WEARABLE INFORMATION SYSTEM HAVING AT LEAST ONE CAMERA

1 .- 21 . (canceled)

22 . An information system, comprising:

a camera;

a processor operatively coupled to the camera;

a device operatively coupled to the processor; and

a memory device operatively coupled to the camera, the processor and the device, the memory device comprising instructions executable by the processor to:

obtain, in a low-power mode of the information system, an image captured by the camera;

extract, in the low-power mode, a first feature of an object in the image;

generate, in the low-power mode, a higher level descriptor of the first feature;

cause, in the low-power mode, the device to determine that the higher level descriptor matches a reference object feature descriptor; and

activate, in response to determining the higher level descriptor matches the reference object feature descriptor, a high-power mode of the information system.

23 . The information system of claim 22 , wherein the device determines that at least one of the higher level descriptors matches a reference object feature descriptor by:

loading a plurality of reference object feature descriptors into a memory of the device;

loading the higher level descriptor for the first feature;

determining a distance measure between the higher level descriptor and each of the plurality of reference object feature descriptors; and

calculating a check parameter to determine whether the higher level descriptor is a valid match for at least one of the plurality of reference object feature descriptors.

24 . The information system of claim 22 , wherein in the low-power mode a clock rate of the processor is lower than in the high-power mode.

25 . The information system of claim 22 , wherein the first feature comprises a point-feature.

26 . The information system according to claim 22 , wherein the higher level descriptor comprises a scale-invariant feature descriptor.

27 . The information system according to claim 22 , wherein the higher level descriptor comprises a rotation-invariant feature descriptor.

28 . The information system according to claim 22 , further comprising instructions to cause the processor to display, in the high-power mode, augmented reality information related to the object.

29 . The information system of claim 22 , wherein the processor comprises one or more processors.

30 . The information system of claim 29 , wherein the instructions to cause the one or more processors to extract a first feature of an object in the image comprise instructions to cause the one or more processors to extract one or more features of the object in the image.

31 . A computer readable medium comprising computer readable code executable by a processor to:

obtain, in a low-power mode of a system, an image captured by the camera;

extract, in the low-power mode, a first feature of an object in the image;

generate, in the low-power mode, a higher level descriptor of the first feature;

cause, in the low-power mode, a device to determine that the higher level descriptor matches a reference object feature descriptor; and

activate, in response to determining the higher level descriptor matches the reference object feature descriptor, a high-power mode of the information system.

32 . The computer readable medium of claim 31 , wherein the device determines that at least one of the higher level descriptors matches a reference object feature descriptor by:

loading a plurality of reference object feature descriptors into a memory of the device;

loading the higher level descriptor for the first feature;

determining a distance measure between the higher level descriptor and each of the plurality of reference object feature descriptors; and

calculating a check parameter to determine whether the higher level descriptor is a valid match for at least one of the plurality of reference object feature descriptors.

33 . The computer readable medium of claim 31 , wherein in the low-power mode a clock rate of the processor is lower than in the high-power mode.

34 . The computer readable medium of claim 31 , wherein the first feature comprises a point-feature.

35 . The computer readable medium of claim 31 , wherein the higher level descriptor comprises a scale-invariant feature descriptor.

36 . The computer readable medium of claim 31 , wherein the higher level descriptor comprises a rotation-invariant feature descriptor.

37 . The computer readable medium of claim 31 , further comprising computer readable code to cause the processor to display, in the high-power mode, augmented reality information related to the object.

38 . A method for managing a low-power and high-power mode of a system, comprising:

obtaining, in a low-power mode of a system, an image captured by the camera;

extracting, in the low-power mode, a first feature of an object in the image;

generating, in the low-power mode, a higher level descriptor of the first feature;

causing, in the low-power mode, a device to determine that the higher level descriptor matches a reference object feature descriptor; and

activating, in response to determining the higher level descriptor matches the reference object feature descriptor, a high-power mode of the information system.

39 . The method of claim 38 , wherein the device determines that at least one of the higher level descriptors matches a reference object feature descriptor by:

loading a plurality of reference object feature descriptors into a memory of the device;

loading the higher level descriptor for the first feature;

determining a distance measure between the higher level descriptor and each of the plurality of reference object feature descriptors; and

calculating a check parameter to determine whether the higher level descriptor is a valid match for at least one of the plurality of reference object feature descriptors.

40 . The method of claim 38 , wherein the higher level descriptor comprises a scale-invariant feature descriptor.

41 . The method of claim 38 , further comprising displaying, in the high-power mode, augmented reality information related to the object.