Image data processing device and method of processing image data based on a representative value of an image

Patent metadata

Field	Value
Publication number	US-11488563-B2
Application number	US-202117190935-A
Country	US
Kind code	B2
Filing date	Mar 3, 2021
Priority date	Mar 6, 2020
Publication date	Nov 1, 2022
Grant date	Nov 1, 2022

Abstract

The present disclosure relates to a device and a method for processing image data for driving a display panel. More particularly, it relates to a device and a method to vary the brightness of each pixel according to a representative brightness value of an image.

First claim

What is claimed is:

1. A method of processing image data by a processing device, the method comprising:
calculating a representative brightness value for input pixel brightness values included input image data;
calculating N (N is a natural value, which is 2 or higher) X-axis point values using N set values;
generating a first reference curve using N first Y-axis point values and the X-axis point values and generating a second reference curve using N second Y-axis point values and the X-axis point values;
generating a brightness adjustment curve using the first reference curve, the second reference curve, and the representative brightness value; and
converting the input pixel brightness values into output pixel brightness values using the brightness adjustment curve,
wherein the set values comprise indexes of involutions of 2,
wherein calculating the X-axis point values comprises calculating an Nth involution value, which is a value of the involution of 2 having an Nth set value as an index, by an operation of shift by the Nth set value, which is a last set value, and calculating an Nth X-axis point value, which is a maximum X-axis point value, by subtracting the Nth involution value from a highest brightness value of a pixel.

2. The method of processing image data of claim 1 , further comprising a step of transmitting output image data including the output pixel brightness values to a panel driving device.

3. The method of processing image data of claim 1 , wherein the input pixel brightness values, the X-axis point values, the first Y-axis point values, the second Y-axis point values, and the output pixel brightness values are greyscale values.

4. The method of processing image data of claim 1 , wherein X-axis coordinate values of the brightness adjustment curve comprise the input pixel brightness values and Y-axis coordinate values of the brightness adjustment curve comprise the output pixel brightness values.

5. The method of processing image data of claim 1 , wherein generating the first reference curve and the second reference curve comprises: generating a first reference curve by matching the X-axis point values with the first Y-axis point values and calculating values between the X-axis point values by a data interpolation; and generating a second reference curve by matching the X-axis point values with the second Y-axis point values and calculating values between the X-axis point values by the data interpolation.

6. The method of processing image data of claim 1 , wherein the representative brightness value is less than or equal to a first representative brightness value identified in the first reference curve and equal to or greater than a second representative brightness value identified in the second reference curve.

7. The method of processing image data of claim 6 , wherein, the brightness adjustment curve is generated by a data interpolation using the first representative brightness value, the second representative brightness value, and the representative brightness value.

8. An image data processing device, comprising:
a representative brightness value calculating circuit to calculate a representative brightness value for input pixel brightness values included in input image data;
a curve generating circuit to generate a first reference curve by calculating N (N is a natural number, which is 2 or higher) X-axis point values using N set values and using N first Y-axis point values and the N X-axis point values, to generate a second reference curve using N second Y-axis point values and the N X-axis point values, and to generate a brightness adjustment curve using the first reference curve, the second reference curve, and the representative brightness value; and
an image data converting circuit to convert the input pixel brightness values into output pixel brightness values using the brightness adjustment curve,
wherein the curve generating circuit comprises:
a shift operation circuit to calculate values of involutions of 2 having the N set values as indexes by shift operations;
a subtraction circuit to calculate an Nth X-axis point value, which is a maximum X-axis point value, by subtracting an Nth involution value, which is a value of involution of 2 having an Nth set value (a last set value among the N set values) as an index, from a highest brightness value of a pixel and to calculate an N−1th X-axis point value by subtracting an N−1th involution value from the Nth X-axis point value; and
a data interpolation circuit to generate the first reference curve by matching the X-axis point values with the first Y-axis point values and calculating values between the X-axis point values and to generate the second reference curve by matching the X-axis point values with the second Y-axis point values and calculating values between the X-axis point values.

9. The image data processing device of claim 8 , further comprising an image data transmitting circuit to transmit output image data including the output pixel brightness values to a panel driving device.

10. The image data processing device of claim 8 , wherein the data interpolation circuit generates the brightness adjustment curve by a data interpolation using a first representative brightness value identified in the first reference curve, a second representative brightness value identified in the second reference curve, and the representative brightness value.

11. An image data processing device, comprising:
a representative brightness value calculating circuit to calculate a representative brightness value for input pixel brightness values included in input image data;
a curve generating circuit to generate a first reference curve by calculating N (N is a natural number, which is 2 or higher) X-axis point values using N set values and using N first Y-axis point values and the N X-axis point values, to generate a second reference curve using N second Y-axis point values and the N X-axis point values, and to generate a brightness adjustment curve using the first reference curve, the second reference curve, and the representative brightness value;
an image data converting circuit to convert the input pixel brightness values into output pixel brightness values using the brightness adjustment curve; and
a memory circuit to store the N set values, the N first Y-axis point values, and the N second Y-axis point values,
wherein the memory circuit further stores a lookup table including a plurality of representative brightness ranges, a plurality of weighted average brightness ranges, and a plurality of representative brightness levels corresponding to the plurality of representative brightness ranges and the plurality of weighted average brightness ranges,
wherein the input pixel brightness values comprise R greyscale values, which are greyscale values of red (R) sub-pixels, G greyscale values, which are greyscale values of green (G) sub-pixels, and B greyscale values, which are greyscale values of blue (B) sub-pixels and the representative brightness value calculating circuit calculates a weighted average brightness value by dividing a maximum value, among a first square sum value obtained by summing up square values of the R greyscale values, a second square sum value obtained by summing up square values of the G greyscale values, and a third square sum value obtained by summing up square values of the B greyscale values, by a maximum value among a first sum value obtained by summing up the R greyscale values, a second sum value obtained by summing up the G greyscale values, and a third sum value obtained by summing up the B greyscale values.

12. The image data processing device of claim 11 , wherein the curve

Assignees

• Silicon Works Co Ltd

Inventors

• JUN Young Jun
• Kim Bo Sung

Classifications

• G09G3/3413 Primary

  Details of control of colour illumination sources · CPC title

• G09G2320/0646

  Modulation of illumination source brightness and image signal correlated to each other · CPC title

• G09G3/20 Primary

  for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix {no fixed position being assigned to or needed to be assigned to the individual characters or partial characters} · CPC title

• G09G3/342

  using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines · CPC title

• G09G5/10 Primary

  Intensity circuits · CPC title