초록 ▼

A system and method obtain images of an object and generate a motion region image of the object. The motion region image is processed to obtain normal gradients of the portion of the object that has been moved. The normal gradient data is further processed to remove erroneous data points. The errone

A system and method obtain images of an object and generate a motion region image of the object. The motion region image is processed to obtain normal gradients of the portion of the object that has been moved. The normal gradient data is further processed to remove erroneous data points. The erroneous data can be removed by using either an eroding method or a threshold method. After the erroneous data is removed, the remaining gradient information is used to identify a motion of the object. This can be performed using a histogram recognition operation.

대표청구항 ▼

A system and method obtain images of an object and generate a motion region image of the object. The motion region image is processed to obtain normal gradients of the portion of the object that has been moved. The normal gradient data is further processed to remove erroneous data points. The errone

A system and method obtain images of an object and generate a motion region image of the object. The motion region image is processed to obtain normal gradients of the portion of the object that has been moved. The normal gradient data is further processed to remove erroneous data points. The erroneous data can be removed by using either an eroding method or a threshold method. After the erroneous data is removed, the remaining gradient information is used to identify a motion of the object. This can be performed using a histogram recognition operation. ; US-6392807, 20020500, Barbarossa et al., 359/161; US-6441959, 20020800, Yang et al., 359/495; US-20020012374, 20020100, Basting et al., 372/055 claim 1, wherein said tunable optical filter is positioned in a location selected from being: in front, between or after said at least one amplifier stage. 6. The optical device of claim 1, wherein: (a) said optical amplifier includes a first amplifier stage and a second amplifier stage; and (b) said tunable optical filter includes a fiber based Mach-Zehnder filter, said Mach-Zehnder filter including a first output coupled to said second amplifier stage and a second output coupled to a photodetector, wherein said photodetector is coupled to said at least one controller. 7. The optical amplifier of claim 2 wherein, (a) said optical amplifier is designed to accommodate average expected optical signal input power corresponding to a span loss of a preceding optical transmission fiber; (b) said amplifier including a plurality of amplifying stages; and (c) said at least one controller includes a first controller and a second controller, said first controller changing gain slope of the said amplifier without causing change in the output signal power of the amplifier, by adjusting a single parameter of the said optical filter; said second controller controlling said optical pumps and maintaining the optical pump power at the specified level; said first controller utilizing input from said additional photodetector and said second controller utilizing input from said plurality of the photodetectors; wherein said first and the second controllers do not exchange information when the input signal power is higher or equal to the average expected input signal power, while gain slope is being changed; and when input power is lower than the average expected input signal power, said first and said second controllers exchange information to maintain optical signal output power, while gain slope is being changed. 8. The optical amplifier of claim 7 wherein said optical filter is being located ether in front of any of said gain stages, between any two of said gain stages, or downstream of any of said gain stages. 9. The optical device of claim 1, wherein said tunable optical filter has polarization mode dispersion is less than 0.05 ps. 10. The optical device of claim 1, wherein said tunable optical filter has a pseudo-parabolic insertion loss function, when measured in dB. 11. The optical device of claim 1, wherein said optical filter is a Mach-Zehnder interferometer and the single parameter that is changed is a relative phase accumulation between two arms of said Mach-Zehnder interferometer. 12. The optical device of claim 1, wherein the single parameter is varied as a function of temperature such that said tunable optical filter compensates for variations in the gain spectrum of said optical amplifier that occur as a function of operating temperature. 13. The optical device of claim 1, wherein said optical filter has a spectral filter function that is substantially symmetric about the central wavelength. 14. The optical device of claim 1, wherein said optical filter changes the gain slope or shape of said optical amplifier in response to a change in the input spectral signal content that occurs as a result of variations of loss in an optical fiber span of an optical system in which the optical amplifier is utilized. 15. The optical device of claim 1, wherein said tunable optical filter is at least partially implemented using a multi-clad waveguide. 16. The optical device of claim 1, wherein said tunable optical filter is at least partially implemented in a planar waveguide. 17. The optical device of claim 1, wherein said tunable optical filter is at least partially implemented as a dielectric stack filter with fixed layer thickness without an air gap and with fixed layer thicknesses. 18. The optical device of claim 1, wherein said tunable optical filter is utilized when optical input signal power to said tunable optical filter is at least 300 mW. 19. The optical device of claim 1, wherein said tunable optical filter has polarizat