LIGHT-LEAKAGE-CORRECTION TECHNIQUE FOR VIDEO PLAYBACK
First Claim
1. A system, comprising one or more integrated circuits, wherein the one or more integrated circuits are configured to:
- transform a video image from an initial brightness domain to a linear brightness domain, the linear brightness domain characterized by a range of brightness values corresponding to substantially equidistant adjacent radiant-power values in a displayed video image, wherein the transformation includes an offset at minimum brightness that is associated with light leakage in a display that is configured to display video images;
determine an intensity setting of a light source based on at least a portion of the transformed video image, the light source configured to illuminate the display; and
modify the transformed video image so that a product of the intensity setting and a transmittance associated with the modified video image approximately equals a product of a previous intensity setting and a transmittance associated with the video image.
1 Assignment
0 Petitions
Accused Products
Abstract
Embodiments of a system that includes one or more integrated circuits are described. During operation, the system compensates for gamma correction in a video image to produce a linear relationship between brightness values and an associated brightness of the video image when displayed, where the compensation includes an offset at minimum brightness that is associated with light leakage in a display that is configured to display video images. Then, the system calculates an intensity setting of a light source based on at least a portion of the compensated video image, the light source configured to illuminate the display. Next, the system adjusts the compensated video image so that a product of the intensity setting and a transmittance associated with the adjusted video image approximately equals a product of a previous intensity setting and a transmittance associated with the video image.
-
Citations
25 Claims
-
1. A system, comprising one or more integrated circuits, wherein the one or more integrated circuits are configured to:
-
transform a video image from an initial brightness domain to a linear brightness domain, the linear brightness domain characterized by a range of brightness values corresponding to substantially equidistant adjacent radiant-power values in a displayed video image, wherein the transformation includes an offset at minimum brightness that is associated with light leakage in a display that is configured to display video images; determine an intensity setting of a light source based on at least a portion of the transformed video image, the light source configured to illuminate the display; and modify the transformed video image so that a product of the intensity setting and a transmittance associated with the modified video image approximately equals a product of a previous intensity setting and a transmittance associated with the video image. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
-
-
19. A system, comprising:
-
an input node configured to receive video signals associated with a video image; a transform circuit electrically coupled to the input node, the transform circuit configured to transform the video image from an initial brightness domain to a linear brightness domain that is characterized by a range of brightness values corresponding to substantially equidistant adjacent radiant-power values in a displayed video image, wherein the transformation includes an offset at minimum brightness that is associated with light leakage in a display that is configured to display video images; a computation circuit electrically coupled to the transform circuit, the computation circuit configured to determine an intensity setting of a light source, which is configured to illuminate the display, based on at least a portion of the transformed video image and configured to modify the transformed video image so that a product of the intensity setting and a transmittance associated with the modified video image approximately equals a product of a previous intensity setting and a transmittance associated with the video image; and an output node electrically coupled to the computation circuit, the output node configured to output signals corresponding to the modified video signals.
-
-
20. A method for adjusting a video image, comprising:
-
compensating for gamma correction in a video image to produce a linear relationship between brightness values and an associated brightness of the video image when displayed, wherein the compensation includes an offset at minimum brightness that is associated with light leakage in a display that is configured to display video images; calculating an intensity setting of a light source based on at least a portion of the compensated video image, the light source configured to illuminate the display; and adjusting the compensated video image so that a product of the intensity setting and a transmittance associated with the adjusted video image approximately equals a product of a previous intensity setting and a transmittance associated with the video image.
-
-
21. A computer-program product for use in conjunction with a computer system, the computer-program product comprising a computer-readable storage medium and a computer-program mechanism embedded therein for adjusting a video image, the computer-program mechanism comprising:
-
instructions for compensating for gamma correction in a video image to produce a linear relationship between brightness values and an associated brightness of the video image when displayed, wherein the compensation includes an offset at minimum brightness that is associated with light leakage in a display that is configured to display video images; instructions for calculating an intensity setting of a light source based on at least a portion of the compensated video image, the light source configured to illuminate the display; and instructions for adjusting the compensated video image so that a product of the intensity setting and a transmittance associated with the adjusted video image approximately equals a product of a previous intensity setting and a transmittance associated with the video image.
-
-
22. A computer system to adjust a video image, comprising:
-
a processor; memory; a program module, wherein the program module is stored in the memory and configurable to be executed by the processor, the program module including; instructions for compensating for gamma correction in a video image to produce a linear relationship between brightness values and an associated brightness of the video image when displayed wherein the compensation includes an offset at minimum brightness that is associated with light leakage in a display that is configured to display video images; instructions for calculating an intensity setting of a light source based on at least a portion of the compensated video image, the light source configured to illuminate the display; and instructions for adjusting the compensated video image so that a product of the intensity setting and a transmittance associated with the adjusted video image approximately equals a product of a previous intensity setting and a transmittance associated with the video image.
-
-
23. A computer system configured to adjust a video image, comprising:
-
a processor; a memory; an instruction fetch unit within the processor configured to fetch; instructions for compensating for gamma correction in a video image to produce a linear relationship between brightness values and an associated brightness of the video image when displayed wherein the compensation includes an offset at minimum brightness that is associated with light leakage in a display that is configured to display video images; instructions for calculating an intensity setting of a light source based on at least a portion of the compensated video image, the light source configured to illuminate the display; and instructions for adjusting the compensated video image so that a product of the intensity setting and a transmittance associated with the adjusted video image approximately equals a product of a previous intensity setting and a transmittance associated with the video image.
-
-
24. An integrated circuit, comprising one or more sub-circuits, wherein the one or more sub-circuits are configured to:
-
transform a video image from an initial brightness domain to a linear brightness domain, the linear brightness domain characterized by a range of brightness values corresponding to substantially equidistant adjacent radiant-power values in a displayed video image wherein the transformation includes an offset at minimum brightness that is associated with light leakage in a display that is configured to display video images; determine an intensity setting of a light source based on at least a portion of the transformed video image, the light source configured to illuminate the display; and modify the transformed video image so that a product of the intensity setting and a transmittance associated with the modified video image approximately equals a product of a previous intensity setting and a transmittance associated with the video image.
-
-
25. A portable device, comprising:
-
a display; a light source configured to output light; an attenuation mechanism configured to modulate the output light incident on the display, the display configured to display a video image; and one or more integrated circuits, wherein the one or more integrated circuits are configured to; transform the video image from an initial brightness domain to a linear brightness domain, the linear brightness domain characterized by a range of brightness values corresponding to substantially equidistant adjacent radiant-power values in a displayed video image wherein the transformation includes an offset at minimum brightness that is associated with light leakage in a display that is configured to display video images; determine an intensity setting of a light source based on at least a portion of the transformed video image, the light source configured to illuminate the display; and modify the transformed video image so that a product of the intensity setting and a transmittance associated with the modified video image approximately equals a product of a previous intensity setting and a transmittance associated with the video image.
-
Specification