A method of enhancing an infrared image, comprising: receiving a first image of a scene, wherein the first image is a visual image captured using a visual image sensor; receiving a second image of the scene, wherein the second image is an infrared image captured using an infrared image sensor, and wherein the resolution of the captured infrared image is lower than the resolution of the captured visual image; extracting high spatial frequency content from said visual image, wherein the high spatial frequency content includes edges and/or contours of the visual image; up-sampling the IR image through interpolation, either to the resolution of the visual image or to another resolution to which also the visual image is sampled; low pass filtering the up-sampled IR image to reduce noise in the up-sampled IR image and/or blur the up-sampled IR image; and combining the extracted high spatial frequency content from said visual image with said processed IR image to further increase the level of detail of the IR image and generate a combined image, wherein an increased clarity in the combined image comes both from said extracted high spatial frequency content from said visual image, showing the contours and edges from objects of the original visual image to enable a viewer to see further details of the visual image not shown in the IR image, and said steps of up-sampling and low pass filtering the IR image, said steps of up-sampling and low pass filtering providing an IR image with higher resolution and where sharp edges and noise visible in the IR image are removed or at least diminished, thereby reducing the risk of double edges showing up in the combined image where the visual image and the IR image are not aligned. receiving a first image of a scene, wherein the first image is a visual image captured using a visual image sensor; receiving a second image of the scene, wherein the second image is an infrared image captured using an infrared image sensor, and wherein the resolution of the captured infrared image is lower than the resolution of the captured visual image; extracting high spatial frequency content from said visual image, wherein the high spatial frequency content includes edges and/or contours of the visual image; up-sampling the IR image through interpolation, either to the resolution of the visual image or to another resolution to which also the visual image is sampled; low pass filtering the up-sampled IR image to reduce noise in the up-sampled IR image and/or blur the up-sampled IR image; and combining the extracted high spatial frequency content from said visual image with said processed IR image to further increase the level of detail of the IR image and generate a combined image, wherein an increased clarity in the combined image comes both from said extracted high spatial frequency content from said visual image, showing the contours and edges from objects of the original visual image to enable a viewer to see further details of the visual image not shown in the IR image, and said steps of up-sampling and low pass filtering the IR image, said steps of up-sampling and low pass filtering providing an IR image with higher resolution and where sharp edges and noise visible in the IR image are removed or at least diminished, thereby reducing the risk of double edges showing up in the combined image where the visual image and the IR image are not aligned.