Wide field-of-view reflector and method of designing and making same
View Patent ↗A system and method for designing and using freeform reflectors to collect images of a wide angle field-of-view scene is provided. A freeform reflector may enable a wide angle field-of-view to be collected in an unwarpped and unwrapped manner such that computer processing may be eliminated. Furthermore, the use of a freeform reflector allows for larger areas of an image sensor chip to be used, thereby providing higher resolution images. Because freeform reflectors may be configured to map a scene onto the image sensor chip in a scalar and mathematically correct manner, output images may be directly displayed from the image sensor chip. Wide angle field-of-view imaging systems, such as surveillance, alarm, and projector system, may utilize freeform reflectors as provided herein.
1. A wide angle reflector device, comprising:
a freeform surface being reflective and having a shape defined by a mapping to reflect and map a light beam onto a sensor defined by pixels arranged in a predetermined shape, the freeform surface having a physical geometric configuration that maps the scene onto the sensor substantially free of distortion.
2. The reflector device according to claim 1 , wherein the reflective surface is an optical reflective surface.
3. The reflector device according to claim 2 , wherein the light beam defines an optical image having a field-of-view between approximately 30 degrees up to approximately 120 degrees.
4. The reflector device according to claim 1 , wherein the mapping causes the light beam to be redistributed when imaged on the sensor.
5. The reflector device according to claim 4 , wherein the redistribution of the light beam implements a mathematical function such that the light beam mapped onto the sensor is a corrected signal that does not need to be corrected digitally or otherwise.
6. The reflector device according to claim 1 , wherein the sensor is a CCD or CMOS image sensor chip.
7. The reflector device according to claim 6 , wherein reflector is configured to reflect a wide angle field-of-view image that covers substantially the entire image sensor chip.
8. The reflector device according to claim 1 , wherein the reflector has a surface that is curvilinear.
9. The reflector device according to claim 8 , wherein the surface includes linear and non-linear regions.
10. The reflector device according to claim 1 , wherein the light beam defines and optical image having a field-of-view ranging up to 360 degrees.
11. The reflector device according to claim 1 , wherein the mapping defines a predetermined distribution of the light beam onto the sensor.
12. The reflector device according to claim 1 , wherein the predetermined distribution of the light beam is scalar and mathematically correct.
13. The reflector device according to claim 1 , wherein the predetermined shape of pixel arrangement is a geometric shape.
14. The reflector device according to claim 1 , wherein the reflector has a surface profile defined by vector manipulation of an incident ray and a reflected ray to compute a normal vector.
15. The reflector device according to claim 1 , wherein the reflector has a surface freeform surface that is defined by a composite of normal vectors across reflection points.
16. The reflector device according to claim 1 , wherein the reflector has a surface defined by mapping source points along a panoramic cylinder onto the sensor.
17. The reflector device according to claim 1 , wherein the reflector has a surface that is a function of how a designer desires to map a scene on the sensor.
18. The reflector device according to claim 1 , wherein the sensor converts mapped images received into electronic signals that are displayed by an electronic display.
19. The reflector device according to claim 1 , wherein the reflector surface shape allows an image sensing system in which the reflector is included to operate without out any moving parts.
20. The reflector device according to claim 1 , wherein the sensor has a predetermined shape.