Abstract: Display systems, control systems for a display and a method for operating a display are provided in which people are detected a presentation space within which content presented by the display can be observed. Viewing areas are defined for each person with each viewing area comprising a less than all of the presentation space and including an area corresponding to each person. One channel of image content is obtained for presentation to each person and a combination image is presented on the display. The combination image is modulated so that each area of the combination image presented by the display is viewable only in selected areas of the presentation space. The combination image has image content from each channel of image content arranged in areas of said combination image so that, when modulated, the image content from each channel of image content is viewable only in a viewing area defined for the person for whom the content is obtained.

Abstract: A method is taught for measuring magnification of an afocal optical system.

Abstract: A method is taught for measuring magnification of an afocal optical system.

Abstract: A lenticular image product comprising: a lenticular material having an array of lenticules with cylindrical lenses; and a lenticular image associated with the lenticular material, the lenticular image having an original image having a wide angle view and at least one final image having a narrow angle view created from the original image, such that tilting of the lenticular image product produces a zoom effect between the original and final images.

Abstract: A lenticular image product comprising: a lenticular material having an array of lenticules with cylindrical lenses; and a lenticular image associated with the lenticular material, the lenticular image having an original image having a wide angle view and at least one final image having a narrow angle view created from the original image, such that tilting of the lenticular image product produces a zoom effect between the original and final images.

Abstract: A method suitable for determining large petal piston in a segmented imaging assembly. The assembly preferably comprises a polychromatic source of radiation that can output a polychromatic radiation beam; and, a segmented imaging system including petals comprising a reference component and a test component, which components can be used to form an imaged radiation beam. The method steps comprise intercepting preselected portions of the imaged radiation beam with a mask comprising two apertures, so that one aperture is dedicated to radiation imaged by the reference component, and the second aperture is dedicated to radiation imaged by the test component, thereby creating a real time masked image; and, interrogating an envelope and a fine structure spacing of the real time masked image, as a measure of the large petal piston of the segmented imaging system.

Abstract: A method suitable for determining piston in a segmented imaging assembly. The assembly preferably comprises a source of radiation that outputs a radiation beam; and, a segmented imaging system comprising a reference component and a test component, which components can be used to form an imaged radiation beam. The method comprises the steps of intercepting preselected portions of the imaged radiation beam with a mask, for masking at least one portion of at least one of the reference component and the test component, so that a portion of the imaged radiation beam incurs a predetermined and differential phase retardation, relative to another portion of the beam passing through the mask. These actions create a real time masked image. A step of comparing the real time masked image against a family of off-line images generated for a sequence of known petal position errors, can provide a determination of the magnitude of the real time test component piston.

Abstract: A method for simultaneously determining coarse and fine petal piston in a segmented imaging assembly. The assembly preferably comprises a source of radiation that outputs a radiation beam; and, a segmented imaging system comprising a reference component and a test component, which components can be used to form an imaged radiation beam. The method comprises a first step of intercepting preselected portions of the imaged radiation beam with a novel composite mask. The composite mask comprises apertures which are dedicated to coarse petal alignment, and four phase retardation regions dedicated to fine petal alignment. The first step creates a real time masked image. A step of comparing the real time masked image against a family of off-line images generated for a sequence of known petal position errors, can provide the magnitude of the fine piston, while a step of interrogating an envelope and a fine structure spacing of the real time masked image, can provide the magnitude of the coarse piston.

Abstract: A novel composite imaging mask suitable for employment in a method for simultaneously determining coarse and fine petal piston in a segmented imaging assembly. The mask comprises a transparent substrate comprising two spaced-apart apertures, which apertures are dedicated to coarse petal alignment; a first overlay deposited on a face of the substrate, for defining four phase retardation regions dedicated to fine petal alignment; a second overlay comprising an opaque coating, the second overlay deposited on the face of the substrate and complementary to the four phase retardation regions and the apertures, and a means for spirally separating the coarse and fine alignment entities.

Abstract: A rectangular sample cell for use in the measurement of the light scattered from an incident light beam in three mutually orthogonal directions is constructed with a prism having its base optically in contact with the sample along a side of the cell. Two other faces of the prism are oriented at equal angles to the base so that those faces pass orthogonal components of the light scattered at 90.degree. from the axis of the incident beam. The other orthogonal component is formed by the forward scattered light.

Abstract: A histogram of the volume of the particles in a sample of fluid-suspended particles, including those in the submicron region, can be obtained by using an incident light beam having a wavelength approximately twice the average particle diameter in each of the ranges of particle sizes making up the histogram. The 90.degree. scatter from the sample is measured in two orthogonal polarizations. The first polarization has its electric vector perpendicular to the plane containing the point of observation and the incident light beam and the second is parallel to that plane. The magnitude of the light flux having the second polarization is subtracted from that having the first polarization in each range to give a measure of the volume of the particles in that range.

Abstract: A rotating mask having three spatial filters is placed in the light path after a laser beam is passed through a sample having a collection of particles. The mask sequentially filters the light scattered by each particle to produce at a detector receiving the filtered light a response which is in accordance with the second, third and fourth power of the particle diameter. The detector integrates the response to all particles in the laser beam and the signal resulting from the integration of the response due to the individual filters is used to calculate statistical parameters. The mean of the area distribution is calculated as the third power response divided by the second power response.