METHOD FOR CORRECTING GRADATION AND DEVICE OR METHOD FOR DETERMINING THRESHOLDS FOR EPSILON-FILTER Russian patent published in 2017 - IPC G09G5/02 

FIELD: physics.

SUBSTANCE: each value of the discrimination threshold corresponding to each obtained luminance value, which is intended to be assigned for each panel gradation unit, is received by the gradation correcting method. The pixel value corresponding to each discrimination threshold value is obtained for each panel gradation unit. The threshold epsilon-filter value is obtained by the inverse gamma-correction of the relationship between the distinct values of the discrimination threshold corresponding to the panel gradation units and the maximum panel output value. Based on the linear approximation function, they are obtained by the method of the least squares. The threshold epsilon-filter value is defined as the increasing function of the pixel value on the basis of the permitted number of steps of the discrimination threshold values and is changed according to the central pixel value.

EFFECT: reduction of the image distortion caused by the halo effect.

12 cl, 9 dwg