An image acquisition system comprising: - a matrix sensor comprising a two-dimensional arrangement of pixels, each pixel being adapted to generate an electrical signal representative of the light intensity at a point of an optical image of a scene; and - a signal processing circuit configured to process the electrical signals generated by said pixels so as to generate digital images (I VIS, I PIR) of said scene; wherein said matrix sensor comprises a two-dimensional arrangement: - of so-called colored pixels of at least one first type, sensitive to visible light in a first spectral band; a second type, sensitive to visible light in a second spectral band different from the first; and a third type, sensitive to visible light in a third spectral band different from the first and the second, a combination of the spectral bands of the different types of colored pixels reconstituting all of the visible spectrum; - and of so-called panchromatic pixels, sensitive to all the visible spectrum, at least the panchromatic pixels being also sensitive to the near-infrared; characterized in that said signal processing circuit is configured to: - reconstruct a first set of monochromatic images (IV PB, IB PB, IR PB) from the electrical signals generated exclusively by the colored pixels; - reconstruct a panchromatic image (IM PB) from the electrical signals generated by the panchromatic pixels; - reconstruct a second set of monochromatic images (IV* PB, IB* PB, IR* PB) from the electrical signals generated by the colored pixels, and from said panchromatic image; - reconstruct a color image (I VIS), substantially free of contributions originating from an infrared component of the optical image, by application of a first colorimetry matrix (MCol1) to the monochromatic images of the first set and to said panchromatic image; - reconstruct at least one image in the near-infrared (I PIR) by application of a second colorimetry matrix (MCol2) at least to the monochromatic images of the second set and to said panchromatic image; and - supply as output said color image and said or at least one said image in the near-infrared. - a matrix sensor comprising a two-dimensional arrangement of pixels, each pixel being adapted to generate an electrical signal representative of the light intensity at a point of an optical image of a scene; and - a signal processing circuit configured to process the electrical signals generated by said pixels so as to generate digital images (I VIS, I PIR) of said scene; - of so-called colored pixels of at least one first type, sensitive to visible light in a first spectral band; a second type, sensitive to visible light in a second spectral band different from the first; and a third type, sensitive to visible light in a third spectral band different from the first and the second, a combination of the spectral bands of the different types of colored pixels reconstituting all of the visible spectrum; - and of so-called panchromatic pixels, sensitive to all the visible spectrum, - reconstruct a first set of monochromatic images (IV PB, IB PB, IR PB) from the electrical signals generated exclusively by the colored pixels; - reconstruct a panchromatic image (IM PB) from the electrical signals generated by the panchromatic pixels; - reconstruct a second set of monochromatic images (IV* PB, IB* PB, IR* PB) from the electrical signals generated by the colored pixels, and from said panchromatic image; - reconstruct a color image (I VIS), substantially free of contributions originating from an infrared component of the optical image, by application of a first colorimetry matrix (MCol1) to the monochromatic images of the first set and to said panchromatic image; - reconstruct at least one image in the near-infrared (I PIR) by application of a second colorimetry matrix (MCol2) at least to the monochromatic images of the second set and to said panchromatic image; and - supply as output said color image and said or at least one said image in the near-infrared.