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| PhotoTechEDU Day 3: Ray Tracing, Lenses, and Mirrors |
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Google Tech Talks
January 31, 2007
ABSTRACT
Photographic Technology Day 3: Ray Tracing,
Lenses, and Mirrors
In this lecture, we will study the principles
of ray tracing for simple optical components:
thin spherical lenses and spherical mirrors.
The notion of real/virtual object and
real/virtual images will be highlighted as
well as the computation of the position and
magnification the image. The case of thick
lenses will also be mentioned including the
notion of nodal and cardinal points.
Credits: Speaker:Rom Clement
Tags : google howto phototechedu day ray tracing |
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Affichage : 2610
Durée : 3451 s |
| PhotoTechEDU Day 25: Open-source-based high-resolution... |
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Google Tech Talks
August 10, 2007
ABSTRACT
Andrey will explain the designs and
applications of Elphel, Inc. intelligent,
network-enabled cameras based on open source
hardware and software. Google currently uses
Elphel cameras for book scanning and for
capturing street imagery in Google Maps.
Andrey hopes Elphel's newest modular cameras,
the Model 353 camera and the Model 363
camera, will attract software engineers and
FPGA hardware engineers interested in
exploring high-definition videography and
other innovative applications. # useful
properties of light and image formation
# theory and techniques of photographic
optics and image capture
# theory of colorimetry and techniques of
color...
Tags : google howto phototechedu day open source |
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Affichage : 1165
Durée : 2612 s |
| PhotoTechEDU Day 6: Digital Camera Image Processing... |
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Google Tech Talks
February 28, 2007
ABSTRACT
Photographic Technology EDU Day 6: In this
session we examine the steps that a digital
camera goes through to take raw data from an
image sensor and make a photograph out of it.
There are more steps than you might imagine,
arranged in what is usually termed a
pipeline, and is sometimes implemented on
pipelined hardware, to get to a pleasing
photographic rendering of the scene.
Credits: Speaker:Richard Lyon
Tags : google howto phototechedu day digital camera |
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Affichage : 2757
Durée : 3476 s |
| PhotoTechEDU Day27: Focus on Resolution |
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Google Tech Talks
August 22, 2007
ABSTRACT
Photo Technology Lecture 27: Focus on
Resolution.
We investigate the digital image acquisition
process for factors that adversely affect the
quality of acquired imagery.
# The physical properties of optical systems
impose a fundamental limit to the resolution
of captured imagery.
# Real-world optics manifest several types of
aberrations, and we show how these types of
aberrations affect resolution.
# Image acquisition devices are imperfect,
and have aliasing and other sampling
artifacts that affect resolution.
# We derive the 70% rule for digital imagery,
and verify it experimentally.
# There is a distinction between resolution
and...
Tags : google howto phototechedu day27 focus |
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Affichage : 672
Durée : 2769 s |
| PhotoTechEDU Day 22: Measuring, Interpreting and... |
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Google Tech Talks
June 20, 2007
ABSTRACT
Every lens has flaws. The eye—arguably the
most important lens—has more than it's
share. This talk is about recent technology
that lets physicians measure and understand
these wavefront aberrations. Some of these
aberrations degrade our vision, while others
seem to enhance it. Finally, I'll talk about
efforts and technology to correct those
aberrations.
# useful properties of light and image
formation
# theory and techniques of photographic
optics and image capture
# theory of colorimetry and techniques of
color reproduction
# where and how photography is being used in
Google products and projects
# what tools exist inside Google for
photographic...
Tags : google howto phototechedu day measuring |
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Affichage : 638
Durée : 3510 s |
| PhotoTechEDU Day 11: Document Image Analysis with Leptonica |
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Google Tech Talks
April 4, 2007
ABSTRACT
Graphics typically takes a representation of
an image or scene and renders it in raster
form. This normally occurs through a
well-specified process. What happens when you
try to go the other way, from a raster image
to a description of its contents? The
process, so easy for humans, is not easy for
machines, because the input raster data can
be highly variable and the interpretation of
the contents somewhat arbitrary. We'll talk
about how this 'inverse graphics' process can
be accomplished quickly and usually with
sufficient accuracy for most applications,
using rasters of document images as input.
The 'trick' is to use the image as the
primary...
Tags : google howto phototechedu day document image |
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Affichage : 592
Durée : 3338 s |
| PhotoTechEDU Day 14: Exposing Digital Forgeries from... |
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Google Tech Talks
April 25, 2007
ABSTRACT
With the advent of high-resolution digital
cameras, powerful personal computers and
sophisticated photo-editing software, the
manipulation of digital images is becoming
more common. To this end, we have been
developing a suite of tools to detect
tampering in digital images. I will discuss
two related techniques for exposing forgeries
from inconsistencies in lighting. In each
case we show how to estimate the direction to
a light source from only a single image:
inconsistencies across the image are then
used as evidence of tampering. Credits:
Speaker:Hany Farid
Tags : google howto phototechedu day exposing |
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Affichage : 854
Durée : 3635 s |
| PhotoTechEDU Day 32 - Art, Science and Reality of High Dynamic Range (HDR) Im... |
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Google Tech Talks
January, 25 2008
ABSTRACT
High Dynamic Range (HDR) image capture and
display has become an
important engineering topic. The discipline
of reproducing scenes with
a high range of luminances has a five-century
history that includes
painting, photography, electronic imaging and
image processing. HDR
images are superior to conventional images.
There are two fundamental
scientific issues that control HDR image
capture and reproduction. The
first is the range of information that can be
measured using different
techniques. The second is the range of image
information that can be
utilized by humans. Optical veiling glare
severely limits the range of
luminance that can be captured and seen.
In recent experiments, we measured camera and
human responses to
calibrated HDR test targets. We calibrated a
4.3-log-unit test target,
with minimal and maximal glare from a
changeable surround. Glare is an
uncontrolled spread of an image-dependent
fraction of scene luminance
in cameras and in the eye. We use this
standard test target to measure
the range of luminances that can be captured
on a camera's image
plane. Further, we measure the appearance of
these test luminance
patches. It is the improved quantization of
digital data and the
preservation of the scene's spatial
information that cause the
improvement in quality in HDR reproductions.
HDR is better than
conventional imaging, despite the fact the
multiple- exposure-HDR
reproduction of luminance is inaccurate. This
talk describes the
history of HDR image processing techniques
including painting,
photography, and electronic image processing
(analog and digital) over
the past 40 years. It reviews the development
of Retinex theory, and
other spatial-image- processing algorithms,
that calculate appearance
in images from arrays of radiances.
Speaker: John McCann
John McCann received a B.A. degree in Biology
from Harvard University
in 1964. He worked in, and later managed,
the Vision Research
Laboratory at Polaroid from 1961 to 1996. He
has studied human color
vision, digital image processing, large
format instant photography and
the reproduction of fine art. He is a Fellow
of IS&T. He is a past
President of IS&T and the Artists Foundation,
Boston. He is currently
consulting and continuing his research on
color vision. He is the
IS&T/OSA 2002 Edwin H. Land Medalist and IS&T
2005 Honorary Member and
will be a 2008 Fellow of the Optical Society
of America.
Tags : google techtalks techtalk engedu talk talks googletechtalks education |
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Affichage : 3491
Durée : 3911 s |
| PhotoTechEDU Day 16: Multi-viewpoint Mosaics |
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Google Tech Talks
May 2, 2007
ABSTRACT
Pictures taken by a rotating camera can be
registered and blended on the sphere into a
smooth panorama. What is left to be done, in
order to obtain a flat panorama, is
projecting the spherical image onto a picture
plane. This step is unfortunately not
obvious: the surface of the sphere may not be
flattened onto a page without some form of
distortion. Distortions are also unavoidable
when mosaicking images taken while the point
of view changes or/and the scene changes
(e.g., due to objects moving). In such cases
no geometrical consistent mosaic may be
obtained. Artists have explored this problem
and demonstrated that the geometrical
consistency is not the...
Tags : google howto phototechedu day multi viewpoint |
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Affichage : 542
Durée : 3262 s |
| Photo Tech EDU Day 1: Photo Technology Overview |
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Google Tech Talk
January 17, 2007
ABSTRACT
The goal of PhotoTechEDU is to have a
Photographic Technology short course for
engineers. The course will teach:
- useful properties of light and image
formation
- theory and techniques of photographic
optics and image capture
- theory of colorimetry and techniques of
color reproduction
- and lots more... Credits: Speaker:Richard
Lyon
Tags : google howto photo tech edu day technology |
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Affichage : 4633
Durée : 3610 s |
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