数字图像(digital image)是指以二维数字组形式表示的图像,是不同亮度或不同颜色组成的矩阵,可以通过数字相机、扫描仪直接获得,或者扫描光学影像的底片经采样量化后获得。 数字图像处理(digital image proces…
IDFT则将频域表示的信号转换回空间域,恢复原始信号。通过DFT和IDFT,我们可以在图像处理中实现频域分析和处理,例如去除噪声、增强特定频率成分等。这些变换在数字图像处理中扮演着重要角色,能够帮助我们理解和改善图像质量。DFT And IDFT in digital image processing ...
The Discrete Fourier transform (DFT) is an important tool in digital signal processing. In this paper, a novel approach to DFT is proposed. The computation of DFT is transformed to the computation of the first-order moments by the simple mathematical deductions. It is well known that the firs...
Gonzalez R. C. and Woods R. E. Digital Image Processing (Forth Edition) 基本 酉变换 一维的变换: \[\mathbf{t} = \mathbf{A} \mathbf{f}, \\ \mathbf{f} = \mathbf{A}^{H} \mathbf{t}, \\ \mathbf{A}^H = {\mathbf{A}^*}^{T}, \mathbf{A}^H\mathbf{A} = \mathbf{I}. \...
cycles;the input and output datatype is 16-bit single precision fixed-point number.The power dissipation is only 143mW under voltage of 0.9 V.The simulation shows that the design can meet with the efficiency,precision and power dissipation requirements in low power digital image processing system...
DFT (aka Digital Film Tools) is the definitive digital toolbox meant to simulate optical camera filters, specialized lenses, film stocks and grain, lens flares, optical lab processes, color correction, keying, and compositing as well as natural light and photographic effects. ...
Then, the modified subbands are combined in the subband domain. Finally, the fused image is obtained by the inverse transform.Murat SezginIsin ErerOkan K. ErsoySociety of Photo-Optical Instrumentation Engineers Conference on Applications of Digital Image Processing...
Application of Compensation Matrix in the Monobit Digital Receiver Compared with the traditional DFT receiver,the monobit digital receiver can achieve large wideband and high processing speed by adopting low bit A/D and si... H Yang - 《Electronic Science & Technology》 被引量: 0发表: 2012年...
Prentice Hall. R. Gonzalez and R. Woods, "Digital Image Processing," 2nd Edition, Prentice-Hall, 2002. J. O. Smith III, "Introduction to Digital Filters," Online Book, 1997. Oppenheim, A. V., & Schafer, R. W. (2010). Discrete-time signal processing. Pearson education India....
Abstract:Inimagewatermarking,thewatermarkSvulnerabilitytogeometricattackshaslongbeenadifficultproblem.Inthis paper,aDiscreteFourierTransform (DFT)domainrobustdigitalwatermarkingalgorithmbasedonimagenormalizationis proposed.Firstly,thegeometricallyinvariantspaceisconstructedbyusingimagenormalization,andasignificantregionisob— ...