A method for assisting in the detection of elements in an environment, the method being implemented by a detection assistance device comprising an image acquisition system and a computer, the image acquisition system comprising a first sensor and a second orientable sensor, the first sensor having a first field of view and a first resolution and being suitable for acquiring so-called wide-field images, the second sensor having a second field of view and a second resolution and being suitable for acquiring so-called narrow-field images, the second field of view being strictly less than the first field of view, the second resolution being finer than the first resolution, the method comprising: an initialization phase comprising: i. the acquisition by the first sensor of a first wide-field image of a first part of the environment, ii. scanning the environment by the second sensor so as to acquire a series of first narrow-field images (IMPC1) imaging different second parts of the environment so that all of the second parts of the environment imaged by the first narrow-field images (IMPC1) correspond to the first part of the environment imaged by the first wide-field image, iii. the generation, by the computer, of a fused image from the series of first narrow-field images (IMPC1), the fused image imaging the first part of the environment with a resolution equal to the second resolution, - an operating phase comprising at each moment: i. the acquisition by the first sensor of a second wide-field image of the first part of the environment, ii. in response to the detection of at least one difference relating to an element on the second wide-field image with respect to the wide-field image acquired at the previous moment (IMGC1), the acquisition by the second sensor, for each difference detected, of a second narrow-field image imaging the difference with the second resolution, and iii. for each detected difference, the update by the computer, of the corresponding part of the fused image with the corresponding second narrow-field image. i. the acquisition by the first sensor of a first wide-field image of a first part of the environment, ii. scanning the environment by the second sensor so as to acquire a series of first narrow-field images (IMPC1) imaging different second parts of the environment so that all of the second parts of the environment imaged by the first narrow-field images (IMPC1) correspond to the first part of the environment imaged by the first wide-field image, iii. the generation, by the computer, of a fused image from the series of first narrow-field images (IMPC1), the fused image imaging the first part of the environment with a resolution equal to the second resolution, - an operating phase comprising at each moment: i. the acquisition by the first sensor of a second wide-field image of the first part of the environment, ii. in response to the detection of at least one difference relating to an element on the second wide-field image with respect to the wide-field image acquired at the previous moment (IMGC1), the acquisition by the second sensor, for each difference detected, of a second narrow-field image imaging the difference with the second resolution, and iii. for each detected difference, the update by the computer, of the corresponding part of the fused image with the corresponding second narrow-field image. i. the acquisition by the first sensor of a second wide-field image of the first part of the environment, ii. in response to the detection of at least one difference relating to an element on the second wide-field image with respect to the wide-field image acquired at the previous moment (IMGC1), the acquisition by the second sensor, for each difference detected, of a second narrow-field image imaging the difference with the second resolution, and iii. for each detected difference, the update by the computer, of the corresponding part of the fused image with the corresponding second narrow-field image.