In DCT coding of an image, the image is divided into squareblocks, and variable-separation two-dimensional DCT is applied, withone-dimensional DCTs applied to the Rows and columns in cascade. Inthe variable-separation Transform, the power packing efficiency islow at the edge In the slant ...
The discrete cosine transform (DCT) represents an image as a sum of sinusoids of varying magnitudes and frequencies. 翻译结果5复制译文编辑译文朗读译文返回顶部 The discrete cosine transform (DCT) represents an image as a sum of sinusoids of varying magnitudes and frequencies. 相关内容 aWe saw a ...
Feature extraction is a critical element in the design of image self-recovery and watermarking algorithms and its quality can have a big influence on the performance of these processes. The objective of the work presented in this thesis is to develop an effective methodology for feature extraction...
The overlay is applied with the modjpeg CLI program, that uses libmodjpeg in order to apply an overlay to a JPEG image. The quality settings of the original image can remain unknown. Changes to the image will only happen where the overlay is applied. The overlay itself will experience a ...
With this approach we are developing an application for copyright protection and X-ray medical application too .For further security we are using ZIP Compression Technique. In effect, the main purpose of image compression is to trim down redundancy of the image data in order to be able to ...
First, the plain image is pre-encrypted into a noise-like image, and then embedded into a carrier image to generate a visually meaningful cipher image. To a certain extent, this scheme guarantees the visual security of the cipher image to avoid arousing the suspicion of an attacker. It is ...
ImageCompression This code reads an image as a matrix and applies discrete cosine transform on it. Then, user needs to enter the quality factor he/she want for the compressed image. Predifined quantification matrix does the job of quantifying the image after dct. Now, we just need to get ...
Furthermore, a simple delta modulation scheme is performed on the coefficients that exploits correlation between high energy DCT coefficients in neighboring blocks of an image. The resulting sequence is compressed by using an entropy coder, and simulations show the results to be promising and more ...
In this paper, an image retrieval scheme has been proposed based on block level hybrid features. The block level salient feature are extracted in two parts: first level features are formed after the application of DCT and second level features are obtained after the processing of SVD. In the ...
Although this reduces the flexibility in the architecture for supporting different block sizes, but this cost pays off due to the high gain in the computational efficiency of fixed coefficient CSD multipliers. Using architectural schemes like pipelining/interleaving, the computation of an 8/spl times/...