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Author Archives: joelgranados
Paper: Use of digital webcam images to track spring green-up in a deciduous broadleaf forest
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
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Paper: Point sampling digital imagery with ‘samplepoint’.
This paper describes a computer aided method to calculate coverage. Note that the methodology exposed is not automated, it is a piece of software that helps in “manually” identifying sections (pixels) of an image. These identified pixels are then translated … Continue reading
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Paper: Use of networked digital camera to estimate net CO2 uptake of desiccation-tolerant moss.
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
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.
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
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
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
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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Remove defined variables from R environment
When I am debugging a piece of code I usually do it inside the R-terminal. It’s nice to do things this way because you can poke at things when something goes wrong. The only disadvantage is that you mush “refresh” … Continue reading
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opencv add padding
I was surprised that this function was so difficult to find. I googled with the title of this post and did not find any real solution to what I was looking for. I just want to add some pixels of … Continue reading
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