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orfeo-toolbox.org

First use with the Orfeo Toolbox framework Monteverdi

First use with the Orfeo Toolbox framework Monteverdi

Stéphane MAY

stephane.may@cnes.fr

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orfeo-toolbox.org

Menu File > Open

Im4_C_29042009_170_395/372076101/SPVIEW01/IMAGERY.TIF

Menu Visualization > Viewer

Select your input images

Discover the viewer functionalities

Alternative : right click on the module in the pipeline

Use case 1 : open an image, and discover the viewer Use case 1 : open an image, and discover the viewer

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Visualization

Viewer (1/5)

Monteverdi – ViewerMonteverdi – Viewer

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orfeo-toolbox.org

Visualization

Viewer (2/5)

Monteverdi - ViewerMonteverdi - Viewer

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Visualization

Viewer (3/5)

Monteverdi - ViewerMonteverdi - Viewer

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orfeo-toolbox.org

Visualization

Viewer (4/5)

Monteverdi - ViewerMonteverdi - Viewer

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Visualization

Viewer (5/5)

Monteverdi - ViewerMonteverdi - Viewer

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orfeo-toolbox.org

Menu File > Open

Im4_C_29042009_170_395/372076101/SPVIEW01/IMAGERY.TIF

Menu Visualization > Viewer (lock the pipeline !)

File > Extract ROI from dataset

Positions (x,y) = [3000,3000], sizeX=500 (w), sizeY=600 (h)

File > Save dataset

File > Save dataset (advanced)

Save only Channel 1 in Float type

Seel also :

Right click on pipeline module ExtractROI > Show module

Cache dataset

Use case 2 : create a pipeline, save an image Use case 2 : create a pipeline, save an image

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File > Extract ROI

Monteverdi - ROIMonteverdi - ROI

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File > Save dataset (advanced)

Choice of data type

Choice of output channels

Monteverdi – Save datasetMonteverdi – Save dataset

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orfeo-toolbox.org

Menu File > Open

./theme2/extraitIm2_C/Im2_c_extrait.tif

Menu Filtering > Threshold

Generic Threshold / Threshold Above / Change Lower threshold

Generic Threshold / Threshold Below / Change Upper Threshold

➢Role of outside value

➢Role of alpha (alpha blending) : alpha=0

Generic Threshold / Threshold outside / Change upper & lower th.

Binary threshold / Lower & Upper threshold / Outside & Inside

values

Use case 3 : threshold an imageUse case 3 : threshold an image

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Filtering

Threshold

Monteverdi - ThresholdMonteverdi - Threshold

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Filtering

Feature Extraction (1/3)

Monteverdi – Feature extractionMonteverdi – Feature extraction

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Filtering

Feature Extraction (2/3)

Monteverdi – Feature extractionMonteverdi – Feature extraction

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Filtering

Feature Extraction (3/3)

➢More than 65 features !

Mean, variance, Gradient, spectral angleTextures (energy, entropy, contrast, etc)

Morphological filters

Radiometric indexes• Vegetation (NDVI, ARVI, etc), Soil, Built up, Water

Edge density

Mean shiftOriginal data (=> no need to concatenate channels after filtering)

Etc

Monteverdi – Feature extractionMonteverdi – Feature extraction

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orfeo-toolbox.org

Menu File > Open

./theme2/extraitIm2_C/Im2_c_extrait.tif

Menu Filtering > Feature extraction

Test the following features (See OTB-Software-Guide.pdf for technical

details on algorithms)

➢Original data (=> no need to concatenate channels after filtering)

➢Edge detection : Touzi

➢Spectral angle : choose one vegetation pixel

➢Variance

➢Mean

➢Rec. gradient

➢Morphology > Morphology opening

➢Edge density > Sobel

Use case 4 : Feature extraction (1/3)Use case 4 : Feature extraction (1/3)

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orfeo-toolbox.org

Menu Filtering > Feature extraction

Test the following features (See OTB-Software-Guide.pdf for

technical details on algorithms) :

➢Radiometric indexesVegetation

• NDVI, RVI, PVI, etc Soil

• BI2

Built up• ISU

Further work :

➢Rename output image channels

➢Save your result

➢Build Mean, variance image on a Touzi image

Use case 4 : Feature extraction (2/3)Use case 4 : Feature extraction (2/3)

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Solution : mean, variance over Touzi image

Reader

Feature Extraction (Reader0) > Touzi

Feature Extraction (FeatureExtraction1) > Mean, Variance

Save your result

Use case 4 : Feature extraction (3/3)Use case 4 : Feature extraction (3/3)

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Menu File > Open

./theme2/extraitIm2_C/Im2_c_extrait.tif

Menu Filtering > Feature extraction > NDVI

Menu File > Concatenate Image

Add Reader0 → Channel 1

Add Reader0 → Channel 2

Add FeatureExtraction1 → OutputImage

View the result

Use case 5 : concatenate your resultsUse case 5 : concatenate your results

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File > Concatenate images

Monteverdi – Concatenate imagesMonteverdi – Concatenate images

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Command line tool

otbConcatenateImages-cli -il image1.tif image2.tif -out img_concat.tif

OTB – Concatenate imagesOTB – Concatenate images

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Thank you for your attention !

Monteverdi Monteverdi