Authorization using an optical sensor

A method of authorizing a device action in an apparatus comprising a camera module and a host system, the method comprising:

• in the camera module:
• accessing a first baseline model that represents image characteristics of an authorized first user or object;
• using the first baseline model as a basis for selecting a first number of sensing structures of a camera image sensor, wherein the first number of sensing structures of the camera image sensor is less than a total number of sensing structures of the camera image sensor;
• activating the selected first number of sensing structures of the camera image sensor and obtaining therefrom a first image sensed by the activated first number of sensing structures;
• and
• comparing the first image with the first baseline model;
• and
• the method further comprising:
• activating a next round of authorization processing in the host system when an amount of correlation between the first image and the first baseline model satisfies a threshold correlation amount
• the host system consuming a higher amount of power than the camera module;
• the method further comprising, in the camera module:
• accessing a third baseline model that represents image characteristics of a background that is sensed when no authorized user or object is present;
• and
• comparing the first image with the third baseline model;
• and
• the method further comprising:
• activating the next round of authorization processing in the host system when a change to the first image is detected.

An electronic device for authorizing a device action, the electronic device comprising:

• a camera module;
• and
• a host system that consumes a higher amount of power than the camera module,
• the camera module being configured to:
• access a first baseline model that represents image characteristics of an authorized first user or object;
• use the first baseline model as a basis for selecting a first number of sensing structures of a camera image sensor, wherein the first number of sensing structures of the camera image sensor is less than a total number of sensing structures of the camera image sensor;
• activate the selected first number of sensing structures of the camera image sensor and to obtain therefrom a first image sensed by the activated first number of sensing structures;
• and
• compare the first image with the first baseline model;
• the electronic device being configured to:
• activate a next round of authorization processing when an amount of correlation between the first image and the first baseline model satisfies a threshold correlation amount;
• the electronic device further comprising circuitry configured to perform, when the amount of correlation between the first image and the first baseline model does not satisfy the threshold correlation amount:
• accessing a second baseline model that represents image characteristics of an authorized second user or object;
• using the second baseline model as a basis for selecting a third number of sensing structures of the camera image sensor, wherein the third number of sensing structures of the camera image sensor is less than the total number of sensing structures of the camera image sensor;
• activating the selected third number of sensing structures of the camera image sensor and obtaining therefrom a second image sensed by the activated second number of sensing structures;
• comparing the second image with the second baseline model;
• and
• activating the next round of authorization processing when an amount of correlation between the second image and the second baseline model satisfies the threshold correlation amount.

An electronic device for authorizing a device action, the electronic device comprising:

• a camera module;
• and
• a host system that consumes a higher amount of power than the camera module,
• the camera module being configured to:
• access a first baseline model that represents image characteristics of an authorized first user or object;
• use the first baseline model as a basis for selecting a first number of sensing structures of a camera image sensor, wherein the first number of sensing structures of the camera image sensor is less than a total number of sensing structures of the camera image sensor;
• activate the selected first number of sensing structures of the camera image sensor and to obtain therefrom a first image sensed by the activated first number of sensing structures;
• and
• compare the first image with the first baseline model;
• the electronic device being configured to:
• activate a next round of authorization processing when an amount of correlation between the first image and the first baseline model satisfies a threshold correlation amount:
• the camera module is configured to:
• access a third baseline model that represents image characteristics of a background that is sensed when no authorized user or object is present;
• and
• compare the first image with the third baseline model;
• and
• the electronic device is further configured to:
• activate the next round of authorization processing in the host system when a change to the first image is detected.