APPARATUS AND METHOD OF DISPLAYING OVERLAID IMAGE

• US 20080165190A1
• Filed: 09/07/2007
• Published: 07/10/2008
• Est. Priority Date: 01/09/2007
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: MIN, SUNG-HWAN, Cho, Sung-hee
• Application Number:
  US11/851,717
• Publication Number:
  US 20080165190A1
• Time in Patent Office: Days
• US Class Current: 345/421
• CPC Class Codes: G06T 15/503 Blending, e.g. for anti-aliasing

Abstract

An apparatus to display an overlaid image includes an alpha-value-checking unit to check a 3D object having an alpha value among 3D objects of an overlay plane, a blending unit to blend the 3D object and the previously painted overlay plane based on a plurality of blending rules if the 3D object has a predetermined alpha value as a result of the check by the alpha-value-checking unit, and a rendering unit to render the blended 3D object and the previously painted overlay plane.

Claims

1. An apparatus to display an overlaid image, the apparatus comprising:

an alpha-value-checking unit to check a 3D object having an alpha value among 3D objects of a previously painted overlay plane;

a blending unit to blend the 3D object and the previously painted overlay plane based on a plurality of blending rules, if the 3D object has a predetermined alpha value as a result of the check by the alpha-value-checking unit; and

a rendering unit to render the blended 3D object and the previously painted overlay plane.

2. The apparatus of claim 1, wherein a first of the blending rules is indicated by r₁=s*sA+d*(1−

sA),

where, s (source) refers to the 3D, sA (source α

) refers to an alpha (α

) value of the 3D object, d (destination) refers to a 3D object that is already painted on the previously painted overlay plane, and r₁ (result) refers to a first blended result value, and

a second of the blending rules is indicated by;

r₂=s*dA+d*(1),

where s (source) refers to the 3D object, dA (destination α

) refers to the alpha (α

) value of the 3D object that is already painted on the previously painted overlay plane, and d (destination) refers to the 3D object that is already painted on the previously painted overlay plane.

3. The apparatus of claim 2, wherein blending is performed by the blending unit according to the second blending rule where a color value is 0 and the destination alpha value is 0.5.

4. The apparatus of claim 1, wherein an open GL ES (graphics library embedded system) 1.0 specification is used by the apparatus.

5. A method of displaying an overlaid image, the method comprising:

checking a 3D object having an alpha value among 3D objects of a previously painted overlay plane;

blending the 3D object having the alpha value and the previously painted overlay plane based on a plurality of blending rules if the 3D object has a predetermined alpha value as a result of the checking; and

rendering the overlay plane of the 3D object blended through the plurality of blending rules.

6. The method of claim 5, wherein a first of the blending rules is indicated by r₁=s*sA+d*(1−

sA),

where, s (source) refers to the 3D, sA (source α

) refers to an alpha (α

) value of the 3D object, d (destination) refers to a 3D object that is already painted on the previously painted overlay plane, and r₁ (result) refers to a first blended result value, and

a second of the blending rules is indicated by r₂=s*dA+d*(1),

where s (source) refers to the 3D object, dA (destination α

) refers to the alpha (α

) value of the 3D object that is already painted on the previously painted overlay plane, and d (destination) refers to the 3D object that is already painted on the previously painted overlay plane.

7. The method of claim 6, wherein blending of the 3D object is performed according to the second blending rule where a color value is 0 and the destination alpha value is 0.5.

8. The method of claim 5, wherein the blending of the 3D object is based on an Open GL ES (graphics library embedded system) 1.0 specification.

9. A method of displaying an overlaid image, comprising:

obtaining an alpha value of an object to be blended with an overlay plane;

a first blending process to blend the object with the overlay plane using a first blending rule and obtaining a first result having a range of alpha values that decreased;

a second blending process to blend a polygon with the first result using a second blending rule to obtain a second result to increase the range of the alpha values; and

rendering the second result.

10. The method of claim 9, wherein the first blending process is performed according to the first blending rule of r₁=s*sA+d*(1−

sA),

where, s (source) refers to the object, sA (source α

) refers to an alpha value of the object, d (destination) refers to the overlay plane, and r₁ (result) refers to a first blended result.

11. The method of claim 10, wherein the second blending process is performed according to the second blending rule of r₂=s*dA+d*(1),

where, the s (source) refers to the object, dA (destination α

) refers to an alpha value of the overlay plane after the first blending, d (destination) refers to the overlay plane after the first blending, and r₂ (result) refers to a second blended result.

12. The method of claim 9, wherein the range of alpha values that decreased are about 0 to 0.25.

13. The method of claim 9, wherein the polygon has a color value of 0 and an alpha value of 0.5.

14. The method of claim 9, wherein an alpha value that exceeds 1.0 is set to be 1.0.

15. An apparatus to display an overlaid image, comprising:

an alpha-value-checker to obtain an alpha value of an object to be blended with an overlay plane;

a blender to perform a first blending process to blend the object with the overlay plane using a first blending rule and obtaining a first result having a range of alpha values that decreased, and a second blending process to blend a polygon with the first result using a second blending rule to obtain a second result to increase the range of the alpha values; and

a renderer to rendering the second result.

16. The apparatus of claim 15, wherein the first blending process is performed according to the first blending rule of r₁=s*sA+d*(1−

sA),

where, s (source) refers to the object, sA (source α

) refers to an alpha value of the object, d (destination) refers to the overlay plane, and r₁ (result) refers to a first blended result.

17. The apparatus of claim 15, wherein the second blending process is performed according to the second blending rule of r₂=s*dA+d*(1),

where, the s (source) refers to the object, dA (destination α

) refers to an alpha value of the overlay plane after the first blending, d (destination) refers to the overlay plane after the first blending, and r₂ (result) refers to a second blended result.

18. The apparatus of claim 15, wherein the range of alpha values that decreased are about 0 to 0.25.

19. The apparatus of claim 15, wherein the polygon has a color value of 0 and an alpha value of 0.5.

20. The method of claim 15, wherein an alpha value that exceeds 1.0 is set to be 1.0.