METHODS AND APPARATUS FOR OPTICALLY ENHANCING SELECTED FEATURES IN AN INPUT IMAGE

Features of an input image (10) having a predetermined brightness level are optically enhanced in the output image (34 min ) relative to other parts of the input image having a brightness level greater or less than the predetermined level. The input image (10) is displayed on a liquid crystal displa...

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Bibliographic Details
Main Author HARWARD, CHARLES N
Format Patent
LanguageEnglish
Published 17.07.1991
Edition5
Subjects
ADVERTISING
ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICESUSING STATIC MEANS TO PRESENT VARIABLE INFORMATION
CALCULATING
COMPUTING
COUNTING
CRYPTOGRAPHY
DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING
DISPLAY
EDUCATION
FREQUENCY-CHANGING
IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
NON-LINEAR OPTICS
OPTICAL ANALOGUE/DIGITAL CONVERTERS
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICAL LOGIC ELEMENTS
OPTICS
PHYSICS
SEALS
TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF
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Summary:Features of an input image (10) having a predetermined brightness level are optically enhanced in the output image (34 min ) relative to other parts of the input image having a brightness level greater or less than the predetermined level. The input image (10) is displayed on a liquid crystal display (20) by conventional means including a video camera (12) with associated exposure and brightness controls (36). Light from a light source (22), polarized by a first polarizer (24), illuminates the display (20). Light transmitted by the display is polarized by a second polarizer (28) and displayed as the output image (34 min ). By controlling the angle of the polarization axes (26,30) of the polarizers (24,28) and the brightness of the input image (10), selected features of the input image may be made brighter or darker than other features of the input image in the output image (34 min ). Such method and apparatus has particular application in inspection of printed goods where selected portions of a printed area may be made to stand out to allow inspection for accuracy and alignment of the printing.
Bibliography:Application Number: EP19890312043