Browse Prior Art Database

Photographic Image Computer Analyzer

IP.com Disclosure Number: IPCOM000062503D
Original Publication Date: 1986-Dec-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Abraham, DG: AUTHOR [+2]

Abstract

A photographic image computer analyzer electronically scans a color image and generates data representing the intensity of each of the red (R), green (G) and blue (B) color values of any picture element (pixel). The data is stored, corrected or modified as desired, and used to drive a color CRT to project a superimposed enhanced image for viewing or for projection onto a printing medium. Using a standard photographic enlarger as an example, an RGB color CRT is placed in the lamp housing to emit red, blue, green, or white light to the film image to be enlarged. An image analyzer is placed in the focal plane of the projected image, such as on the enlarging easel underneath the light beam.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 52% of the total text.

Page 1 of 2

Photographic Image Computer Analyzer

A photographic image computer analyzer electronically scans a color image and generates data representing the intensity of each of the red (R), green (G) and blue (B) color values of any picture element (pixel). The data is stored, corrected or modified as desired, and used to drive a color CRT to project a superimposed enhanced image for viewing or for projection onto a printing medium. Using a standard photographic enlarger as an example, an RGB color CRT is placed in the lamp housing to emit red, blue, green, or white light to the film image to be enlarged. An image analyzer is placed in the focal plane of the projected image, such as on the enlarging easel underneath the light beam. The analyzer is a linear array of optically sensitive devices, such as charge-coupled devices, which provide an analog output signal in response to the incident light. The analyzer traverses the focal plane of the projected image on three separate passes while the RGB tube successively uses each of the red, green, and blue electron guns to project the particular color on the face of the tube. To capture the image, the position of the scanner is electronically sensed and the analog value of the incident light for each pixel position is digitized and sent to the microprocessor. The image data for each color for each position is stored in a three-layer matrix. A composite exposure value is made by adding the interplane dimensions at their common x, y coordinates, i.e., the green plus blue plus red, to provide a white light exposure value. The color data and white data are stored as raw image data. Corrections for degradation caused by lens systems, chromic aberations, edge effects, etc., are measured by comparing the system response to each of the individual...