, the left CMOS image sensor being spaced apart from the right CMOS image sensor at a predetermined interval, and a depth map matching unit that extracts distance information on the reference object by comparing the distance information on the reference object acquired through the first stereo camera with the distance information on the reference object acquired through the second stereo camera.

Abstract: A stereoscopic image displaying device includes an outer surface that a detection target object approaches; a stereoscopic image generating unit that generates a three-dimensional stereoscopic image based on an input video signal, and a proximity sensor unit that is disposed on a side of the outer surface that is opposite to a side that the detection target object approaches and detects proximity of the detection target object to the outer surface based on a height that is a distance from the outer surface and is set based on parallax information included in the video signal.

Abstract: An image system comprises an image display device which displays images, and image viewing eyeglasses used for viewing images displayed by the image display device.

Abstract: An autostereoscopic display device having a plurality of operating modes for providing different brightness non-uniformity and cross talk display characteristics. The device comprises: an image forming means having an array of display pixels for producing a display, the display pixels being spatially defined by an opaque matrix; and a view forming means arranged in registration with the image forming means and having an array of view forming elements configurable to focus outputs of groups of the display pixels into a plurality of views projected towards a user in different directions, thereby enabling autostereoscopic imaging, wherein a focusing strength of the view forming means is electrically switchable.

Abstract: A video display device includes: a connection detecting module configured to detect whether a shutter glasses is connected to the device; a generation module configured to generate a second frame, which is alternately displayed with a first frame included in a video content, by adding an irregular pattern to an image viewed in a predetermined color when the connection detecting module detects that the shutter glasses is connected; a display unit configured to display the video content; a video display controller configured to control the display unit to alternately display the first frame and the second frame; and a shutter glasses controller configured to control the shutter glasses to close shutters in synchronization with the time for displaying the second frame.

Abstract: A human face detection device includes a photosensitive element, a human face detection unit, and a skin color threshold generation unit. The photosensitive element is used for capturing a first image containing a first human face block. The human face detection unit compares the first image with at least one human face feature, so as to detect the first human face block. The skin color threshold generation unit is used for updating a skin color threshold value according to the detected first human face block. The skin color threshold value is used for filtering the first image signal to obtain a candidate region, the human face detection unit compares the candidate region with the at least one human face feature to obtain the first human face block, and the skin color threshold value determines whether the first human face block detected by the human face detection unit is correct.

Abstract: An exemplary method and system monitors patient safety to, for example, minimize disease transmission from healthcare providers with unclean hands to patients and their surroundings. Signals (for example, infrared and radio frequency) among an area monitor, identification badge, and cleaning agent dispenser help locate and identify objects (persons and equipment). Objects may be identified and monitored using object recognition and motion tracking, zones (around the objects) are defined based on proximity to the object, and subzones are defined within zones to enhance monitoring of compliance with hygiene guidelines. The movements of objects may be monitored using motion tracking, and the objects may be identified by detecting a signal pulse in the object's silhouette. A caretaker entering a zone, moving between subzones, or contacting objects without dispensing cleaning agent from a dispenser can be alerted that they have unclean hands.

Abstract: An eye tracker includes at least one illuminator for illuminating an eye, at least two cameras for imaging the eye, and a controller. The configuration of the reference illuminator(s) and cameras is such that, at least one camera is coaxial with a reference illuminator and at least one camera is non-coaxial with a reference illuminator. The controller is adapted to select one of the cameras to be active to maximize an image quality metric and avoid obscuring objects. The eye tracker is operable in a dual-camera mode to improve accuracy. A method and computer-program product for selecting a combination of an active reference illuminator from a number of reference illuminators, and an active camera from a plurality of cameras are provided.

Abstract: A microscope system is constructed by a light guiding optical system 20 having an objective lens 21 and beam splitters 27a and 27b for splitting an optical image of a sample S, a photodetector 31 for acquiring an image of the sample S, and two CCD cameras 33 and 34 for focus control disposed on optical paths split by the beam splitters 27a and 27b. The cameras 33 and 34 are disposed being inclined with respect to the optical path so that the optical paths thereof in the light guiding optical system 20 vary along a z-axis direction in opposite directions to each other. Images acquired by these cameras 33 and 34 are analyzed in a focus controller 37, and the image pickup focal point to the sample S is controlled on the basis of the analysis result, whereby the focus control when an image of the sample is acquired can be suitably performed.

Abstract: An apparatus for inspecting pattern defects, the apparatus including: an image acquisition unit which acquires an image of a specimen and stores the acquired image in an image memory; a defect candidate extraction unit which performs a defect candidate extraction process by using the acquired image, which is read from the image memory; and a defect detection unit which performs a defect detection process and a defect classification process based on a partial image containing a defect candidate that is extracted by the defect candidate extraction unit, wherein the processes performed by the defect detection unit is performed off-line asynchronously with an image acquisition process that is performed by the image acquisition unit.

Abstract: To coordinate a coherent view across multiple display devices having an arbitrary physical layout, display offsets are determined by a computing platform based on image information received from a camera coupled to the computing platform. The computing platform may apply edge detection algorithms to determine relative positions, orientations and sizes of each of the multiple display devices from which display offsets associated with each display device may be derived as configuration settings for use in a subsequent rendering of a views to be displayed across the display devices.

Abstract: Disclosed is an underwater CCD camera for visual testing of a reactor cooling system. The underwater CCD camera includes a CCD camera, a casing having a supporter supporting the CCD camera and a cooling pin on a top surface thereof, a Pb-glass window on a front side of the easing to shield the CCD camera from radiation and to reduce a temperature difference between the interior and exterior of the casing, a sealing O-ring preventing a coolant from being introduced into a gap between the Pb-glass window and the casing, a sealing nut providing a fastening force to bring the Pb-glass window into close contact with the sealing O-ring, a rear cap, a silicon O-ring preventing the coolant from being introduced into a gap between the rear cap and the casing, and a fastening nut providing a fastening force to prevent leakage between a camera cable and the casing.

Abstract: A support stand includes a support member, and a connecting module assembled on the support member. The connecting module includes a first adjustment member, a first connection member rotatably connected to the first adjustment member, a second adjustment member assembled on the support member, a second connection member rotatably connected to the second adjustment member, and a fixing member connecting the first adjustment member and the second connection member. The connecting module further includes two first clamping members assembled on the first adjustment member to clamp the first connection member, and two second clamping members assembled on the second adjustment member to clamp the second connection member. The first and second clamping members are capable of adjusting the rotating angle of the first and second connection member around a first and second axis, respectively. An imaging measurement device utilizing the support stand is also provided.

Abstract: A control unit may automatically enable and/or disable a washing apparatus based on processing of an image of wares to be washed by the washing apparatus. In one example, a system includes a camera configured to capture an image of one or more wares to be washed by a washing apparatus, a computer-readable medium comprising a plurality of item profiles, each of the item profiles comprising a visual signature and one or more wash cycle characteristics, and a control unit configured to retrieve the image, detect one of the visual signatures of the plurality of item profiles in the image, select the one of the item profiles corresponding to the detected visual signature, enable the washing apparatus, and automatically disable the washing apparatus after the ware is determined to be clean in accordance with the selected one of the item profiles.

Abstract: A position measuring system includes a marker set having three or more basic markers that are known in positional relation and attached to a second area of an object which contains a first area having an acting portion and the second area continuous with the first area, an image-taking device having a two-dimensional image-taking element that takes an image of the marker set, a recording device that records the coordinate of the acting portion with respect to the marker set, and a processing device that calculates the three-dimensional position of the acting portion by using the position and angle of the marker set determined on the basis of the image of the marker set taken by the image-taking device and the coordinate of the acting portion with respect to the marker set that is recorded in the recording device.

Abstract: A computer-implemented method for matching objects is disclosed. At least two images where one of the at least two images has a first target object and a second of the at least two images has a second target object are received. At least one first patch from the first target object and at least one second patch from the second target object are extracted. A distance-based part encoding between each of the at least one first patch and the at least one second patch based upon a corresponding codebook of image parts including at least one of part type and pose is constructed. A viewpoint of one of the at least one first patch is warped to a viewpoint of the at least one second patch. A parts level similarity measure based on the view-invariant distance measure for each of the at least one first patch and the at least one second patch is applied to determine whether the first target object and the second target object are the same or different objects.

Abstract: A projector (1) for imaging an original image on a projection area (5) includes projection optics (2) having an adjustable image width (L) for imaging the original image on the projection area (5). A camera device (6) is used for imaging the projection area (5) and generating a projection area image. A comparison device (12) compares the original image with the projection area image and adjusts the image width (L) of the projection optics (2) as a function of the comparison such that the comparison device (12) is configured to determine the position of the original image in the projection area image. The position of the original image in the projection area image is then used as a measure for determining the image width of the projection optics (2).

Abstract: The invention relates to a shape measuring device and method, and a program therefor, that allow measuring the shape of a test object, more simply and reliably, using a single-chip color sensor. An optical low-pass filter (24) expands a slit beam reflected on a test object (12), in a direction perpendicular to a baseline direction. A CCD sensor (25) has R, G and B pixels arranged in a Bayer array, and the CCD sensor (25) outputs image signals that are obtained by the pixels receiving the slit beam. On the basis of image signals of the G pixels, an image processing unit (26) detects the timing at which the slit beam passes over a site of the test object (12) that is pre-set for the G pixels and, on the basis of image signals of the R pixels and the B pixels, controls a projection unit (22) to adjust the intensity of the slit beam. A dot group computing unit (27) computes the position of the test object (12) on the basis of the timing detected for the G pixels.

Abstract: There is provided a method of localizing an object comprising projecting an object located on an object plane and a reference point corresponding thereto on a virtual viewable plane and an actual camera plane; estimating coordinates of the reference point; and prescribing a relationship between a location of the object and the coordinates of the reference point.

Abstract: An apparatus, method and software construct an image of a scene by determining distance information to an object in a scene; and using the distance information to correct parallax error when combining at least two images of the object which were captured from different viewpoints. A single image of the scene from the combining is then output, with the object corrected for parallax error. In one embodiment the distance information is input from an autofocus mechanism of a multi-camera imaging system, and in another the distance information is derived from one of an object recognition algorithm or a scene analysis algorithm. The two (or more) images that are combined are captured preferably on different lenslet cameras of the same multi-camera imaging system, each of which sees the object in the scene from a different viewpoint.

Abstract: An apparatus for acquiring distance information and images includes an image sensor unit including a left image sensor, a central image sensor, and a right image sensor, which are arranged on one board while being spaced apart from one another at a predetermined interval, and a distance information extraction unit that extracts distance information by comparing an image of a reference object acquired through the central image sensor with an image of the reference object acquired through the left image sensor and an image of the reference object acquired through the right image sensor.

Abstract: Handheld communications devices include a communications port, at least one battery, and processing circuitry configured to automatically determine a network address of a network node connected to the communications port, to communicate with the network node using the determined network address, and to consume energy stored by the battery. Communications methods include using a handheld communications device connected to a network node, automatically determining a network address of the network node; using the handheld communications device, communicating with the network node using the determined network address; and based on the communicating and using the handheld communications device, verifying that the network node is operational.

Abstract: An encoding apparatus of a video security system in which a stream to be stored in a storage medium and a stream to be transmitted through a network may be simultaneously or separately generated using one encoding chip. The encoding apparatus includes an image encoding unit which encodes an input image, received from a surveillance camera, selectively under at least one of an advanced video coding (AVC) scheme complying with an H.264/AVC standard to generate and store an AVC-encoded image in a storage medium, and a scalable video coding (SVC) scheme complying with the H.264/AVC standard to generate and transmit an SVC-encoded image to a network.

Abstract: In addition to the clear advantages of video monitoring systems for securing monitoring regions and optionally for following suspicious objects, there is the requirement to secure the private environments of people in the regions being monitored. A masking module (4) for a monitoring system (1) is disclosed for the above, wherein the monitoring system (1) has at least one monitoring camera (2) designed and/or arranged for observing monitoring regions with moving objects (14, 16), comprising a selection device for selecting objects as selected objects (16), wherein the masking module (4) is designed to output the selected objects (16) or partial regions thereof subsequently together called selected objects (16) in a masked form, wherein the masking module (4) is designed to limit the masking of objects (16) to at least one selected physical partial region (15, 18) of the monitoring region.

Abstract: A method for locking communication between at least one wireless input capture device ICD(s) and a corresponding digital input recorder (DIR) and/or another ICD, including the steps of providing base system; at least one user accessing the DIR via user interface either directly or remotely; the DIR and/or ICD searching for signal from the ICD(s) and establishing communication with them; and locking the ICDs to send wireless data exclusively to that DIR and/or ICD; and/or the DIR and/or ICD locking itself for exclusive communication with the locked ICDs, thereby providing a secure surveillance system for a target environment.

Abstract: Systems, devices, features, and methods for detecting common geographic features in images, such as, for example, to develop a navigation database are disclosed. For example, a method of detecting a common text pattern, such as for a road or path sign, from collected images includes collecting a plurality of images of geographic areas along a road or path. An image of the plurality of images is selected. Components that correspond to an object about the road or path in the selected image are determined. In one embodiment, the determined components are independent or invariant to scale of the object. The determined components are compared to reference components in a data library. If the determined components substantially match the reference components, the object in the selected image is identified to be a common pattern, such as for a standard road or path sign, corresponding to the reference components in the data library.

Abstract: A vehicle-mounted system (1010) for recording video and audio. The system (1010) uses distributed processing, including encoding the video and audio at their source(s), and a high-speed, e.g., Ethernet, bus (1148) connecting the various system components and external devices. The system (1010) may include a display monitor (1040) which is integrated into the same housing (1020) as a rear view mirror (170) of the vehicle, with the display monitor (1040) being located behind the mirror (170) and video displayed on the monitor being visible through the mirror (170).

Abstract: A car-mount traffic condition surveillance device includes an image acquisition unit, a control unit, an input unit, an image display unit, and a power supply unit. The image acquisition unit includes first and second image acquisition units for respectively acquiring images of street corners or lane entrances closely located in front of the left and the right side of the car. The input unit can send an actuating signal for the control unit to transmit the images acquired by the first and second image acquisition units to the image display unit for displaying on a split screen, allowing the drive to view the images at the same time so as to avoid collision of the car with another car unexpectedly coming out from any of the street corners or lane entrances.

Abstract: Techniques are provided for converting live presentations into electronic media and managing captured media assets for distribution. An exemplary system includes capture devices that capture media assets of live presentations comprising a session, including image data of sequentially presented visual aids accompanying the live presentations and audio data. Each capture device has an interface for real-time image data marking of the image data for identification of individual images and session marking of the image data for demarcation of individual presentations of the session. A centralized device processes the captured media assets and automatically divides the captured media assets into discrete files associated with the individual presentations based on the session markings. An administrative tool manages the processed media assets to produce modified presentations and enables modification of the visual aid images identified by the image data markings.