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Column noise elimination method of a quantum image sensor based on a guide filter

A guided filter and quantum image technology, applied in the field of image processing, can solve the problem of reducing the quality of QIS imaging and achieve the effect of eliminating column noise

Pending Publication Date: 2019-06-11
TIANJIN UNIV
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Problems solved by technology

[0003] In the actual QIS imaging system, QIS adopts the circuit structure of large array oversampling and column readout. Due to the mismatch of the period and the deviation of the manufacturing process, the readout noise of the pixel and the ADC bias voltage of the readout circuit are different. Therefore, the quantization of single photons will generate non-stationary column fringe noise, and its existence will seriously reduce the imaging quality of QIS

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  • Column noise elimination method of a quantum image sensor based on a guide filter
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  • Column noise elimination method of a quantum image sensor based on a guide filter

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[0020] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0021] Such as figure 1 Shown, the column noise elimination method of the quantum image sensor based on guided filter of the present invention, comprises the following steps:

[0022] First, the column noise model of QIS is modeled: the actual output image is represented by c(m, n) as follows,

[0023] c(m,n)=h(m,n)+s(m,n) (1)

[0024] where h(m,n) is the high-frequency component of the image c(m,n), s(m,n) is the smoothed version of the image except for the high-frequency component, and m×n is the output image c(m,n) resolution.

[0025] In the present invention, the filter used is a guided filter.

[0026] Define the guided filter, the guided filter smoothes the input image p u...

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Abstract

The invention discloses a column noise elimination method of a quantum image sensor based on a guide filter. The method comprises the following steps: filtering a QIS single-frame image containing column noise by using a one-dimensional guide filter under a first set parameter, and separating a high-frequency component in the QIS single-frame image from an image smooth part to obtain a high-frequency component of the QIS single-frame image; Performing guided filtering on the high-frequency component by using the one-dimensional guided filter under a second set parameter, and separating columnnoise in the high-frequency component from a predetermined image smooth part to obtain a required noise component; And calculating a column mean value of the obtained noise components to obtain a column noise vector, and subtracting the column noise vector from the sensor output image to obtain a de-column noise image. The method has a good removal effect on the non-fixed column stripe noise of the QIS, and the algorithm is fast and effective.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to a column noise elimination method of a quantum image sensor based on a guiding filter. Background technique [0002] Quantum image sensor (QIS) has three characteristics: single photon counting, spatial oversampling, and temporal oversampling. Compared with the classic CMOS image sensor, the pixel called "jot" of QIS has sub-diffraction limit, high conversion gain, and low full well capacity, so QIS should have ultra-low readout noise, ultra-large dynamic range, ultra-high Excellent image resolution and ultra-fast frame rate, so it will greatly improve the quality of image acquisition in many special environments, such as low-light environment imaging, high-speed moving object capture, high-contrast imaging, etc., and has broad application prospects. [0003] In the actual QIS imaging system, QIS adopts the circuit structure of large array oversampling and column readou...

Claims

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Application Information

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IPC IPC(8): G06T3/20G06T3/40G06T5/00G06T7/40
Inventor 高静杜啸星徐江涛聂凯明史再峰
Owner TIANJIN UNIV
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