Apparatus for controlling display and method for gradation conversion
AssigneeSony Corporation
InventorsHiroshi Doihara, Hirotaka Sakaguchi, Hajime Terada
Life of this patent
Estimating the term…
Abstract
Brightness of input data ranging from 0 to 20% (brightness close to black) is converted to gradation Y0 (black) and brightness ranging from 80 to 100% (brightness close to white) is converted to gradation Y7 (white). Ranges of brightness from 20 to 35%, 35 to 45%, 45 to 50%, 50 to 55%, 55 to 65%, and 65 to 80% are converted to gradations Y1 to Y6, respectively. While brightness of the input data is converted to eight gradations which an LCD can display, intervals of brightness assigned to each of gradations are so specified that they are narrower around medium brightness (around 50%) than around the minimum (0%) or maximum (100%) brightness, i.e., the conversion is performed in a nonlinear manner.
Claims9
An apparatus for controlling a display, the apparatus comprising:
- data storage means for storing video data corresponding to an image to be displayed;
- gradation conversion means for converting said video data to data having a predetermined number of gradations each respectively corresponding to a predetermined gradation range, with a nonlinear characteristic such that gradation ranges are denser around a medium gradation than around maximum and minimum gradations;
- and
- output means for outputting said video data converted to data having a predetermined number of gradations by said gradation conversion means.
A method for gradation conversion comprising the steps of:
- converting color data to luminance data;
- and
- converting said luminance data to data having a predetermined number of gradations each respectively corresponding to a predetermined gradation range, with a nonlinear characteristic such that gradation ranges are denser around a medium gradation than around a maximum or a minimum gradation;
- and
- programmably providing a variety of nonlinear gradation characteristics.
An apparatus for processing brightness data for display which can display a video image having brightness values between a minimum brightness and a maximum brightness, the apparatus comprising:
- data storage means for storing a plurality of input brightness values for the video image;
- gradation conversion means for converting each input brightness value to a one of a set of predetermined gradated brightness values, such that each predetermined gradated brightness value corresponds to a predetermined range of input brightness values, the predetermined gradated brightness values occur at regular intervals between the minimum and maximum brightness values, and the predetermined ranges of input brightness values are not evenly distributed between the minimum and maximum brightness values;
- and
- output means for outputting the brightness values which have been converted to gradated brightness values by the gradation conversion means.
An apparatus for processing color data for display which can display a video image having luminance values between a minimum luminance and a maximum luminance, the apparatus comprising:
- data storage means for storing a plurality of input color values for the video image;
- luminance conversion means for converting the plurality of input color values to a plurality of input luminance values;
- gradation conversion means for converting each input luminance value to a one of a set of predetermined gradated luminance values, such that each predetermined gradated luminance value corresponds to a predetermined range of input luminance values, the predetermined gradated luminance values occur at regular intervals between the minimum and maximum luminance values, and the predetermined ranges of input luminance values are not evenly distributed between the minimum and maximum brightness values;
- and
- output means for outputting the luminance values which have been converted to gradated luminance values by the gradation conversion means.
Dependencies are inferred from the claim text.