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This paper presents a method of analysis and processing of digital images, with a particular interest in the technique that uses the set of Gabor mathematical functions (Gabor wavelet). It also proposes a method of image indexing and searching, according to the information contained in the image. This information is defined by a signature obtained using a Gabor filter. Medicine represents a possible field of application, as different types of images that appear in this area may be therefore analyzed: x-rays, ultrasounds, NMR, etc.