Discrete cosine transform - Wikipedia
A discrete cosine transform (DCT) expresses a finite sequence of data points in terms of a sum of cosine functions oscillating at different frequencies. The DCT, first proposed by Nasir Ahmed …
离散余弦变换（DCT）与 量化表 与 块伪影网络（RAG）
2024年2月21日 · 离散余弦变换（dct）是一种广泛应用于图像与视频压缩中的变换编码方法。它利用三角函数进行变换，并将幅度变成频率。dct 变换的基向量由余弦函数构成，一维 dct 变换 …
离散余弦变换 DCT 基本原理及 Python 代码实现 - CSDN博客
2024年5月27日 · 本篇将深入探讨如何使用Python编程语言结合离散余弦变换（Discrete Cosine Transform, DCT）原理来实现一个可见水印的添加功能。DCT是一种信号处理技术，广泛应用 …
DCT Based Compression • HVS response is dependent on spatial frequency. • We decompose the image into a set of waveforms, each with a particular spatial frequency • DCT is a real …
Discrete Cosine Transform (Algorithm and Program)
2022年8月5日 · To perform DCT Transformation on an image, first we have to fetch image file information (pixel value in term of integer having range 0 – 255) which we divides in block of 8 …
Fast computation of DCT by statistic adapted look-up tables
A fast algorithm to compute the discrete cosine transform (DCT) for video compression is presented. We replace the multiplications, which are the most time-consuming steps, by look …
DCT变换与量化在图像压缩中的应用解析-CSDN博客
2023年11月21日 · dct是图像处理中常用的有损压缩方法，能够将图像数据转换成频域表示，去除冗余信息以实现高效的数据编码和压缩。文章详细描述了元胞数组在处理中的应用，dct变换 …
Computing the 2D DCT • Factoring reduces problem to a series of 1D DCTs: – apply 1D DCT (Vertically) to Columns – apply 1D DCT (Horizontally) to resultant Vertical DCT • Or …
Optimum DCT quantization | IEEE Conference Publication - IEEE …
1993年3月30日 · The paper offers a solution to the problem of determining good quantization tables for use with the discrete cosine transform. Using the methods proposed, the designer of …
RD-OPT: an efficient algorithm for optimizing DCT quantization tables …
In this paper we describe RD-OPT, an efficient algorithm for constructing DCT quantization tables with optimal rate-distortion tradeoffs for a given image. The algorithm uses DCT coefficient …