Image processing apparatus

• US 5,907,643 A
• Filed: 02/05/1997
• Issued: 05/25/1999
• Est. Priority Date: 06/30/1993
• Status: Expired due to Fees

• Current Assignee: Shimadzu Corporation
• Original Assignee: Shimadzu Corporation
• Inventors: Adachi, Susumu
• Primary Examiner(s): COUSO, YON JUNG
• Application Number:
  US08/795,780
• Time in Patent Office: 839 Days
• Field of Search: 382/312, 382/319, 382/100, 358/471, 358/474
• US Class Current: 382/312
• CPC Class Codes: H04N 25/672 between adjacent sensors or output registers for reading a single image
• CPC Class Codes: H04N 25/677 for reducing the column or line fixed pattern noise
• CPC Class Codes: H04N 25/68 applied to defects
• CPC Class Codes: H04N 5/32 Transforming X-rays cameras or camera modules for generating image signals from X-rays H04N23/30; circuitry of SSIS for transforming X-rays into image signals H04N25/30

Abstract

An apparatus for processing a two-dimensional image obtained by scanning sensor arrays of image detectors perpendicular thereto, the apparatus including an image memory for storing pixel data output by the image detector as a two-dimensional image, a first read-out unit for reading the stored pixel data about a particular detector in a particular array, a second read-out unit for reading pixel data in the neighborhood of the pixel data read by the first read-out unit, a first arithmetic unit for measuring the magnitude of difference in sensitivity between the detector whose pixel data is read by the first read-out unit and the detector whose pixel data is read by the second read-out unit, and a second arithmetic unit for compensating for the deficiency of sensitivity on the basis of the output of the first arithmetic unit.

Claims

1. An apparatus for processing a two-dimensional image obtained by scanning sensor arrays of image detectors perpendicular thereto, the apparatus comprising:

an image memory for storing pixel data output by the image detector as a two-dimensional image;

a first read-out means for selectively reading the stored pixel data about a particular detector in a particular array, said first read-out means selectively reading the stored pixel data in whole or in part;

a second read-out means for selectively reading neighborhood pixel data in whole or in part in the neighborhood of the pixel data read by the first read-out means;

a comparing arithmetic means for measuring the magnitude of difference in sensitivity between the detector whose pixel data is read by the first read-out means and the detector whose pixel data is read by the second read-out means; and

a calculating arithmetic means for compensating for the deficiency of sensitivity on a basis of the output of the comparing arithmetic means.

2. The apparatus according to claim 1, further comprising a first counter and a second counter both connected to the image memory, wherein the first counter indicates the position of the pixels along the array to which they belong and the second counter indicates the position of the pixels in a direction in which the arrays are scanned.

3. An apparatus for processing a two-dimensional image obtained by scanning sensor arrays of image detectors perpendicular thereto, the apparatus comprising an image memory for storing pixel data output by the image detector as a two-dimensional image, a first read-out means for reading the stored pixel data about a particular detector in a particular array, a second read-out means for reading pixel data in the neighborhood of the pixel data read by the first read-out means, a first arithmetic means for measuring the magnitude of difference in sensitivity between the detector whose pixel data is read by the first read-out means and the detector whose pixel date is read by the second read-out means, a second arithmetic means for compensating for the deficiency of sensitivity on the basis of the output of the first arithmetic means, and a second memory interposed between the first arithmetic means and the second arithmetic means, the second memory storing the magnitude of difference in sensitivity measured by the first arithmetic means as a compensating value for the less sensitive detector.