Method and device for suppressing electromagnetic background radiation in an image
First Claim
1. Method for suppressing electromagnetic background radiation (2) in a defined spectral range (P) relative to a signal to be detected, in particular, for position determination of a laser spot (3), comprising means for recording electromagnetic radiation (6), preferably comprising at least one detector (6a, 6b) consisting of a plurality of components, and comprising means for signal and information processing (7), at least one uni-dimensional or multidimensional P-image (A) for the defined spectral range (P) and at least one uni-dimensional or multidimensional N-image (B) for at least one further defined spectral range (N1, N2) differing from that of the P-image (A) being recorded by the means for recording electromagnetic radiation (6), preferably at the same time, characterized in that the image brightness SSP of the background radiation (2) in the P-image (A) is deduced and the signal to be detected is extracted by the means for signal and information processing (7) from the N-image (B) on the basis of a model of the spectral distribution of the background radiation (2), the spectral ranges (P, N1, N2) of the P-image (A) and of the N-image (B) being determined as a two-band neighbourhood method by the choice of a wavelength band in each case for the P-image (A) and the N-image (B) , and the wavelength band of the N-image (B) being either on the short-wave or on the long-wave side of the wavelength band of the P-image (A) and preferably an overlap of the two wavelength bands being minimized.
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Abstract
The invention relates to a method and a corresponding device with which images (A, B) for the same sensing range, however in different wavelength ranges (P, N1, N2), are recorded at the same time or about the same time, and with which a signal to be detected is recorded for an image (A) serving as a P-image, and the wavelength of the signal is suppressed for an image (B) serving as an N-image. The intensity of the background in the P-image (A) is deduced from the N-image (B) while using a model for the interfering radiation or background radiation (2). The position of the signal to be detected is determined by comparing the image contents of the P-image (A) and the background image (C) derived from the N-image (B).
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Citations
11 Claims
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1. Method for suppressing electromagnetic background radiation (2) in a defined spectral range (P) relative to a signal to be detected, in particular, for position determination of a laser spot (3),
comprising means for recording electromagnetic radiation (6), preferably comprising at least one detector (6a, 6b) consisting of a plurality of components, and comprising means for signal and information processing (7), at least one uni-dimensional or multidimensional P-image (A) for the defined spectral range (P) and at least one uni-dimensional or multidimensional N-image (B) for at least one further defined spectral range (N1, N2) differing from that of the P-image (A) being recorded by the means for recording electromagnetic radiation (6), preferably at the same time, characterized in that the image brightness SSP of the background radiation (2) in the P-image (A) is deduced and the signal to be detected is extracted by the means for signal and information processing (7) from the N-image (B) on the basis of a model of the spectral distribution of the background radiation (2), the spectral ranges (P, N1, N2) of the P-image (A) and of the N-image (B) being determined as a two-band neighbourhood method by the choice of a wavelength band in each case for the P-image (A) and the N-image (B) , and the wavelength band of the N-image (B) being either on the short-wave or on the long-wave side of the wavelength band of the P-image (A) and preferably an overlap of the two wavelength bands being minimized.
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2. Method for suppressing electromagnetic background radiation (2) in a defined spectral range (P) relative to a signal to be detected, in particular for position determination of a laser spot (3),
comprising means for recording electromagnetic radiation (6), preferably comprising at least one detector (6a, 6b) consisting of a plurality of components, and comprising means for signal and information processing (7), at least one uni-dimensional or multidimensional P-image (A) for the defined spectral range (P) and at least one uni-dimensional or multi-dimensional N-image (B) for at least one further defined spectral range (N1, N2) differing from that of the P-image (A) being recorded by the means for recording electromagnetic radiation (6), preferably at the same time, characterized in that the image brightness SSP of the background radiation (2) in the P-image (A) is deduced and the signal to be detected is extracted by the means for signal and information processing (7) from the N-image (B) on the basis of a model of the spectral distribution of the background radiation (2), the spectral ranges (P, N1, N2) of the P-image (A) and of the N-image (B) being determined by the choice of at least one wavelength band in each case for the P-image (A) and the N-image (B), the wavelength bands each sensing different lines (1, 5a, 5b).
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6. Device for suppressing electromagnetic background radiation (2) in a defined spectral range (P) relative to a signal to be detected, in particular for position determination of a laser spot (3) to be detected,
comprising means for recording electromagnetic radiation (6), and comprising means for signal and information processing (7), the means for recording electromagnetic radiation (6) being designed for, preferably simultaneous, recording of at least one P-image (A) and at least one N-image (B) and the means for signal and information processing (7) being designed so that electromagnetic background radiation (2) can be suppressed from the different content of P-image (A) and N-image (B) adjusted by the means for signal and information processing (7), characterized in that the means for recording electromagnetic radiation (6) have at least two detectors for recording images (A, B) in at least two different, defined spectral ranges (P, N1, N2) and the means for signal and information processing (7) are designed so that the electromagnetic background radiation (2) can be suppressed on the basis of a model of the spectral distribution of the background radiation (2).
Specification