Category Archives: PhD

Expected non-exciting initial results…

Posted on May 23, 2011 by joelgranados

I ran Principal Component Analysis (PCA) on the hog features that I calculating (Using Navneet Dalal’s code) and the result was not spectacular.  I plotted the result and color coded the types of flowers (bud:red, female:green, unknownSex:blue, hair:cyan, male:magenta).  The … Continue reading →

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Navneet Dalal’s HOG Descriptors

Posted on May 16, 2011 by joelgranados

After fighting a bit with the code, I got it to compile.  The following is a list of the things I did: There were a lot of additional files in the src tree.  These files are automatically created by Autotools. … Continue reading →

Posted in git, PhD | 11 Comments

About HOG transform in opencv2.2

Posted on May 13, 2011 by joelgranados

This post could also be titled: “Why I’ve decided not to use the HOGDescriptors from opencv”.  There are three main reasons why I chose not to use the provided HOG functionality in Opencv: What is in Opencv is not only … Continue reading →

Posted in opencv, PhD | 2 Comments

Paper: Use of digital webcam images to track spring green-up in a deciduous broadleaf forest

Posted on May 11, 2011 by joelgranados

Comments: On thing that caught my eye was the way that they used the color channels.  They calculated an index based on the green spectrum: (2*Green) – (Red+Blue).  In the figures they published it gave a really good measure of … Continue reading →

Posted in papers, PhD | 4 Comments

Paper: Use of networked digital camera to estimate net CO2 uptake of desiccation-tolerant moss.

Posted on May 10, 2011 by joelgranados

Though this paper is directly related to the use of digital camera in plant ecological studies, it is more focused in the correlation between the data from the digital camera and the measurement of photosynthesis.  Since the objective was this … Continue reading →

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Paper: Using digital photographs and object-based image analysis to estimate percent ground cover in vegetation plots

Posted on May 10, 2011 by joelgranados

Genera setup: They used eCognition for image recognition; Kodak DC4800; 2 square meter plots; 1.5 meters above the ground with a 90 degree angle (as opposed to the 45 degree in the digital repeat photography paper); 3.1 megapixels; Used automatic … Continue reading →

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Paper: Monitoring Plant Phenology Using Digital Repeat Photography.

Posted on May 9, 2011 by joelgranados

Additional Measurements: Soil moisture, temperature, air temperature, relative humidity, Solar radiation flux (with a pyranometer), amount of precipitation, from the RGB the calculated “amount of greenness”, percent aerial cover of plants with SamplePoint (Some kind of software, I have to … Continue reading →

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Annotating for HOG Based detecting

Posted on May 6, 2011 by joelgranados

When we did the annotation process for the Zackenberg flower pictures I insisted in annotating the WHOLE flower.  In my mind, the more information we gave the algorithm, the better it would perform.  This means that we have some annotations … Continue reading →

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R: Efficient data loading

Posted on March 26, 2011 by joelgranados

I’m working with the HOG_01 directory from this dataset.  They have organized so that each data point is a 1568 line text file.  The data sets are also separated in 43 types.  Unzip the data and you will see what … Continue reading →

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R filter rows based on an element

Posted on March 21, 2011 by joelgranados

I need to separate a matrix based on the existence of an element in a row.  I will end up with two matrices: the first will not contain the element on any of its rows and the second will contain … Continue reading →

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