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

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...

AI Technical Summary

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

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