Infrared two-point non-uniform calibrating method based on frame black body field diaphragm

A technology of non-uniformity correction and field diaphragm, which is applied in the field of infrared thermal imaging, and can solve problems such as affecting the normal operation of the system, target loss, and poor correction effect

Inactive Publication Date: 2011-11-02
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

In the OPC method, the gain parameter G is considered to be equal to 1 when modeling, and only the influence of the bias factor is considered in the calculation, and the correction effect is worse than that of the TPC method.
T

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  • Infrared two-point non-uniform calibrating method based on frame black body field diaphragm
  • Infrared two-point non-uniform calibrating method based on frame black body field diaphragm
  • Infrared two-point non-uniform calibrating method based on frame black body field diaphragm

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Embodiment

[0075] The application of the present invention is described below in conjunction with examples, and a cooling type HgCdTe infrared thermal imager with a resolution of 320 × 240 has been tested. The presence of sex has seriously disturbed the observation field of view.

[0076] The update steps of IRFPA non-uniformity correction parameters based on frame black body are as follows: Figure 5 Shown:

[0077] S1. The parameter matrix G obtained by using the initial radiation calibration 0 , O 0 As a lookup table, as an initial calibration parameter;

[0078] S2. The field diaphragm of the frame black body is stretched out at high and low temperature, and the gain correction parameters of the pixel field diaphragm under the frame black body are calculated with bias correction parameters The frame blackbody field diaphragm is then retracted, as figure 2 As shown, here, take the width of the border c=15;

[0079] S3. Read in 20 frames of image data in each of the two scene...

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Abstract

The invention relates to an infrared two-point non-uniform calibrating method based on a frame black body field diaphragm, belonging to the field of infrared thermal imaging. The method comprises the following steps of: arranging an automatically-telescopic frame black body field diaphragm on a diaphragm of an infrared thermal imager and performing two-point calibration under a frame to obtain a gain calibration factor and an offset calibration factor of a detection unit under the coverage of a frame black body; acquiring f frames of initially-calibrated images respectively on two scenes to obtain f-1 groups of inter-frame displacement parameters on every scene; and acquiring calibration parameters of f-1 groups of images with inter-frame displacement on an internal detection unit by adopting an algebraic method, and averaging the frames to obtain finial calibration matrixes G and 0 for calibrating the entire field of a subsequent infrared video. The method has the advantages of rapidness, self-adaption and system miniaturization, and can be applied to the fields of designing, production and manufacturing of refrigerating and non-refrigerating infrared focal plane detector thermalimaging systems, satellite infrared thermal imaging systems, infrared alarm systems, scientific researches and the like.

Description

technical field [0001] The invention relates to a non-uniformity correction method for images formed by infrared focal plane detector arrays (Infrared Focal Plane Arrays, IRFPA), and belongs to the field of infrared thermal imaging. Background technique [0002] Infrared focal plane detector array (IRFPA) has the advantages of simple structure, strong detection ability, low power consumption, high frame rate, and good stability. It is used in infrared search systems, airborne forward-looking infrared systems, imaging seekers and imaging tracking widely used in the system. IRFPA can be divided into two types according to the array structure, one is a linear array, and the other is a staring area array. Among them, the staring area detector is more and more widely used because it omits the complex optical-mechanical scanning structure. [0003] Since the photoelectric responses of thousands of detector elements in IRFPA to the same radiation input are inconsistent, the image...

Claims

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Application Information

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IPC IPC(8): G01J5/00
Inventor 刘崇亮金伟其修金利刘秀王霞
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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