Hyperacuity sensing

• US 5,541,652 A
• Filed: 04/21/1995
• Issued: 07/30/1996
• Est. Priority Date: 11/12/1993
• Status: Expired due to Term

• Current Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Original Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Inventors: Biegelsen, David K., Jackson, Warren B.
• Primary Examiner(s): NOT, DEFINED
• Assistant Examiner(s): Shalwala, Bipin
• Application Number:
  US08/426,439
• Time in Patent Office: 466 Days
• Field of Search: 348/218, 348/241, 348/252, 348/332, 348/625, 348/627, 348/26, 348/294, 257/656, 257/291, 257/458, 257/459, 257/444, 257/448, 382/192-195
• US Class Current: 348/332
• CPC Class Codes: H04N 25/00 Circuitry of solid-state image sensors [SSIS]; Control thereof
• CPC Class Codes: H04N 25/50 Control of the SSIS exposure
• CPC Class Codes: H04N 25/76 Addressed sensors, e.g. MOS or CMOS sensors
• CPC Class Codes: H04N 3/1512 for MOS image-sensors, e.g. MOS-CCD H04N3/1581 takes precedence
• CPC Class Codes: H04N 3/155 Control of the image-sensor operation, e.g. image processing within the image-sensor

Abstract

Methods and devices for implementing hyperacuity sensing are provided. The imaging device comprises a sensor array including sensor elements, each of which provides intracellular spatial intensity distribution information necessary to render images with subpixel accuracy. The method includes the step of hyperacuity sensing implemented using sensors that output signals that are dependent upon the internal intensity distribution of impinging light. The output signals are processed to determine the internal intensity distribution, which can then be used to produce a hyperacuity image. Such a hyperacuity image has enhanced definition of edges, and reduced artifacts such as jaggies and moire effects.

Claims

1. A sensor assembly for constructing

a hyperacuity approximation of an image, the sensor assembly comprising

a plurality of sensor elements positioned in an imaging array, with each sensor element in the imaging array having a defined area of less than one square centimeter for detecting incident radiation to provide a first output representative of total incident radiation intensity on each defined area, and

a plurality of radiation detectors, with at least one radiation detector positioned within each defined area of each of the plurality of sensor elements in the imaging array, the at least one radiation detector in each defined area providing a second output approximating an intensity distribution of incident radiation within each of the defined areas of the plurality of sensor elements, with the first and second outputs together used to construct said hyperacuity approximation of the image.

2. The array according to claim 1, wherein the second output from the at least one radiation detector can be converted into an approximation of an edge position of the incident radiation within each of the defined areas of the plurality of sensor elements.

3. The array according to claim 1, wherein each of the plurality of sensor elements are sensitive to light radiation.

4. The array according to claim 2, wherein the second output further comprises output from four radiation detectors positioned within each of the defined areas of the plurality of sensor elements.

5. The array according to claim 1, wherein each of the plurality of sensor elements are sensitive to electron radiation.

6. The array according to claim 2, wherein the sensor elements have hexagonal shape.

7. The array according to claim 3, wherein each of the plurality of sensor elements are hexagonally arranged in the imaging array.