An analysis unit for assessment of hair condition, the analysis unit comprising a map processor, the map processor being arranged to at least: - obtain a first follicular map representing a first plurality of hair root positions in a first videodermoscopy image, and - analyse at least the first follicular map to determine an analysis result suitable for assessment of hair condition, characterized in that the analysis unit further comprises a zero-loss processor (ZERPROC), - the zero-loss processor comprising an input image processor, a matching unit, and a follicular map combiner, - the zero-loss processor being arranged to receive a plurality of first videodermoscopy input images captured as a sequence of videodermoscopy images while rearranging the camera used for capturing the videodermoscopy images and/or the hair in between successive images, - the input image processor being arranged to perform an image processing algorithm on each of the first videodermoscopy input images of the plurality of first videodermoscopy input images (IMA1, IMA2) to generate a plurality of first follicular maps (FM1A, FM1B), each first follicular map representing a first plurality of hair root positions in the corresponding first videodermoscopy input image, - the matching unit of the zero-loss processor being arranged to at least relate hair root positions in a second map of the plurality of first follicular maps to hair root positions of a first map in at least a common skin area of the first map and the second map to determine a plurality of related hair root positions, - the follicular map combiner being arranged to identify which hair root positions in a first map (FM1A) of the plurality of first follicular maps do not appear in a second map (FM1B) of the plurality of first follicular maps and vice versa, adding the hair root positions that do not appear in the first map (FM1A) but that do appear in the second map (FM1B) to the hair root positions in the first map (FM1A) to determine a combined first follicular map from the plurality of first follicular maps, and - the zero-loss processor being arranged to output the combined first follicular map for use as the first follicular map. - obtain a first follicular map representing a first plurality of hair root positions in a first videodermoscopy image, and - analyse at least the first follicular map to determine an analysis result suitable for assessment of hair condition, - the zero-loss processor comprising an input image processor, a matching unit, and a follicular map combiner, - the zero-loss processor being arranged to receive a plurality of first videodermoscopy input images captured as a sequence of videodermoscopy images while rearranging the camera used for capturing the videodermoscopy images and/or the hair in between successive images, - the input image processor being arranged to perform an image processing algorithm on each of the first videodermoscopy input images of the plurality of first videodermoscopy input images (IMA1, IMA2) to generate a plurality of first follicular maps (FM1A, FM1B), each first follicular map representing a first plurality of hair root positions in the corresponding first videodermoscopy input image, - the matching unit of the zero-loss processor being arranged to at least relate hair root positions in a second map of the plurality of first follicular maps to hair root positions of a first map in at least a common skin area of the first map and the second map to determine a plurality of related hair root positions, - the follicular map combiner being arranged to identify which hair root positions in a first map (FM1A) of the plurality of first follicular maps do not appear in a second map (FM1B) of the plurality of first follicular maps and vice versa, adding the hair root positions that do not appear in the first map (FM1A) but that do appear in the second map (FM1B) to the hair root positions in the first map (FM1A) to determine a combined first follicular map from the plurality of first follicular maps, and - the input image processor being arranged to perform an image processing algorithm on each of the first videodermoscopy input images of the plurality of first videodermoscopy input images (IMA1, IMA2) to generate a plurality of first follicular maps (FM1A, FM1B), each first follicular map representing a first plurality of hair root positions in the corresponding first videodermoscopy input image, - the matching unit of the zero-loss processor being arranged to at least relate hair root positions in a second map of the plurality of first follicular maps to hair root positions of a first map in at least a common skin area of the first map and the second map to determine a plurality of related hair root positions, - the follicular map combiner being arranged to identify which hair root positions in a first map (FM1A) of the plurality of first follicular maps do not appear in a second map (FM1B) of the plurality of first follicular maps and vice versa, adding the hair root positions that do not appear in the first map (FM1A) but that do appear in the second map (FM1B) to the hair root positions in the first map (FM1A) to determine a combined first follicular map from the plurality of first follicular maps, and - the zero-loss processor being arranged to output the combined first follicular map for use as the first follicular map.