Insert scale bar imagej6/16/2023 ![]() Presumably you have the same sample rate in each directin. To go from 1D spatial FFT to 2D spatial FFT, just need a sampling rate in each direction. So an output scale bar of M pixels has a width of M*Fx/N in units of 1/meters. ![]() So each pixel has width Fx/N (agains units 1/meter). The output is N pixels, distributed between 0 and Fx (or between -Fx/2 to Fx/2) (units of 1 / meter). The input is N pixels, and a rate of Fx pixels per meter, for a total width of N/Fx meters. In a 1D spatial FFT, all we do is replace seconds by meters and samples by pixels. The user must specify two arguments, the input file and the output file, as one quote-enclosed argument (see example below). Previous message: ImageJ-bugs Bug 1189 New: Scale bar doesnt show up when saved as Tiff file. Below is a ImageJ macro that will read a user-provided image file, add a scale bar, and then output a PNG image. bugzilla at fiji.sc bugzilla at fiji.sc Sun Nov 15 13:43. So each output sample has width Fs/N (again units 1/second). ImageJ-bugs Bug 1189 Scale bar doesnt show up when saved as Tiff file. The output is N samples, distributed between 0 and Fs (or between -Fs/2 and +Fs/2 depending on your point of view) (units 1/second). With DICOM images, ImageJ sets the initial display range based on the Window Center (0028, 1050) and Window Width (0028, 1051) tags. In a 1D temporal FFT, the input is N samples, at a rate of Fs samples/second, for a total time of N/Fs seconds. Before you can add a scale bar or analyse images, the images have to be calibrated to the correct measurement units. If you are having trouble visualizing the reciprocal space, perhaps an analogy to 1D temporal FFTs will help (personally I'm more familar with these, so an analogy helps me anyway) Include Images Images give everyone a chance to understand the problem.
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