Method of creating a virtual window
View Patent ↗The systems and methods described herein include, among other things, a technique for calibrating the outputs of multiple sensors, such as CCD devices, that have overlapping fields of view and mapping the pixels of those outputs to the pixels of a display screen by means of a lookup table so that a user can see a selected field of view within the larger fields of view that are seen by the sensors.
1. A method for manufacturing a panoramic image sensor, comprising the steps of:
providing a sensor body,
disposing on the surface of the sensor body a plurality of imaging sensors, each having a field of view, wherein at least two imaging sensors have at least partially overlapping fields of view,
presenting a grid pattern to the plurality of imaging sensors and allowing the at least two sensors to each capture an image of the grid pattern appearing in its respective field of view,
processing the captured images to identify an overlapping portion of the grid pattern that corresponds to an overlapping region within the overlapping fields of view of the at least two sensors, and
calibrating, using the overlapping portion of the grid pattern, the plurality of image sensors to generate a panoramic image.
2. A method according to claim 1 , wherein providing a sensor body includes providing a sensor body having a substantially convex exterior surface.
3. A method according to claim 1 , wherein providing a sensor body includes providing a sensor body having a substantially hemi-decahedron exterior surface.
4. A method according to claim 1 , wherein disposing a plurality of imaging sensors on the sensor body includes arranging the sensors across the surface to capture a hemispherical region within the field of view of the plural sensors.
5. A method according to claim 1 , wherein presenting a grid pattern includes tracing a grid pattern with a light source across a surface.
6. A method according to claim 5 , wherein calibrating includes generating a lookup table with the information of which pixel of which sensor responds to the light source at a defined point on the grid.
7. A method according to claim 6 , wherein calibrating includes selecting between two or more sensors that each respond to the light source at a defined point on the grid.
8. A method according to claim 1 , wherein presenting a grid pattern includes forming an image of a grid pattern on an interior surface of a hemispherical surface.
9. A method according to claim 1 , wherein presenting a grid pattern includes displaying an image of a grid to the sensors.
10. A method according to claim 1 , wherein calibrating includes generating a lookup table having information of which sensor pixel of which sensor “sees” a portion of the grid pattern at a time.
11. Apparatus for calibrating a panoramic image sensor, comprising:
a sensor body,
a plurality of imaging sensors, each having a plurality of pixels and being disposed on the surface of the sensor body and having respective fields of view, wherein at least two of the sensors have at least partially overlapping fields of view,
a grid pattern disposed within-the fields of view of the at least two sensors for allowing the at least two sensors to each capture an image of the grid pattern appearing in its respective field of view, and
a calibration mechanism for processing the captured images to identify an overlapping portion of the grid pattern that appears in an overlapping region within the overlapping fields of view of the at least two sensors and for generating a look up table correlating pixels in a panoramic image with pixels in said plurality of sensors, based at least in part on the overlapping portion of the grid pattern.