Abstract: Various aspects of the instant disclosure are directed to imaging tissue. As may be implemented in accordance with one or more embodiments, aspects of the present disclosure are directed to apparatuses and methods involving the following. A light source includes an array of light emitters that illuminate a tissue region of a heart wall with light at different wavelength ranges. A light collector collects multispectral images including respective images collected at each of the different wavelength ranges at which the tissue region is illuminated. A catheter positions the light source and light collector proximate the tissue region of the heart wall for respectively illuminating the tissue region and collecting the multispectral images. A display circuit collects and displays one or more images depicting a condition of the health of heart wall tissue, based on the respective images collected at the different ones of the wavelength ranges.

Abstract: Embodiments are directed to apparatuses and methods that jointly estimate reflectance and fluorescence spectra. An example embodiment includes providing captured intensity characteristics indicative of a target, the intensity characteristics acquired by illuminating the target with different illuminants and passing light in different spectral bands via a photodetector apparatus and providing reflectance properties and fluorescent properties of the target. The example embodiment further includes concurrently adjusting the reflectance properties and fluorescence properties to reduce a quantity indicative of a combination of: a difference between the captured intensity characteristics and intensities predicted using an image formation model incorporating the reflectance properties and fluorescence properties, functions of the reflectance properties, and functions of the fluorescence properties.

Abstract: Various aspects of the instant disclosure are directed to imaging tissue. As may be implemented in accordance with one or more embodiments, aspects of the present disclosure are directed to apparatuses and methods involving the following. A light source includes an array of light emitters that illuminate a tissue region of a heart wall with light at different wavelength ranges. A light collector collects multispectral images including respective images collected at each of the different wavelength ranges at which the tissue region is illuminated. A catheter positions the light source and light collector proximate the tissue region of the heart wall for respectively illuminating the tissue region and collecting the multispectral images. A display circuit collects and displays one or more images depicting a condition of the health of heart wall tissue, based on the respective images collected at the different ones of the wavelength ranges.

Abstract: A system for distributing digital content over a computer network (e.g., the Internet) uses certificates to establish a trust relationship between a content provider and a display device. The certificates identify the display device and the content provider as well as unique characteristics of the distribution. For example, the content provider may be a book publisher and the display device may be a printer/binder.

Abstract: A system for distributing digital content over a computer network (e.g., the Internet) uses certificates to establish a trust relationship between a content provider and a display device. The certificates identify the display device and the content provider as well as unique characteristics of the distribution. For example, the content provider may be a book publisher and the display device may be a printer/binder.

Abstract: An Active Pixel Sensor (APS) system is provided with photosensing circuitry for providing a photosignal related to an intensity of incident light on a pixel during an exposure period and converting circuitry operatively connected to said photosensing circuitry to provide an intensity-time signal in a first duration or second duration during the exposure period in response to incident light of a respective first or second range of intensities and to respond to the intensity-time signal to provide a first digital count or a sum of first and second digital counts related to the intensity of the incident light of the respective first or second range of intensities.

Abstract: A color image editing system and method uses sensor responses in an image capture device to estimate and separate illuminant and surface reflectance in a scene. The system uses the estimated surface reflectances, along with a desired illuminant SPD, to calculate the corresponding XYZ values. To render the images on an imaging device, the XYZ values are converted into device-dependent display or printer values. The image data may be manipulated in a manner that is intuitive to humans, such as correcting the image data according to changes in lighting and surface color.An image capture device, such as a scanner or digital camera, represents a scene as image data that is resolved as device-dependent channels, such as RGB. For each channel, the spectral reflectances of the surfaces within the scene are described reflectance functions that are independnt of the lighting function that describes the illuminant spectral power distribution (SPD).

Abstract: A method and an apparatus to reduce the errors in linearly transforming the RGB values to the XYZ values of the colors of an image. The image is measured twice, once with and once without a filter between the image and the sensors measuring the image. The apparatus is capable of generating at least three output values substantially simultaneously to measure the color of each element of the image.