Abstract: A method and structure for determining overall lightness contrast of an image includes extracting pixel values from the image, calculating an image edge contrast based on the pixel values, calculating an area contrast based on the pixel values, calculating image range based on the pixel values, calculating relative average lightness based on the pixel values, and calculating the overall lightness contrast of the image by combining the edge contrast, the image range, the area contrast and the relative average lightness.

Abstract: A method and structure for determining overall lightness contrast of an image includes extracting pixel values from the image, calculating an image edge contrast based on the pixel values, calculating an area contrast based on the pixel values, calculating image range based on the pixel values, calculating relative average lightness based on the pixel values, and calculating the overall lightness contrast of the image by combining the edge contrast, the image range, the area contrast and the relative average lightness.

Abstract: The present invention automatically and quickly digitizes small format films, such as dental radiographs, and processes digital images. The radiographs are scanned using a flat-bed scanner with a transparency adapter. A template is used during image capture to assist in proper exposure during the digitization step to minimize undesired flare. Exposure levels are adjusted to accommodate the wide variability that can be found in processed films. A user interface is provided that will automatically bound the region of the platen to be scanned so that image processing can be accommodated on an image by image basis. An image tonescaling algorithm is implemented to render the image for soft copy display on an electronic display or other output device.

Abstract: The present invention automatically and quickly digitizes small format films, such as dental radiographs, processes digital images, and provides a means for digital image authentication. The radiographs are scanned using a flat-bed scanner with a transparency adapter. A template is used during image capture to assist in proper exposure during the digitization step to minimize undesired flare. Exposure levels are adjusted to accommodate the wide variability that can be found in processed films. A user interface is provided that will automatically bound the region of the platen to be scanned so that image processing can be accommodated on an image by image basis. An image tonescaling algorithm is implemented to render the image for soft copy display on an electronic display or other output device.

Abstract: A template for positioning small format films on the platen of a flatbed scanner for reducing flare during scanning, the template comprising: a thin rectangular member of opaque material, the member having a plurality of rectangular apertures for receiving small format films; and indicia associated with each aperture for assisting in the proper placement of a small format film in the aperture.

Abstract: The present invention efficiently and quickly estimates signal (code value) dependant noise in an image and subsequently reduces that noise. The digital image is segmented both according to code value and into smooth vs. textured regions. Noise estimates taken from smooth regions are used to model noise as a function of code value. The predictions of the model are used to tone noise reduction in all areas of the image according to the appropriate code value.