17-01-2013, 12:57 PM
LIGHT-FIELD(PLENOPTIC) CAMERA ABSTRACT
[attachment=47322]
ABSTRACT
A light-field camera, also called a Plenoptic camera, is a camera that uses a microlens array to capture 4D light field information about a scene. Such light field information can be used to improve the solution of computer graphics and computer vision-related problems.
To achieve Stereo matching, an array of microlenses is placed at the focal plane of the camera main lens. The image sensor is positioned slightly behind the microlenses. Using such images the displacement of image parts that are not in focus can be analyzed and depth information can be extracted. Potentially, this camera system can be used to refocus an image virtually on a computer after the picture has been taken, as explained by Ren Ng. The drawback of such a system is the low resolution that the final images have. As one microlens samples the light directions at one spatial point an increase in the number of image pixels can only be done by increasing the number of microlenses by the same amount. Light field photography (also known as plenoptic photography) captures all the available light in a scene going in every direction. It works by breaking up the main image with an array of microlenses over an image sensor. The camera software then uses this data to determine the directions of incoming light rays. A Plenoptic camera has features such as- Refocusing, speed, light sensitivity(photography in low-light environments without a flash), 3D images(since a plenoptic camera records depth information).
[attachment=47322]
ABSTRACT
A light-field camera, also called a Plenoptic camera, is a camera that uses a microlens array to capture 4D light field information about a scene. Such light field information can be used to improve the solution of computer graphics and computer vision-related problems.
To achieve Stereo matching, an array of microlenses is placed at the focal plane of the camera main lens. The image sensor is positioned slightly behind the microlenses. Using such images the displacement of image parts that are not in focus can be analyzed and depth information can be extracted. Potentially, this camera system can be used to refocus an image virtually on a computer after the picture has been taken, as explained by Ren Ng. The drawback of such a system is the low resolution that the final images have. As one microlens samples the light directions at one spatial point an increase in the number of image pixels can only be done by increasing the number of microlenses by the same amount. Light field photography (also known as plenoptic photography) captures all the available light in a scene going in every direction. It works by breaking up the main image with an array of microlenses over an image sensor. The camera software then uses this data to determine the directions of incoming light rays. A Plenoptic camera has features such as- Refocusing, speed, light sensitivity(photography in low-light environments without a flash), 3D images(since a plenoptic camera records depth information).