Image processing device and image processing method using the same

1. An image processing device comprising:

a display panel configured to display a high dynamic range (HDR) image received from a content provider;

a metadata parser configured to parse luminance information of the image; and

a tone mapping unit configured to:

obtain a peak luminance value of the HDR image from the parsed luminance information of the HDR image;

determine whether the peak luminance value is within a predetermined range;

if the peak luminance value is within the predetermined range, adjust a luminance of the HDR image within an available output luminance range of the display panel using a static tone curve generated based on a maximum available output luminance value of the display panel; and

if the peak luminance value is outside of the predetermined range, adjust the luminance of the HDR image within the available output luminance range of the display panel using an adaptive tone curve that is generated by modifying the static tone curve based on the peak luminance value of the HDR image.

2. The device of claim 1 , wherein the tone mapping unit is further configured to adjust luminance of an image signal region of the HDR image having a luminance value equal to or lower than the peak luminance value.

3. The device of claim 2 , wherein the tone mapping unit is further configured to increase gradually the luminance of the image signal region from a minimum available output luminance value to the maximum available output luminance value of the display panel.

4. The device of claim 1 , wherein the tone mapping unit is further configured to:

acquire peak luminance values of multiple scenes forming the HDR image;

obtain an average peak luminance value of the acquired peak luminance values; and

adjust the luminance of the HDR image within the available output luminance range of the display panel based on the acquired average peak luminance value,

wherein each of the multiple scenes includes a predetermined number of image frames.

5. The device of claim 1 , wherein the tone mapping unit is further configured to:

acquire peak luminance values of multiple image frames forming the HDR image;

obtain an average peak luminance value of the acquired peak luminance values; and

adjust the luminance of the HDR image within the available output luminance range of the display panel based on the acquired average peak luminance value.

6. The device of claim 1 , wherein the tone mapping unit is further configured to:

receive metadata including information about the HDR image; and

acquire the peak luminance value of the HDR image from the metadata.

7. The device of claim 1 , wherein the tone mapping unit is further configured to perform color mapping to transfer a color of the HDR image to be within a color rendering range of the display panel.

8. An image processing method using an image processing device including a display panel, the method comprising:

receiving a high dynamic range (HDR) image;

parsing luminance information of a high dynamic range (HDR) image;

receiving a peak luminance value of the HDR image;

determining whether the peak luminance value is within a predetermined range;

if the peak luminance value is within the predetermined range, adjusting the luminance of the HDR image within the available output luminance range of the display panel using a static tone curve generated based on a maximum available output luminance value of the display panel; and

if the peak luminance value is outside of the predetermined range, adjusting the luminance of the HDR image within the available output luminance range of the display panel using an adaptive tone curve that is generated by modifying the static tone curve based on the peak luminance value of the HDR image.

9. The method of claim 8 , wherein the adjusting the luminance of the HDR image comprises adjusting the luminance of an image signal region of the HDR image having a luminance value equal to or lower than the peak luminance value.

10. The method of claim 9 , wherein the adjusting the luminance of the HDR image comprises increasing gradually the luminance of the image signal region from a minimum available output luminance value to a maximum available output luminance value of the display panel.

11. The method of claim 8 , wherein the acquiring the peak luminance value of the HDR image comprises:

acquiring peak luminance values of multiple scenes forming the HDR image; and

obtaining an average peak luminance value of the acquired peak luminance values,

wherein the adjusting the luminance of the HDR image comprises adjusting the luminance of the HDR image within the available output luminance range of the display panel based on the acquired average peak luminance value,

wherein each of the multiple scenes includes a predetermined number of image frames.

12. The method of claim 8 , wherein the acquiring the peak luminance value of the HDR image comprises:

acquiring peak luminance values of multiple image frames forming the HDR image; and

obtaining an average peak luminance value of the acquired peak luminance values,

wherein the adjustment of the luminance of the HDR image comprises adjusting the luminance of the HDR image within the available output luminance range of the display panel based on the acquired average peak luminance value.

13. The method of claim 8 , further comprising:

receiving metadata including information about the HDR image, wherein the acquiring the peak luminance value of the HDR image comprises acquiring the peak luminance value of the HDR image from the metadata.

14. The method of claim 8 , further comprising performing color mapping to transfer a color of the HDR image to be within a color rendering range of the display panel.