Methods and apparatus for detecting and reducing color errors in images

Display apparatus, and methods for displaying images, e.g., text, on gray scale and color monitors where each pixel includes multiple pixel sub-components are described. Filtering and/or displaced sampling is used to generate pixel sub-component luminous intensity values. As a result of treating pix...

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Bibliographische Detailangaben
Hauptverfasser:	LUI CHARLTON E, CUKIERMAN RYAN E, HITCHCOCK GREGORY C, KEELY, JR. LEROY B
Format:	Patent
Sprache:	eng
Schlagworte:	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 ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY FREQUENCY-CHANGING IMAGE DATA PROCESSING OR GENERATION, IN GENERAL NON-LINEAR OPTICS OPTICAL ANALOGUE/DIGITAL CONVERTERS OPTICAL LOGIC ELEMENTS OPTICS PHYSICS PICTORIAL COMMUNICATION, e.g. TELEVISION SEALS TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF
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Beschreibung
Zusammenfassung:	Display apparatus, and methods for displaying images, e.g., text, on gray scale and color monitors where each pixel includes multiple pixel sub-components are described. Filtering and/or displaced sampling is used to generate pixel sub-component luminous intensity values. As a result of treating pixel sub-components as distinct light emitters corresponding to different image portions, resolution is enhanced but color errors may be introduced into the image being displayed. Various techniques for detecting noticeable and/or distracting color errors are described. In addition, various techniques for correcting, compensating for, or reducing color errors are described. In one particular embodiment, red, green and blue pixel sub-component luminous intensity values are examined and compared to a range of luminous intensity values which is determined as a function of utilized foreground and background pixel colors. Pixel sub-component luminous intensity values which are determined to be outside the range of acceptable values are adjusted to fall within the range of acceptable values. In one particular embodiment, individual pixel sub-component luminous intensity values outside the range of acceptable values are clamped to the nearer of the foreground or background pixel sub-component luminous intensity value of the correspondingly colored pixel sub-component. In another embodiment sequential red and blue filters are used to reduce or compensate for color distortions.