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Proceedings ArticleDOI

Visual masking and the design of magnetic resonance image acquisition

H.H. Garnaoui, +1 more
- Vol. 1, pp 625-628
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TLDR
Novel data acquisition schemes for improving the quality of magnetic resonance images (MRI) by taking into account the characteristics of the human visual system and the location in k-space of the data samples are presented.
Abstract
This paper presents novel data acquisition schemes for improving the quality of magnetic resonance images (MRI) These approaches determine the number of times that k-space (frequency domain) samples have to be acquired and averaged to form an MRI image, by taking into account the characteristics of the human visual system and the location in k-space of the data samples They lead to dramatic reductions in imaging time (by a factor of 8 to 10) with no reduction in image quality Alternatively, they produce higher quality imagery using the same amount of imaging time as conventional approaches

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Citations
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Patent

Real-time face tracking in a digital image acquisition device

TL;DR: In this paper, fixed size face detection is applied to at least a portion of the integral image to provide a set of candidate face regions, and the resolution is adjusted for sub-sampling a subsequent acquired image.
Patent

Digital Image Processing Using Face Detection Information

TL;DR: In this article, a group of pixels are identified that correspond to an image of a face within the digital image and values are adjusted of the one or more parameters within the digitally-detected image based upon an analysis of the digital images including the image of the face and the default values.
Patent

Digital image processing using face detection and skin tone information

TL;DR: In this paper, a skin tone is detected for the face image by determining one or more default color or tonal values, or combinations thereof, for the group of pixels, which are then adjusted for the selected pixels based on the detected skin tone.
Patent

Digital image enhancement with reference images

TL;DR: In this paper, a digital image processing technique detects and corrects visual imperfections using a reference image, where the device corrects the defect based on the information, image data and/or meta data to create an enhanced version of the main image.
Patent

Digital Image Adjustable Compression and Resolution Using Face Detection Information

TL;DR: In this paper, a method of adjustable spatial and/or temporal compression of an image including a face includes identifying a group of pixels that correspond to a face within a digitally-acquired image.
References
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TL;DR: The experiments demonstrate that a grating is masked only by noise whose spatial frequencies are similar to the grating frequency, and provide further indication of the existence of channels in the visual system that are selectively tuned to different spatial frequencies.
Journal ArticleDOI

Adaptive cosine transform coding of images in perceptual domain

TL;DR: An adaptive cosine transform coding scheme for color images which incorporates human visual properties into the coding scheme is described and results show that the subjective quality of the reconstructed images at a bit rate of 0.4 bit/pixel or a compression ratio of 60:1 is very good.
Journal ArticleDOI

Signal-to-noise efficiency in magnetic resonance imaging

TL;DR: It is shown that efficiency is always improved when imaging with the lowest possible resolution (largest voxel dimensions) consistent with viewing the desired anatomical detail and that spatial averaging is an inefficient method of noise reduction in MRI.