Retrieval of Images Using DCT and DCT Wavelet Over Image Blocks

Feature extraction is done in the following way; For approach1, image for which the feature vector is to be calculated is splited into R, G and B color components and for each

The Discrete Cosine Transform (DCT) has been widely used in the field of image compression because of its excellent energy compaction properties. It is an orthogonal

We consider the grayscale image as a set of cuts obtained from successive binarization for each gray level in image, and for each segmentation we compute the R-transform then

They provided an insight of optimization techniques including Ant Colony Optimization (ACO) algorithm, Harfmony Search Algorithm (HSA), Artificial Bee Colony (ABC)

The JPEG process is a widely used form of lossy image compression that centers on the Discrete Cosine Transform.. DCT and Fourier transforms convert images from spatial-domain to

Recently obtained image is further processed applying discrete wavelet transform on every row and results are presented on the Fig.8, showing estimated discrete wavelet

The algorithm encryption and decryption of an image transform an image into cipher code using the random keys, which allow users to have confidentiality and security in

We evaluated the performance of the combined DWT-DCT image watermarking algorithms using a 512 × 512 'Lena' as the original cover host image, and a 256 × 256