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US 9,520,104 B2Granted
Image display device and LUT adjustment method
AssigneeFunai Electric Co., Ltd.
InventorYuya Nakamura
Life of this patent
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Abstract
An image display device includes a microcomputer and LUTs which are tables of correction data used to correct color balance of images. The microcomputer sets LUT extensions and calculates the LUTs based on: (1) the normalized values GainLn of the L conforming adjustment values GainL and the normalized values GainHn of the H conforming adjustment values GainH; (2) the normalized values Lin of the input values Liref of the image data of the L adjustment image and the normalized values Hin of the input values Hiref of the image data of the H adjustment image; (3) the correction data of the LUTs; and (4) the correction data of the LUT extension units.
Claims20
An image display device comprising:
- an input value adjustment unit, defined by an image processor, which applies a gain or offset to input values of image data;
- a LUT which is a table of correction data used to correct the input values of image data having a gain or offset applied thereto by the input value adjustment unit and which is a table indicating a relationship between LUT input values that are uncorrected values and LUT output values that are corrected values of the LUT input values;
- a display which displays images based on the input values of the image data that have been corrected based on the LUT correction data;
- a conforming adjustment value acquisition unit which acquires conforming adjustment values, where the conforming adjustment values are defined as being adjustment values which are the values of gain or offset applied to the input values of image data of an adjustment image by the input value adjustment unit when a color balance of the adjustment image displayed on the display becomes a specified color balance;
- a LUT extension unit setting unit which sets a LUT extension unit which is a table indicating a relationship between extension unit input values which are values greater than a maximum value that a LUT input value of the LUT can take and extension unit output values which are corrected values of the extension unit input values;
- and
- a LUT calculation unit which calculates the LUT correction data based on the conforming adjustment values acquired by the conforming adjustment value acquisition unit, the input values of the image data of the adjustment image, the LUT correction data, and the correction data of the LUT extension unit that has been set by the LUT extension unit setting unit;
- wherein
- if the LUT output value corresponding to the maximum value that the LUT input value of the LUT can take does not reach the maximum value that the LUT output value of the LUT can take, and also the conforming adjustment value acquired by the conforming adjustment value acquisition unit is greater than a reference adjustment value which is an initial value of the adjustment value applied by the input value adjustment unit to the input values of the image data of the adjustment image, then the LUT extension unit is set;
- and
- the conforming adjustment value acquisition unit, the LUT extension unit setting unit, and the LUT calculation unit setting unit are defined by a microcomputer.
8 more elements
A LUT adjustment method implemented by an image processor and a microcomputer, the method comprising:
- an adjustment image display step in which an adjustment image is displayed on a color display after applying a gain or offset to input values of image data of the adjustment image and, based on LUT correction data, correcting the input values of image data of the adjustment image to which the gain or offset has been applied;
- an adjustment value adjusting step in which the adjustment values that are the values of the gain or offset applied to the input values of the image data of the adjustment image are adjusted such that a color balance of the adjustment image displayed in the adjustment image display step becomes a specified color balance;
- a conforming adjustment value determination step in which the adjustment values that have been adjusted in the adjustment value adjusting step and that are the values of the gain or offset applied to the input values of the image data of the adjustment image when the color balance of the adjustment image becomes a specified color balance are determined as conforming adjustment values;
- a LUT extension unit setting step in which a LUT extension unit is set, with the LUT extension unit being a table indicating a relationship between extension unit input values which are values greater than a maximum value that a LUT input value of the LUT can take and extension unit output values which are corrected values of the extension unit input values;
- and
- a LUT calculation step in which the LUT correction data is calculated based on the conforming adjustment values determined in the conforming adjustment value determination step, the input values of the image data of the adjustment image, the LUT correction data, and the correction data of the LUT extension unit that has been set in the LUT extension unit setting step;
- wherein
- if the LUT output value corresponding to the maximum value that the LUT input value of the LUT can take does not reach the maximum value that the LUT output value of the LUT can take, and also the conforming adjustment value determined in the conforming adjustment value determination step is greater than a reference adjustment value which is an initial value of the adjustment value applied to the input values of the image data of the adjustment image, then the LUT extension unit is set in the LUT extension unit setting step.
5 more elements
An image display device comprising:
- an input value adjustment unit, defined by an image processor, which applies a gain or offset to input values of image data;
- a LUT which is a table of correction data used to correct the input values of image data having a gain or offset applied thereto by the input value adjustment unit and which is a table indicating a relationship between the LUT input values that are uncorrected values and LUT output values that are corrected values of the LUT input values;
- a display which displays images based on the input values of the image data that have been corrected based on the LUT correction data;
- a conforming adjustment value acquisition unit which acquires conforming adjustment values, where the conforming adjustment values are defined as being adjustment values which are values of the gain or offset applied to the input values of image data of an adjustment image by the input value adjustment unit when a color balance of the adjustment image displayed on the display becomes a specified color balance;
- a conforming adjustment value normalization unit which normalizes the conforming adjustment values acquired by the conforming adjustment value acquisition unit;
- an adjustment-use input value normalization unit which normalizes the input values of the image data of the adjustment image;
- a LUT extension unit setting unit which sets a LUT extension unit which is a table indicating a relationship between extension unit input values which are values greater than a maximum value that a LUT input value of the LUT can take and extension unit output values which are corrected values of the extension unit input values;
- and
- a LUT calculation unit which calculates the LUT correction data based on the conforming adjustment values normalized by the conforming adjustment value normalization unit, the input values of the image data of the adjustment image normalized by the adjustment-use input value normalization unit, the LUT correction data, and the correction data of the LUT extension unit that has been set by the LUT extension unit setting unit;
- wherein
- if the LUT output value corresponding to the maximum value that the LUT input value of the LUT can take does not reach the maximum value that the LUT output value of the LUT can take, and also the conforming adjustment value acquired by the conforming adjustment value acquisition unit is greater than a reference adjustment value which is an initial value of the adjustment value applied by the input value adjustment unit to the input values of the image data of the adjustment image, then the LUT extension unit is set;
- and
- the conforming adjustment value acquisition unit, the conforming adjustment value normalization unit, the adjustment-use input value normalization unit, the LUT extension unit setting unit, and the LUT calculation unit are defined by a microcomputer.
10 more elements
A LUT adjustment method implemented by an image processor and a microcomputer, the method comprising:
- an adjustment image display step in which an adjustment image is displayed on a color display after applying a gain or offset to input values of image data of the adjustment image and, based on LUT correction data, correcting the input values of image data of the adjustment image to which the gain or offset has been applied;
- an adjustment value adjusting step in which the adjustment values that are values of the gain or offset applied to the input values of the image data of the adjustment image are adjusted such that a color balance of the adjustment image displayed in the adjustment image display step becomes a specified color balance;
- a conforming adjustment value determination step in which the adjustment values that have been adjusted in the adjustment value adjusting step and that are the values of the gain or offset applied to the input values of the image data of the adjustment image when the color balance of the adjustment image becomes a specified color balance are determined as the conforming adjustment values;
- a conforming adjustment value normalization step in which the conforming adjustment values determined in the conforming adjustment value determination step are normalized;
- an adjustment-use input value normalization step in which the input values of the image data of the adjustment image are normalized;
- a LUT extension unit setting step in which a LUT extension unit is set, with the LUT extension unit being a table indicating a relationship between extension unit input values which are values greater than a maximum value that a LUT input value of the LUT can take and extension unit output values which are corrected values of the extension unit input values;
- and
- a LUT calculation step in which the LUT correction data is calculated based on the conforming adjustment values normalized in the conforming adjustment value normalization step, the input values of the image data of the adjustment image normalized in the adjustment-use input value normalization step, the LUT correction data, and the correction data of the LUT extension unit that has been set in the LUT extension unit setting step;
- wherein
- if the LUT output value corresponding to the maximum value that the LUT input value of the LUT can take does not reach the maximum value that the LUT output value of the LUT can take, and also the conforming adjustment value determined in the conforming adjustment value determination step is greater than a reference adjustment value which is an initial value of the adjustment value applied to the input values of the image data of the adjustment image, then the LUT extension unit is set in the LUT extension unit setting step.
7 more elements
A display device comprising:
- a lookup table which transforms an intensity level of an input signal;
- and
- a display which displays images based on the lookup table;
- wherein
- the lookup table includes a first range that is equal to or lower than a first intensity level, a second range that is higher than the first intensity level and lower than a second intensity level, a third range that is equal to or higher than the second intensity level, and first correction data that is set in the lookup table and calculated based on:
- a first gain value and the lookup table over the first range;
- the first gain value, a second gain value, and the lookup table over the second range;
- and
- the second gain value and the lookup table over the third range.
6 more elements
Dependencies are inferred from the claim text.