Implementation of an active perceptual scheme for …

AB - In the past decade, watermarking has become an important tool in copyright protection applications. In this paper, we introduce a new watermarking scheme in the joint time-frequency domain. Wigner distribution is used to transform an image into the spatial-spectral domain. The proposed method selects the time-frequency cells to be watermarked based on the particular image's energy distribution in the joint domain. This approach ensures the imperceptibility of the embedded watermark. It is shown that embedding in the time-frequency domain is equivalent to a nonlinear embedding function in the spatial domain. A corresponding watermark detection algorithm is also introduced. The performance of the proposed watermarking algorithm under possible attacks, such as noise, re-sampling, rotation, filtering, and JPEG compression is illustrated.

Because I like drawing, here is a simple block diagram of the perceptual coding scheme: ..

An auralization scheme is introduced, which allows accurate positioning of sound sources within a synthesized auditory environment using standard multichannel loudspeaker formats. The new software toolset comprises modules generating defined discrete reflections and the formerly introduced VSP pan pot. Both can be configured in each channel of the desk. An arbitrary number of spatialized sound sources can be combined to form an acoustical scene by additionally applying a reverberation module that generates transition and late parts of typical room impulse responses, adjustable by perceptual : parameters.:


A Novel Perceptual Image Encryption Scheme Using ..

the proposed SCI perceptual quality assessment scheme, ..

N2 - In the past decade, watermarking has become an important tool in copyright protection applications. In this paper, we introduce a new watermarking scheme in the joint time-frequency domain. Wigner distribution is used to transform an image into the spatial-spectral domain. The proposed method selects the time-frequency cells to be watermarked based on the particular image's energy distribution in the joint domain. This approach ensures the imperceptibility of the embedded watermark. It is shown that embedding in the time-frequency domain is equivalent to a nonlinear embedding function in the spatial domain. A corresponding watermark detection algorithm is also introduced. The performance of the proposed watermarking algorithm under possible attacks, such as noise, re-sampling, rotation, filtering, and JPEG compression is illustrated.


A color space is a specific organization of colors

N2 - We present a new technique for coding gray-scale images for facsimile transmission and printing on a laser printer. We use a gray-scale image encoder so that it is only at the receiver that the image is converted to a binary pattern and printed. The conventional approach is to transmit the image in halftoned form, using entropy coding (e.g., CCITT Group 3 or JBIG). The main advantages of the new approach are that we can get higher compression rates and that the receiver can tune the halftoning process to the particular printer. We use a perceptually based subband coding approach. It uses a perceptual masking model that was empirically derived for printed images using a specific printer and halftoning technique. In particular, we used a 300 dots/inch write-black laser printer and a standard halftoning scheme (“classical”) for that resolution. For nearly transparent coding of gray-scale images, the proposed technique requires lower rates than the standard facsimile techniques.

Mathematical and Natural Sciences

In the past decade, watermarking has become an important tool in copyright protection applications. In this paper, we introduce a new watermarking scheme in the joint time-frequency domain. Wigner distribution is used to transform an image into the spatial-spectral domain. The proposed method selects the time-frequency cells to be watermarked based on the particular image's energy distribution in the joint domain. This approach ensures the imperceptibility of the embedded watermark. It is shown that embedding in the time-frequency domain is equivalent to a nonlinear embedding function in the spatial domain. A corresponding watermark detection algorithm is also introduced. The performance of the proposed watermarking algorithm under possible attacks, such as noise, re-sampling, rotation, filtering, and JPEG compression is illustrated.