Stereoscopic depth mapping
View Patent ↗Provided is a method and apparatus for linear depth mapping. Linear depth mapping includes using algorithms to correct the distorted depth mapping of stereoscopic capture and display systems.
1. A method for positioning cameras for capturing a stereoscopic image of a scene comprising a left image and a right image, the method comprising a processor performing the steps of:
determining a camera separation distance, wherein the camera separation distance is based on a minimum separation between a left and right eye image for a nearest object in a stereoscopic image and on a maximum separation between a left and right image for a most distant object in the stereoscopic image;
determining whether a scaled-depth mapping condition is met; and
applying the scaled-depth mapping, whereby throughout the scene, a perceived depth of the scene is set directly proportional to an actual depth of the scene.
2. A method for positioning first and second cameras for capturing a stereoscopic image of a scene comprising a left image and a right image, the first and second cameras being spaced apart by a camera separation distance, the method comprising a processor performing the steps of:
determining a camera separation distance, wherein the camera separation distance is based on a minimum separation between a left and right eye image for a nearest object in a stereoscopic image and on a maximum separation between a left and right image for a most distant object in the stereoscopic image;
determining whether a scaled-depth mapping condition is met;
if the scaled-depth mapping condition is met, applying the scaled-depth mapping, whereby throughout the scene, a perceived depth of the scene is set directly proportional to an actual depth of the scene; and
if the scaled-depth mapping condition is not met, setting the camera separation distance as a function of depth of an object in the scene.
3. The method of claim 2 , wherein setting the camera separation distance as a function of depth comprises determining the camera separation using a linear mapping equation.
4. The method of claim 2 , further comprising determining the camera separation distance if the scaled-depth mapping condition is met.
5. A method for providing a stereoscopic image of a scene comprising a left image and a right image, the left image having left image pixels and the right image having corresponding right image pixels, the method comprising a processor performing the steps of:
determining a camera separation distance between a first and second camera position based at least in part on a depth of an object in a scene, wherein the camera separation distance is based on a minimum separation between a left and right eye image for a nearest object in a stereoscopic image and on a maximum separation between a left and right image for a most distant object in the stereoscopic image;
adjusting an actual disparity of pixels in a captured image pair to provide a desired disparity for the left image pixels and the right image pixels.
6. The method of claim 5 , wherein adjusting the actual disparity to provide the desired disparity comprises correcting for non-linear mapping.
7. The method of claim 5 , wherein the actual disparity comprises an offset between a left and right eye image of the captured image pair.
8. The method of claim 5 , wherein the desired disparity comprises an offset between the left image pixels and the right image pixels of the stereoscopic image of the scene.
9. The method of claim 5 , further comprising back-filling the stereoscopic image of the scene.
10. A method for positioning first and second cameras for capturing one or more stereoscopic image frames, each stereoscopic image frame comprising a left image and a right image, and the first and second cameras being spaced apart by a camera separation distance, the method comprising a processor performing the steps of:
determining a camera separation distance based on a minimum separation between a left and right eye image for a nearest object in a stereoscopic image and on a maximum separation between a left and right image for a most distant object in the stereoscopic image
determining a current frame position and direction;
calculating a camera spacing profile A(Z) for the current frame;
calculating a fixed disparity D based on a desired disparity budget for the current frame;
capturing left and right images for the current frame using varying camera positions based on the camera spacing profile;
cropping and shifting the left and right images for the current flame based on the fixed disparity D.
11. The method of claim 10 , further comprising buffering the left and right images for the current frame.
12. The method of claim 11 , further comprising repeating the determining, calculating, capturing, cropping and shifting, and buffering for a plurality of consecutive stereoscopic image frames.