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A focal plane array non-uniformity correction method and correction circuit

A technology of non-uniformity correction and focal plane array, applied in the direction of TV, electrical components, color TV, etc., can solve the problems of increased complexity, imaging system volume, power consumption, etc., and achieve low power consumption and area consumption, The effect of simple structure

Active Publication Date: 2021-09-21
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Therefore, the two non-uniformity correction methods currently used require the support of off-chip image processing ASIC or FPGA, which leads to larger volume, power consumption and complexity of the imaging system

Method used

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  • A focal plane array non-uniformity correction method and correction circuit
  • A focal plane array non-uniformity correction method and correction circuit
  • A focal plane array non-uniformity correction method and correction circuit

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Embodiment 1

[0044] like Figure 1 to Figure 3 As shown in the present invention, a focal plane array non-uniformity correction method, the focal plane array detector includes a pixel array receiving signal radiation and a readout circuit that collects data generated by the pixel and realizes amplified output. A non-uniformity correction module is integrated in the output circuit.

[0045] In a focal plane array with a size of M×N, a single array pixel is named P(i, j), which represents the pixel located in the i-th row and the j-th column;

[0046] Each pixel in the focal plane array outputs an n-bit digitized signal, named D(i, j);

[0047] The focal plane array detector inputs parameter adjustment data framedata for each frame, where framedata[n] sets whether the focal plane array detector is in the non-uniformity correction adjustment mode, and framedata[n-1:0] is the image in the non-uniformity correction adjustment mode Target value for meta output data.

[0048] The focal plane a...

Embodiment 2

[0061] like image 3 As shown, the difference between this embodiment and Embodiment 1 is that the present invention also provides a correction circuit for implementing the focal plane array non-uniformity correction method of Embodiment 1, including:

[0062] The first correction module is used to compare the size of the pixel output value and the pixel output target value under the bias voltage Vdac, and the result is used to adjust the value of the voltage Vdac to the non-uniformity in the pixel bias circuit regulation; and:

[0063] The second correction module is used to convert the updated configdata value into an analog signal Vdac according to the size of the comparison result of the first correction module, and load it into the pixel bias circuit to realize the non-uniformity in the pixel bias circuit Adjustment of the sex regulation voltage Vdac.

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Abstract

The invention discloses a focal plane array non-uniformity correction method and a correction circuit. The invention integrates a non-uniformity correction module in the focal plane array readout circuit, and the non-uniformity correction module reads out the focal plane row by row The digitized output signal of each array pixel in the array, and the digitized output signal is compared with the preset pixel output target value, and according to the comparison result, the non-uniformity in the jth column pixel array bias circuit is adjusted The voltage value of the voltage is adjusted continuously until the focal plane array detector is no longer in the non-uniformity correction adjustment mode, the non-uniformity correction module stops working, and the non-uniformity correction is completed. The non-uniformity correction module adopted by the non-uniformity correction method of the present invention has a simple structure, low power consumption and area consumption; the focal plane array detector itself can realize non-uniformity correction, and no external input of non-uniformity correction parameters or Non-uniformity processing is performed on the output image again.

Description

technical field [0001] The invention relates to the technical fields of microelectronics and optoelectronics, in particular to a focal plane array non-uniformity correction method and a correction circuit. Background technique [0002] The focal plane array detector is a detector that converts infrared, visible light, ultraviolet and other signals into electrical signals through photoelectric conversion, and processes them to obtain video images of objects. Its core components include a pixel array that receives signal radiation and a readout circuit (ROIC: Read-Out Integrated Circuits) that collects the data generated by the pixel and realizes the amplified output. [0003] The focal plane array pixel is a sensitive unit with double-layer or multi-layer micro-bridge structure and umbrella structure processed by MEMS technology, and its size can be as small as several microns. An array composed of a large number of pixels is called a focal plane array. At present, with the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/365H04N5/378
CPCH04N25/671H04N25/75
Inventor 谢光忠李小飞杨凯鲁竟原阙隆成
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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