Smoothness-Constrained Image Recovery from Block-Based Random Projections

10/08/2013
by   Giulio Coluccia, et al.
0

In this paper we address the problem of visual quality of images reconstructed from block-wise random projections. Independent reconstruction of the blocks can severely affect visual quality, by displaying artifacts along block borders. We propose a method to enforce smoothness across block borders by modifying the sensing and reconstruction process so as to employ partially overlapping blocks. The proposed algorithm accomplishes this by computing a fast preview from the blocks, whose purpose is twofold. On one hand, it allows to enforce a set of constraints to drive the reconstruction algorithm towards a smooth solution, imposing the similarity of block borders. On the other hand, the preview is used as a predictor of the entire block, allowing to recover the prediction error, only. The quality improvement over the result of independent reconstruction can be easily assessed both visually and in terms of PSNR and SSIM index.

READ FULL TEXT

page 2

page 3

page 4

page 6

research
03/05/2021

Interpolation of CT Projections by Exploiting Their Self-Similarity and Smoothness

As the medical usage of computed tomography (CT) continues to grow, the ...
research
08/14/2018

Deep Learning Framework for Digital Breast Tomosynthesis Reconstruction

Digital breast tomosynthesis is rapidly replacing digital mammography as...
research
01/19/2017

Block-wise Lensless Compressive Camera

The existing lensless compressive camera (L^2C^2) Huang13ICIP suffers fr...
research
08/28/2019

Multi-Channel Deep Networks for Block-Based Image Compressive Sensing

Incorporating deep neural networks in image compressive sensing (CS) rec...
research
01/25/2022

Image Fragile Watermarking Algorithm Based on Deneighborhood Mapping

To address the security risk caused by fixed offset mapping and the limi...
research
04/08/2018

Semi-fragile Tamper Detection and Recovery based on Region Categorization and Two-Sided Circular Block Dependency

This paper presents a new semi-fragile algorithm for image tamper detect...
research
06/02/2023

Compatibility and Timing Attacks for JPEG Steganalysis

This paper introduces a novel compatibility attack to detect a steganogr...

Please sign up or login with your details

Forgot password? Click here to reset