Random number generator for multichannel image sensing device
AssigneeSamsung Electronics Co., Ltd.
InventorChanyoung Jang
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Abstract
An image sensing device includes a pixel array including a photoconverter configured to convert optical signals into analog electrical signals, an analog-digital converting (ADC) circuit configured to convert the analog electrical signals received from the pixel array into digital signals, an address bus, a random number generator configured to generate random numbers based on an input of least significant bits (LSBs) of a plurality of digital signals transmitted from the ADC circuit through the address bus, and a signal processor configured to perform image processing using the random numbers.
Claims19
An image sensing device, comprising:
- a pixel array comprising a photoconverter configured to convert optical signals into analog electrical signals;
- an analog-digital converting (ADC) circuit configured to convert the analog electrical signals received from the pixel array into digital signals;
- an address bus;
- a random number generator configured to generate random numbers based on an input of least significant bits (LSBs) of a plurality of digital signals transmitted from the ADC circuit through the address bus;
- and
- a signal processor configured to perform image processing using the random numbers,
- wherein the random number generator comprises:
- a random seed number generator configured to generate M random seed numbers based on the N LSBs, wherein N is a positive integer greater than one, and wherein M is a positive integer less than or equal to N;
- and
- a shift register configured to generate the random numbers based on the M random seed numbers.
An operating method of an image device, comprising:
- generating a plurality of analog electrical signals by a pixel array comprising a plurality of photoconverters that convert optical signals into the plurality of analog electrical signals;
- converting the plurality of analog electrical signals generated by the pixel array into a plurality of digital signals;
- receiving N least significant bit (LSB) values of the plurality of digital signals, N being a positive integer greater than one;
- generating M random seed numbers based on the N LSB values based on at least one of a brightness of an image and a gain of the image, wherein M is a positive integer less than or equal to N;
- and
- generating, by a linear feedback shift register, random numbers based on the M random seed numbers.
An image sensing device, comprising:
- a pixel array comprising a cluster cell in which a plurality of pixels of a same color are disposed adjacently;
- an analog-to-digital converting (ADC) circuit configured to convert a plurality of analog signals generated from the plurality of pixels into a plurality of digital signals;
- a random number generator configured to receive a plurality of least significant bits (LSBs) of the plurality of digital signals and generate random numbers based on the plurality of LSBs;
- and
- a signal processor configured to perform image processing using the random numbers,
- wherein the random number generator comprises:
- a random seed number generator configured to generate M random seed numbers based on the N LSBs, wherein N is a positive integer greater than one, and wherein M is a positive integer less than or equal to N;
- and
- a shift register configured to generate the random numbers based on the M random seed numbers.
Dependencies are inferred from the claim text.