https://davidhampgonsalves.com/tags/opencv/Recent content in OpenCV on David Hamp-GonsalvesHugo -- gohugo.ioen-USSun, 02 Aug 2015 00:00:00 +0000https://davidhampgonsalves.com/failed-projects-open-mosaic/Sun, 02 Aug 2015 00:00:00 +0000https://davidhampgonsalves.com/failed-projects-open-mosaic/The goal of this project was to recreate an image as a mosaic of other images. I wanted to achieve this with a low number of tiles and not simply use images as pixels based on their colors. Mistakes The biggest mistake I made was to vastly underestimate the difficulty of the problem. I thought I could get good results by tuning my early histogram grid implementation and floundered. I have seen many other attempts at this project but yet to see any that produce good results.https://davidhampgonsalves.com/opencv-comparehist-performance/Sat, 31 Jan 2015 00:00:00 +0000https://davidhampgonsalves.com/opencv-comparehist-performance/I did some performance tests on the four histograms comparison methods that [compareHist](http://docs.opencv.org/java/org/opencv/imgproc/Imgproc.html#compareHist(org.opencv.core.Mat, org.opencv.core.Mat, int)) provides and initially found that in basic performance tests they were all about the same speed. More recently I profiled them in a real world application and found they were significantly different. This is all using the Java OpenCV bindings.https://davidhampgonsalves.com/opencv/python-color-tracking/Mon, 30 May 2011 00:00:00 +0000https://davidhampgonsalves.com/opencv/python-color-tracking/Preamble I needed some color based object tracking for a project I was hacking together last weekend. I choose to use the OpenCV Python bindings since I knew that I wouldn’t be doing anything fancy and I thought it would simplify the learning process. While the Python bindings are great I wasn’t able to find much documentation and what I thought would be an easy 10 minutes turned into a bit of an afternoon project.