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Overview: With the rapid development of computer vision and digital media, image retrieval has been successfully applied to search engines, digital libraries, medical image management, and other fields. For current color image retrieval, the extraction of a single image feature is often too limited, and it is difficult to achieve the purpose of efficient and fast retrieval. Color feature and directional gradient feature are two important features of an image, which are widely used in the field of image retrieval. Color information represents the overall features of the image, and the directional gradient feature represents the partial features information of the image by extracting the texture information of the image. Aiming at the problems of poor rotation change robustness, high feature dimension, and long retrieval time in current retrieval methods, a color image retrieval method that combines color feature with improved directional gradient feature is proposed. First, the input color image is converted into a grayscale image through Gaussian space, and the surface geometric curvature information and texture information of the grayscale image are extracted and integrated into the FHOG descriptor, and the main curvature information is multi-sampled to construct a mixed sampling direction gradient feature (P-FHOG1, P-FHOG2, P-FHOG3) based on the main curvature, and the improved directional gradient feature (P-FHOGs) based on the main curvature is obtained by merging the features of three scales. At the same time, the image is converted from RGB color space to HSV color space and the color information of the image is extracted after quantization to construct the color feature histogram, and the color feature of the image is obtained. On this basis, the two features are merged to obtain an image retrieval method based on color feature and improved direction gradient feature (CP-FHOG). The experiment was compared with the advanced image retrieval methods on the Corel-1000 and Coil-100 data sets, and the average accuracy rates of 85.89% and 93.38% were achieved, respectively. On the Corel-1000 data set, the features extraction time and retrieval time of the algorithm in this paper are 0.067 s and 0.048 s, respectively, which are improved by 0.075 s and 1.06 s, respectively, compared with the second-performing algorithm. At the same time, ablation experiments were performed in the two data sets to verify the effectiveness of the fusion algorithm. The experimental results show that, compared with HSV and P-FHOGs algorithms, CP-FHOG extracts richer detailed features, has stronger rotation robustness, and significantly improves retrieval accuracy in datasets containing complex backgrounds and targets with different rotation angles. Besides, retrieval time and feature dimension have also been greatly improved. The color image retrieval method proposed in this paper introduces main curvature information and color information based on FHOG descriptors, combines the advantages of color feature and directional gradient feature, and extracts rich overall and detailed features. The experimental result proves that the retrieval accuracy of the method in this paper is higher and the method has rotation robustness.
The spatial principal curvatures
The Hessian matrix at some point in the image
Flow chart of the FHOG descriptor extraction feature
Flow chart of the CP-FHOG algorithm
Extraction of the color features. (a) Input images; (b) RGB converted images; (c) HSV converted images
Feature fusion cascade histogram
Sample images of the Corel-1000 dataset
Sample images of the Coil-100 dataset
Influence for different δ and m on accuracy
Influence for different b on accuracy
The retrieval results of the Corel-1000 dataset. (a) Africans; (b) Flowers
Comparison of the ablation experiment results
Retrieval targets with different rotation angles