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Subject: Re: Median of an array - msg#00227List: java.imagejlikely to be in the imageJ library. However, you can almost certainly find open source sorting code you could borrow :) If you're dealing with a reasonably small array, I'd use selection sort or insertion sort (google will give you lots of info on either) because they are both simple and easy to understand. If you have to sort arrays frequently or the arrays are pretty large (in the hundreds of items or more), it might be worth looking up a faster algorithm. Quick sort is the best, in general, and doesn't require much code, but the algorithm is a nightmare to understand at first. It's also massively recursive. Hope this helps! david -----Original Message----- From: ImageJ Interest Group [mailto:IMAGEJ@xxxxxxxxxxxx] On Behalf Of Pedro Ramos Sent: Wednesday, July 27, 2005 3:26 AM To: IMAGEJ@xxxxxxxxxxxx Subject: Re: Median of an array Ok, that is the way to calculate the median of an array, I know that. I was wondering if there is a command to do it automatically without programming the whole process you have described. But thanks anyhow for your help. That's how I'll proceed if I can't find a "shortcut". Pedro Thread at a glance:
Previous Message by Date: click to view message previewRe: Helphi, Le 27 juil. 05, à 23:04, Pedro Alejandro Herve Fernandez Carrera Licenciatura en Cs.Biologicas a écrit : Hi, my problem is either to simple or to dificult, i´m working on isopod behaviour and i´m recording the movement, i´ve managed to convert my avi files in to a series of pictures (jpg), but i can´t make the mesurements, the video that the program makes is to fast and i can´t measure the distance that the isopod moves. if someone knows how to slow down the series of pictures, or even better if someone knows how can i make the analisis automaticly I'm doint this with fish larvae: record a video, slow it down = extract a frame every second, record the mouvement. Video part: I do this with mplayer/mencoder, an open source utility found on all platforms a typical command line would be mencoder source_video.??? -nosound -ovc lavc -ofps 1 -o destination_video.avi the ofps parameters sets the numer of frames per second of the destination video (here: one frame per second) then I export the images to pgm files (because they load very quickly in imageJ) but you can export them to JPG if you prefer. mplayer -vo pnm:pgm destination_video.avi I do all this in a bash script that runs on linux or mac os X platforms. Tracking part: Depending on your source material this can be automatic. if your images are completely still except for the isopods, if you have few isopods (one is even better ;-) ), and if the luminosity and contrast of all the video are identic, you can make this automatic. Check the Mtrack2 plugin on the web. There was a demo and a how to somewhere with a video of some small insects in a Petri box. If you cannot meet the requierements, you have to track tehm manually and you can do this with the manual tracking plugin. hope that helps. JiHO --- Windows, c'est un peu comme le beaujolais nouveau : a chaque nouvelle cuvee on sait que ce sera degueulasse, mais on en prend quand meme par masochisme. --- http://jo.irisson.free.fr/ Next Message by Date: click to view message previewNeed help with analyizing imagesHi, I am new to using any image analysis and have been posed with a problem. you can access a bunch of folders by click the following link ftp://129.186.105.169 when it prompts for the user id and password, use mstremler for both. you will see a few folders and if you open say Re0.8, you will see some images which are numbered sequentially. from one image to the other, you will see a increase in the purple color. It is very obvious from the figure to see that, but I am having problem quantifying it by doing some image analysis. Any help regarding this would be very appreciated. I have so far played with just measuring mean intensities and that doesn't seem to solve my problem. Thanks, Vishwa Previous Message by Thread: click to view message previewBrightness/Contrast variationHello everybody, Does anyone know where can I find the source code corresponding to the "Brightness/Contrast variation" function used in the ImageJ ?? Chears, Blandine Next Message by Thread: click to view message previewNeed help with analyizing imagesHi, I am new to using any image analysis and have been posed with a problem. you can access a bunch of folders by click the following link ftp://129.186.105.169 when it prompts for the user id and password, use mstremler for both. you will see a few folders and if you open say Re0.8, you will see some images which are numbered sequentially. from one image to the other, you will see a increase in the purple color. It is very obvious from the figure to see that, but I am having problem quantifying it by doing some image analysis. Any help regarding this would be very appreciated. I have so far played with just measuring mean intensities and that doesn't seem to solve my problem. Thanks, Vishwa Loading Comments...
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