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Monthly Archives: May 2011
Paper: Histograms of Oriented Gradients for Human Detection.
The approach lists the points that interest me. This is NOT an exhaustive summary of the paper. Approach: First you calculate the gradients. They tested various ways of doing this and concluded that a simple [-1,0,1] filter was best. After this … Continue reading
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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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