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…
METHOD FOR PERFORMING IDCT IN DIGITAL IMAGE PROCESSING SYSTEM AND IDCT PROCESSOR THEREFORPURPOSE: To provide a method and a device for executing the inverse discrete cosine transformation of (n)×(n) at a higher speed. CONSTITUTION: A controller 17 controls the calculation of an output vector ...
All variants of the DCT are unitary (or, equivalently, orthogonal): To find their inverses, switch k and n in each definition. DCT-1 and DCT-4 are their own inverses. DCT-2 and DCT-3 are inverses of each other. References [1] Jain, A. K. Fundamentals of Digital Image Processing. ...
Copy-move image forgery detection library. golangcomputer-visionimage-processingdigital-signal-processingimage-forensicsdctforgery-detection UpdatedMar 8, 2022 Go Yuxfei/Digital-Image-Watermark Star125 Serveral digital image watermark algorithms implement with C++/OpenCV ...
Recovering unknown, missing, damaged, distorted, or lost information in DCT coefficients is a common task in multiple applications of digital image processing , including image compression , selective image encryption , and image communication. This paper investigates the recovery of sign bits in DCT ...
Mostly, some traces of digital tamper may be left in the image during the manipulation, which result in the inconsistency of the natural images and provide some clues for image forgeries. This paper proposes a novel double compression probability model to describe the change of DCT coefficients af...
Nowadays volumes of image and video data are stored and transferred in the form of compressed data structure. The Discrete Cosine Transform(DCT) is one of the most widely used digital compression techniques for multimedia. Data processing such as video editing or feature extraction directly in the...
In this paper, a spreadspectrum- like discrete cosine transform (DCT) domain watermarking technique for copyright protection of still digital images is analyzed. In our approach, the watermark is embedded in the mid frequency band of the DCT blocks only in the sub band which is carrying low ...
References [1] Jain, A. K., Fundamentals of Digital Image Processing, Englewood Cliffs, NJ, Prentice Hall, 1989, pp. 150-153. [2] Pennebaker, W. B., and J. L. Mitchell, JPEG: Still Image Data Compression Standard, New York, Van Nostrand Reinhold, 1993....
\Users\dzoni\Documents\GitHub\watermark\output\marked\Marked_image_DWT.tif Correlation Coefficient of the watermarks 1.000000 Normalized Correlation of the watermarks 1.000000 Correlation Coefficient of the images 0.998351 Normalized Correlation of the images 1.000107 Num of bit errors in de...