Digital Image

Table of contents of Digital Image


In image processing softwares like ImageJ, what's a digital image? how the grays, colors are encoded? how these data are stored in a file?

Binary images

Binary images (black and white) are everywhere in ImageJ, they are required in Analyze > Analyze Particles, have their own operators and functions.
This post explains what they are and how to use them...

Mathematical morphology

Mathematical morphology (MM) [Wikipedia] is a great toolbox for image processing. In ImageJ, most of these operations are available for binary images and are often used to prepare an image before analysis. Moreover, the same operations can be used for gray-level images offering new functionalities in terms of filtering, segmentation,etc.

Black and White, TRUE or FALSE?

When playing with binary images in ImageJ, that's not really simple to remember if TRUE corresponds to white or black (specially, if you use a lot of different binary functions). Here are simple examples to try to understand how it works.

Boolean operators

One of the basic functions for binary images (containing TRUE and FALSE pixels) are the boolean operators useful to manipulate this kind of images.