Color and grey level object retrieval using a 3D representation of force histogram

https://doi.org/10.1016/S0262-8856(03)00016-7Get rights and content

Abstract

A new method for both grey level and color object retrieval is presented in this paper. Our feature is based on previous works on force histogram notion which is extended here to handle with photometric information. This kind of feature has low computing time and allows keeping fundamental geometric transformations as scale, translation, symmetry and rotation. More precisely objects processed by defining a tridimensional signature which takes into account their photometric variations and their shapes. Experimental results show the promising aspect of our approach.

Introduction

A new approach for the content-based retrieval problem is presented in this paper. Our feature is based on force histogram introduced by Matsakis and Wendling [18], [19] which allows keeping fundamental geometric transformations as scale factor, translation, rotation and symmetry. It has been shown in previous works that such a feature is a powerful tool to define spatial relations [18], [19] between objects and also to describe robust signatures for binary objects [19], [35]. In this paper we show that such a notion can be extended to retrieve both grey level and color objects by including photometric variations in the force histogram. First, a brief overview of content-based retrieval approaches is given in Section 2. Then, the definition of a force histogram and its main properties are recalled in Section 3. The calculation of F3D-signatures on grey level and color objects is presented in Section 4. The measure of similarity between two F3D-signatures is given in Section 5. Finally, some experimental studies using image databases and a discussion about the advantages and the limits of our approach are provided in Section 6.

Section snippets

Related woks

More and more content-based image retrieval systems have been developed in the early years [29]. Full overviews concerning the indexing problem can be found in the literature [1], [11], [29]. Some systems allow querying by keywords, assuming that each image has been manually indexed when inserted into the database. Others systems often use one or more features to describe the content of images in order to provide an automatic content-based retrieval process. We give here a succinct description

Description of the method

In this section, the scheme for computing the F-signature of a binary graphical object, which is a particular histogram of forces [18], [19], [35] is recalled. A histogram of forces can be assumed to be the calculation of all the forces exerted between the pixels of a same object. Let ϕr be the map from R into R+, null on R and continuous on R+, such that:∀d∈R+,ϕr(d)=1/drLet a1 and a2 be two points of R2, and d be the distance between a1 and a2. The attraction force is given by ϕ(d). The

Usefulness

It is possible to integrate the photometric variations during the definition of a F2D-signature. In this case the grey level difference between two consecutive cuts should be processed. Actually two kinds of schemes may be used to handle the level cuts αi using force histogram [18]. The first directly derives from the generic double sum scheme defined by Dubois and Jaulent [8] and has a high processing time. We have then used the simple sum scheme, proposed by Khrisnapuram et al. [13] which

Butterfly database

We have used a database provided by Derrode et al. [7]. It consists of around a hundred of images of butterflies describing several clusters following different scales and orientations. Fig. 6 presents four types of butterflies with their associated F3D-signatures.

Fig. 7 gives the nine nearest images of butterfly pap28_1 and the scores reached. We can see that for each image the results provided are right and both the scale and the rotation factors are taken into account by our approach.

The

Conclusion

We have shown in this paper that an F3D-signature allows to reach a fast and robust retrieval using both color and grey level objects. Preliminary tests were performed on color photos. Currently, we search to extend our approach to the main regions of an image. The study of fast methods of ‘rough’ segmentation of the image is under consideration. The main connected regions obtained will be used like masks and the F3D-signatures computed on them will be matched with the database. Such an

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