US 11,756,506 B2
Method and device for adjusting image quality, and readable storage medium
Daxue Xia, Guangdong (CN); Linjun He, Guangdong (CN); and Renli Xie, Guangdong (CN)
Assigned to Shenzhen TCL Digital Technology Ltd., Shenzhen (CN)
Appl. No. 17/618,518
Filed by Shenzhen TCL Digital Technology Ltd., Guangdong (CN)
PCT Filed May 15, 2020, PCT No. PCT/CN2020/090597
§ 371(c)(1), (2) Date Dec. 13, 2021,
PCT Pub. No. WO2020/259123, PCT Pub. Date Dec. 30, 2020.
Claims priority of application No. 20191056986.X (CN), filed on Jun. 27, 2019.
Prior Publication US 2022/0351701 A1, Nov. 3, 2022
Int. Cl. G09G 5/10 (2006.01)
CPC G09G 5/10 (2013.01) [G09G 2320/0686 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A method for adjusting image quality, applied in a display device system, comprising the following steps: selecting by the display device system a focus area of a target image; outputting a mapping relationship curve of an input luminance value and an output luminance value of the target image; calculating an input luminance value range of pixels in the focus area of the target image and proportionally adjusting upper and lower edge coefficients of the input luminance value range to obtain new upper and lower edge coefficients; and adjusting the mapping relationship curve according to the new upper and lower edge coefficients to adjust the focus area of the target image; wherein the outputting the mapping relationship curve of the input luminance value and the output luminance value of the target image comprises calculating using a linear Bézier curve to initially describe the mapping relationship curve of the input luminance value and the output luminance value; wherein the calculating the input luminance value range of the pixels in the focus area of the target image and proportionally adjusting the upper and lower edge coefficients of the input luminance value range to obtain the new upper and lower edge coefficients comprises: determining an upper limit value and a lower limit value of a Bézier curve of a ratio of the input luminance value and a maximum input luminance value of the pixels in the focus area of the target image; and proportionally scaling up or down interval upper and lower edge coefficients which are determined according to the upper limit value and the lower limit value of the Bézier curve to obtain the new upper and lower edge coefficients; wherein the linear Bézier curve is implemented by a fifth-order Bézier curve.