1. BAD SECTOR PHOTOLAB Presents
Good afternoon. I am Serra Sinem Tekiroğlu. Today I and my friend Serap Atılgan will present you the Photolab Project of Bad Sector.
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2. BAD SECTOR Project Title: PHOTOLAB Project Topic: Photogrammetry Lab
Team Members:
Serap ATILGAN
Meryem AYAS
Serra S. TEKİROĞLU
Hanife ÜNAL
Assistant: Murat YÜKSELEN
Sponsor Company:
Before starting, I want to introduce Bad Sector. Our team members are Serap Atılgan, Hanife Ünal, Meryem Ayas, and me Serra Sinem Tekiroğlu. We carry on Photolab Project in collaboration with Milsoft. Our assistant Murat Yükselen helps us in this hard process.
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3. OUTLINE Photogrammetry PHOTOLAB Modules & Features Demo & Questions
GUI
Project Manager
Demo & Questions
Now it is time to start to give brief information about Photolab Project. Since we are the first group to represent Photolab I will describe you the contents of the Photogrammetry process. Then I will explain current solutions , the features of Photolab Project and at last why photolab will be preferred in the market.
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4. What is Photogrammetry?
Firstly I want to talk about photogrammetry. Photogrammetry is to get reliable information about physical objects of photographic images. For instance , photogrammetry is used while we need to convert 2 dimensional image into a 3 dimensional one. Therefore we can find the correct location and elevation of a point in earth using photogrammetry in multiple images taken from different positions. When we narrow down the scope of photogrammetry to our Project, we face with the images collected by unmanned air vehicles(UAVs). These images can be used for many areas such as military, civil or Geographic Information System(GIS) applications. However in order to make use of these images in these areas, we need to process images to get meaningful outputs. After processing we will have four different output types. First one is mosaic. In mosaic Photolab merges small related images into a bigger one. Second output is Digital Elevation Model (DEM). Dem is simply a digital representation of a surface. Third one is Orthophoto. It is a geometrically corrected image. And last output is Super Resolution which means to get higher resolution images from low resolutions one. My friend Serap Atılgan will talk about these outputs in detail at Photolab Features part.

5. Sub Modules of Photogrammetry
Mosaic Sub Module
Orthophoto Sub Module
DEM (Digital Elevation Model) Sub Module
Firstly I want to talk about photogrammetry. Photogrammetry is to get reliable information about physical objects of photographic images. For instance , photogrammetry is used while we need to convert 2 dimensional image into a 3 dimensional one. Therefore we can find the correct location and elevation of a point in earth using photogrammetry in multiple images taken from different positions. When we narrow down the scope of photogrammetry to our Project, we face with the images collected by unmanned air vehicles(UAVs). These images can be used for many areas such as military, civil or Geographic Information System(GIS) applications. However in order to make use of these images in these areas, we need to process images to get meaningful outputs. After processing we will have four different output types. First one is mosaic. In mosaic Photolab merges small related images into a bigger one. Second output is Digital Elevation Model (DEM). Dem is simply a digital representation of a surface. Third one is Orthophoto. It is a geometrically corrected image. And last output is Super Resolution which means to get higher resolution images from low resolutions one. My friend Serap Atılgan will talk about these outputs in detail at Photolab Features part.
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6. Automatic Mosaic Manual Mosaic World File Mosaic
MOSAIC Sub Module
Automatic Mosaic
Manual Mosaic
World File Mosaic
According to this features we designed photolab in modular architecture. There are 3 modules.
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7. Automatic Mosaic Algorithm
Find Corners by NCC
Detect Matching Corners
Eliminate Outliers (RANSAC)
Get Best Homography Matrix
Interpolate Image
First module is GUI. GUI provides user manual and automatic modes. It also supports multiple image handling and visual layout options. In addition GUI has image enhancement and preproccessing menus.
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8. Manual Mosaic Algorithm
Select Points Manually
Get Best Homography Matrix
Register Image
Interpolate Image
First module is GUI. GUI provides user manual and automatic modes. It also supports multiple image handling and visual layout options. In addition GUI has image enhancement and preproccessing menus.
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9. World File Mosaic Algorithm
Read World Coordinates
Get Homography Matrix
Interpolate Image
First module is GUI. GUI provides user manual and automatic modes. It also supports multiple image handling and visual layout options. In addition GUI has image enhancement and preproccessing menus.
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10. ORTHOPHOTO
Sub Module
. You can see in this slide, multiple images can be shown in cascading Windows or in a common grid.
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11. ORTHOPHOTO Algorithm Construct a Rotation Matrix Scaling
Geographical Registration
Construct a Rotation Matrix
(Omega-Phi-Kappa)
Scaling
Transformation
You can see an image before and after enhancements. Since photogrammetry works on different and multiple images, Photolab may need enhancement on images according to the current properties of images. For instance, if two images have been taken in different hours of the day, we may need to arrange the brightness of the images.
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12. DEM Sub Module
Second module of Photolab is file system module. This module is responsible of handling basic file operations and also it provides working on various image types by converting them into Bitmap. In addition Photolab uses video formats as input. It extracts images from video stream and prepare them to be processed. Photolab also supports worldfile format. Worldfile is data file used by geographic information systems to contain world coordinate information of the image. Photolab assumes worldfile as an attachement to the image.
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13. Epipolar Rectification Block Bounded Adjustment
DEM Algorithm
Epipolar Rectification
Block Bounded Adjustment
The last and the most important module of Photolab is Photogrammetry Module. It is basically formed of four submodules, namely DEM, Orthophoto, Mosaic and Super Resolution. Lets see the submodules more detailed step by step.
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14. PROJECT PROGRESS Photogrammetry Module GUI Module :
Mosaic SubModule : %90
Orthophoto SubModule : %80
DEM SubModule : %0
GUI Module :
Image Enhancement : %95
Basic Toolbar : %90
Project Manager Module :%100
The first submodule is Digital Elevation Model. DEM simply brings depth as third dimension to a 2 dimensional aerial image. Photolab takes one or more images as input and estimates the height of each point in these images. As an output we obtain exact location of the whole image in earth surface. Since multiple images mean more overlapped points we can get more correct results by applying DEM on more than one image.
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15. DEMO
Thanks for your attention. Now we can answer, if you have any questions.
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16. Thanks For Your Attention
Questions?
Thanks for your attention. Now we can answer, if you have any questions.
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