^ HDTR of the Vancouver Skyline on 19 July 2007. Images from 5.30pm to 9pm and were blended using the HDTR software. Time flows non-uniformly, left to right. The composite is blended spatially and temporally (zoom) (movie).

HDTR | High Dynamic Time Range Images

capturing the flow of time in a single frame

download

makehdtr-0.1.tgz

MD5SUM 5e14c2a85463c1b1d49a1431367bda1e

code

The code to create the HDTR images on this site is written in Perl. If you're on a UNIX system, chances are Perl is already installed. For Windows, use ActiveState Perl.

You will require the following modules (see CPAN, or use the ActiveState ppm package manager).

Date::Calc
Date::Parse
Getopt::Long
Math::VecStat
Math::Round
Pod::Usage
GD

The script comes with

set of input images
several configuration files
sample HDTR images

installation

tar -xvfz makehdtr-0.1.tgz
cd makehdtr-0.1.tgz
/usr/bin/perl makehdtr -conf image-01.conf
# extra debug information
/usr/bin/perl makehdtr -conf image-01.conf -debug

Depending on the amount of blending, HDTR image creation can take several minutes. For example, on an Opteron 248 system with 1 Gb or RAM, image-01.jpg takes 55 seconds.

image 1

configuration | basic HDTR with no blending.

image 2

configuration Added time stretch.

stretch_time = yes
time_blend_a = 0.75

image 3

configuration Added spatial blending

spatial_blend = yes
blend_dist    = 0.5
blend_a       = 1

image 4

configuration Added temporal blending

weights = 1,2,4,2,1

image 5

configuration Changed time flow direction

flowaxis = y
flowdir  = 1