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, poor correction effect, and target loss

Inactive Publication Date: 2012-12-26
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.
The OPC and TPC correction methods need to block the field of view when the system is working, which will affect the normal operation of the system and may cause the loss of the target in the target tracking and other occasions

Method used

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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 following examples are used to illustrate the application of the present invention. A refrigerated HgCdTe infrared thermal imager with a resolution of 320×240 was used for testing. The non-uniformity of this thermal imager is mainly represented by stripes and stripes. The existence of sex has caused serious interference to the observation field.

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

[0077] S1. Parameter matrix G obtained by initial radiometric calibration 0 , O 0 As a lookup table, as an initial calibration parameter;

[0078] S2. The black body field diaphragm of the frame extends under high and low temperature, and the gain correction parameters of the pixel field diaphragm under the black body of the frame are calculated. And offset correction parameters The black body field diaphragm of the border retracts immediately, such as figure 2 As shown, here, take the width of the...

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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 thermal imaging 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 an image formed by an infrared focal plane detector array (Infrared Focal Plane Arrays, IRFPA), which 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 It is widely used in the system. IRFPA can be divided into two types according to the array structure, one is linear array, and the other is staring area array. Among them, staring type area array detectors have been used more and more widely because of the omission of complex optical and mechanical scanning structures. [0003] Because the photoelectric response of thousands of detection elements to the same radiation input in IRFP...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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