A Real-Time Implementation of Gradient Domain High Dynamic Range Compression Using a Local Poisson Solver

A Real-Time Implementation of Gradient Domain High Dynamic Range Compression Using a Local Poisson Solver

Bibliographic Details
Main Author: Vytla, Lavanya
Language:English
Published: University of Akron / OhioLINK 2010
Subjects:
Electrical Engineering
Engineering
gradient domain compression
high dynamic range
tone mapping
real time
local Poisson solver
Online Access:http://rave.ohiolink.edu/etdc/view?acc_num=akron1270592476
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spelling ndltd-OhioLink-oai-etd.ohiolink.edu-akron12705924762021-08-03T05:26:14Z A Real-Time Implementation of Gradient Domain High Dynamic Range Compression Using a Local Poisson Solver Vytla, Lavanya Electrical Engineering Engineering gradient domain compression high dynamic range tone mapping real time local Poisson solver <p>This thesis presents a real-time hardware implementation of a gradient domain high dynamic range compression algorithm; this technique is useful for processing high dynamic range (HDR) images to be able to view them on standard display devices. The hardware implementation is described in VHDL and synthesized for a field programmable gate array (FPGA) device. The maximum operating frequency achieved is fast enough to process high dynamic range videos with one megapixel per frame at a rate of about 100 frames per second. The hardware is tested on standard HDR images from the Debevec library. The output images have good visual quality and are similar to the output images obtained using floating-point arithmetic. An alternate hardware implementation that does not involve any multipliers is also discussed.</p><p>The inverse gradient transformation required for reconstructing back the image from the manipulated gradients is implemented by means of a local Poisson solver that utilizes only local information around each pixel along with special boundary conditions. The local Poisson solver requires a small and fixed amount of hardware and memory for any image size. The quality of the images obtained using our local Poisson solver for both fixed-point and floating-point implementations is compared to the quality of images produced by a system that solves the Poisson equation using a full-image fast Fourier transform (FFT).</p> 2010-05-20 English text University of Akron / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=akron1270592476 http://rave.ohiolink.edu/etdc/view?acc_num=akron1270592476 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
collection NDLTD
language English
sources NDLTD
topic Electrical Engineering
Engineering
gradient domain compression
high dynamic range
tone mapping
real time
local Poisson solver
spellingShingle Electrical Engineering
Engineering
gradient domain compression
high dynamic range
tone mapping
real time
local Poisson solver
Vytla, Lavanya
A Real-Time Implementation of Gradient Domain High Dynamic Range Compression Using a Local Poisson Solver
author Vytla, Lavanya
author_facet Vytla, Lavanya
author_sort Vytla, Lavanya
title A Real-Time Implementation of Gradient Domain High Dynamic Range Compression Using a Local Poisson Solver
title_short A Real-Time Implementation of Gradient Domain High Dynamic Range Compression Using a Local Poisson Solver
title_full A Real-Time Implementation of Gradient Domain High Dynamic Range Compression Using a Local Poisson Solver
title_fullStr A Real-Time Implementation of Gradient Domain High Dynamic Range Compression Using a Local Poisson Solver
title_full_unstemmed A Real-Time Implementation of Gradient Domain High Dynamic Range Compression Using a Local Poisson Solver
title_sort real-time implementation of gradient domain high dynamic range compression using a local poisson solver
publisher University of Akron / OhioLINK
publishDate 2010
url http://rave.ohiolink.edu/etdc/view?acc_num=akron1270592476
work_keys_str_mv AT vytlalavanya arealtimeimplementationofgradientdomainhighdynamicrangecompressionusingalocalpoissonsolver
AT vytlalavanya realtimeimplementationofgradientdomainhighdynamicrangecompressionusingalocalpoissonsolver
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