Imaging apparatus and image signal processing device
First Claim
1. An imaging apparatus comprising:
- a solid-state image sensor having, in a two dimensional array, infrared light-receiving pixels having selective sensitivity to infrared light, and a plurality of types of color light-receiving pixels having sensitivity to the infrared light and to visible light of mutually different specific colors; and
an image signal processing circuit for generating a processed image signal for displaying an infrared composite image in which an enhanced infrared image is synthesized with and displayed on a visible image on the basis of a raw image signal that is output by the solid-state image sensor and is composed of an infrared pixel signal that corresponds to the infrared light-receiving pixels and a plurality of types of color pixel signals that corresponds to each of the color light-receiving pixels;
whereinthe image signal processing circuit performs;
a component image signal generation process for generating an infrared component image signal that corresponds to an infrared light component, and generating a plurality of types of color component image signals that corresponds to visible-light components of the specific colors on the basis of the infrared pixel signal and the color pixel signals;
an infrared composite process for synthesizing, for each of the specific colors, the color component image signal and a signal obtained by multiplying the infrared component image signal by a gain of the specific color in accordance with the manner in which the infrared image is enhanced, and generating a converted color component image signal of each of the specific colors; and
a processed image signal generation process for generating the processed image signal on the basis of the plurality of converted color component image signals.
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Abstract
Infrared light emitted by a fluorescent material is weak. When an infrared image obtained by this fluorescent material is superposed and displayed on a visible-light image, the infrared image is made clear. A signal <IR> of an IR pixel having selective sensitivity to infrared light is subtracted from RGB pixel signals <R>, <B>, and <G> of a solid-state image sensor by adders (20), and signals R0, G0, and B0 that correspond to the R, G, and B components of incident light within <R>, <G>, and <B> are separated and extracted. <IR> is multiplied by each of the gains κR, κG, and κB to enhance the IR component by multipliers (22), and each is synthesized with R0, G0, and B0 by adders (24). κR, κG, and κB are set so that the infrared image displayed on the visible-light image by the synthesized IR component is enhanced and displayed in a hue that can be distinguished from the color white or another visible-light image.
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Citations
10 Claims
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1. An imaging apparatus comprising:
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a solid-state image sensor having, in a two dimensional array, infrared light-receiving pixels having selective sensitivity to infrared light, and a plurality of types of color light-receiving pixels having sensitivity to the infrared light and to visible light of mutually different specific colors; and an image signal processing circuit for generating a processed image signal for displaying an infrared composite image in which an enhanced infrared image is synthesized with and displayed on a visible image on the basis of a raw image signal that is output by the solid-state image sensor and is composed of an infrared pixel signal that corresponds to the infrared light-receiving pixels and a plurality of types of color pixel signals that corresponds to each of the color light-receiving pixels;
whereinthe image signal processing circuit performs; a component image signal generation process for generating an infrared component image signal that corresponds to an infrared light component, and generating a plurality of types of color component image signals that corresponds to visible-light components of the specific colors on the basis of the infrared pixel signal and the color pixel signals; an infrared composite process for synthesizing, for each of the specific colors, the color component image signal and a signal obtained by multiplying the infrared component image signal by a gain of the specific color in accordance with the manner in which the infrared image is enhanced, and generating a converted color component image signal of each of the specific colors; and a processed image signal generation process for generating the processed image signal on the basis of the plurality of converted color component image signals.
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2. An imaging apparatus comprising:
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a solid-state image sensor having, in a two dimensional array, infrared light-receiving pixels having selective sensitivity to infrared light, and a plurality of types of color light-receiving pixels having sensitivity to the infrared light and to visible light of mutually different specific colors; and an image signal processing circuit for generating a processed image signal for displaying an infrared composite image in which an infrared image is synthesized with and displayed on a visible image on the basis of a raw image signal that is output by the solid-state image sensor and is composed of an infrared pixel signal that corresponds to the infrared light-receiving pixels and a plurality of types of color pixel signals that corresponds to each of the color light-receiving pixels;
whereinthe image signal processing circuit performs; a component image signal generation process for generating an infrared component image signal that corresponds to an infrared light component, and generating a plurality of types of color component image signals that corresponds to visible-light components of the specific colors on the basis of the infrared pixel signal and the color pixel signals; an intermediate image generation process for generating the intermediate image signal that corresponds to the visible-light image on the basis of the plurality of color component image signals; and a processed image signal generation process for generating the processed image signal by varying luminance or hue of each pixel that expresses the intermediate image signal in accordance with signal level of the infrared component image signal.
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3. An image signal processing device for generating a processed image signal for displaying an infrared composite image in which an enhanced infrared image is synthesized with and displayed on a visible image on the basis of a raw image signal that is output by an image sensor having, in a two dimensional array, infrared light-receiving pixels having selective sensitivity to infrared light, and a plurality of types of color light-receiving pixels having sensitivity to the infrared light and to visible light of mutually different specific colors, and that is composed of an infrared pixel signal that corresponds to the infrared light-receiving pixels and a plurality of types of color pixel signals that corresponds to each of the color light-receiving pixels;
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the device performs; a component image signal generation process for generating an infrared component image signal that corresponds to an infrared light component, and generating a plurality of types of color component image signals that corresponds to visible-light components of the specific colors on the basis of the infrared pixel signal and the color pixel signals; an infrared composite process for synthesizing, for each of the specific colors, the color component image signal and a signal obtained by multiplying the infrared component image signal by a gain of the specific color in accordance with the manner in which the infrared image is enhanced, and generating a converted color component image signal of each of the specific colors; and a processed image signal generation process for generating the processed image signal on the basis of the plurality of converted color component image signals. - View Dependent Claims (4, 5, 6, 7, 8)
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9. An image signal processing device for generating a processed image signal for displaying an infrared composite image in which an infrared image is synthesized with and displayed on a visible image on the basis of a raw image signal that is output by an image sensor having, in a two dimensional array, infrared light-receiving pixels having selective sensitivity to infrared light, and a plurality of types of color light-receiving pixels having sensitivity to the infrared light and to visible light of mutually different specific colors, and that is composed of an infrared pixel signal that corresponds to the infrared light-receiving pixels and a plurality of types of color pixel signals that corresponds to each of the color light-receiving pixels;
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the device performs; a component image signal generation process for generating an infrared component image signal that corresponds to an infrared light component, and generating a plurality of types of color component image signals that corresponds to visible-light components of the specific colors on the basis of the infrared pixel signal and the color pixel signals; an intermediate image generation process for generating the intermediate image signal that corresponds to the visible-light image on the basis of the plurality of color component image signals; and a processed image signal generation process for generating the processed image signal by varying luminance or hue of the pixels for displaying the intermediate image signal, in accordance with signal level of the infrared component image signal. - View Dependent Claims (10)
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Specification