Device and method of processing image for power consumption reduction

• US 20100091029A1
• Filed: 03/20/2009
• Published: 04/15/2010
• Est. Priority Date: 10/10/2008
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Lee, Seung Sin, Park, Du-Sik, Han, Young Ran
• Granted Patent: US 8,194,092 B2
• Time in Patent Office: Days
• US Class Current: 345/589
• CPC Class Codes: G06T 5/008 Local, e.g. shadow enhancement
• CPC Class Codes: G06T 5/40 using histogram techniques
• CPC Class Codes: G06T 5/94 based on local image properties, e.g. for local contrast enhancement

Abstract

An image processing method for reducing a power consumption. The image processing method may reduce the power consumption by classifying an input content into a conversion target region and a preservation target region and by converting a luminance of pixels included in the conversion target region. Also, the image processing method may effectively perform a luminance conversion for pixels by separating the input content into the conversion target region and the preservation target region based on a luminance of the pixels of the input content. The image processing method may convert the luminance of the pixels of the conversion target region to maintain a contrast between text pixels and background pixels.

Claims

1. An image processing method for reducing a power consumption, the method comprising:

identifying a conversion target region and a preservation target region in an input content based on a luminance of pixels of the input content; and

converting a luminance of text pixels and background pixels of the conversion target region according to a predetermined standard,

wherein the converted luminance of the text pixels is higher than the converted luminance of the background pixels.

2. The method of claim 1, wherein the converting converts the luminance of the text pixels and the background pixels of the conversion target region based on a contrast between the text pixels and the background pixels.

3. The method of claim 1, wherein the converting converts the luminance of the text pixels and the background pixels of the conversion target region, so that the luminance of the text pixels may be adjusted according to a saturation of the text pixels.

4. The method of claim 3, wherein the converted luminance of the text pixels increases as the saturation of the text pixels increases.

5. The method of claim 1, wherein:

the identifying comprises comparing the luminance of the pixels of the input content with a predetermined threshold to quantize the luminance of the pixels of the input content to either a first luminance or a second luminance higher than the first luminance, and

the conversion target region and the preservation target region are identified according to the quantized luminance of the pixels of the input content.

6. The method of claim 5, wherein:

the pixels of the conversion target region have the second luminance, and

the converting comprises converting the luminance of the pixels of the conversion target region having the second luminance according to the standard.

7. The method of claim 1, further comprising:

creating an output image including the conversion target region and the preservation target region with the converted luminance.

8. The method of claim 5, wherein the identifying comprises:

filtering the quantized luminance of the pixels of the input content using a plurality of pre-designed filters, so that pixels included in the preservation target region may have the first luminance.

9. The method of claim 8, wherein the filtering comprises:

filtering pixels of which the luminance is quantized to have the second luminance, among the pixels of the input content, so that the pixels included in the preservation target region may have the first luminance.

10. The method of claim 8, wherein the identifying comprises:

erasing a text included in the conversion target region.

11. The method of claim 1, wherein pixels of the preservation target region maintain their original color.

12. The method of claim 1, wherein the image processing method for reducing the power consumption is applicable for an active matrix organic light emitting diode (AM OLED).

13. A computer-readable recording medium storing a program for implementing the method of claim 1.

14. An image processing device for reducing a power consumption, the device comprising:

a region identification unit to identify a conversion target region and a preservation target region in an input content based on a luminance of pixels of the input content; and

a luminance converter to convert a luminance of text pixels and background pixels of the conversion target region according to a predetermined standard, and

wherein the converted luminance of the text pixels is higher than the converted luminance of the background pixels.

15. The device of claim 14, wherein the luminance converter converts the luminance of the text pixels and the background pixels of the conversion target region based on a contrast between the text pixels and the background pixels.

16. The device of claim 14, wherein the luminance converter converts the luminance of the text pixels and the background pixels of the conversion target region, so that the luminance of the text pixels may be adjusted according to a saturation of the text pixels.

17. The device of claim 14, wherein the region identification unit comprises:

a quantization unit to compare the luminance of the pixels of the input content with a predetermined threshold to thereby quantize the luminance of the pixels of the input content to either a first luminance or a second luminance higher than the first luminance;

a filtering unit to filter the quantized luminance of the pixels of the input content using a plurality of pre-designed filters, so that pixels included in the preservation target region may have the first luminance; and

a text erase unit to erase a text included in the conversion target region.