allPreprocess: Perform all pre-processing steps

In xhtai/cartridges: Algorithm to Compare Cartridge Case Images

Description

Images must be of the standard format as provided in the NIST Ballistics and Research Toolmark Database. The dimensions are 1944 x 2592 pixels, and images are on a 255-grayscale. Here we use ring light images. This function performs all the pre-processing steps, consisting of

• Automatically selecting the breechface marks

• Leveling the image

• Removing circular symmetry

• Removing outliers and filtering.

Usage

allPreprocess(fileName)

Arguments

fileName

location of image file. This function has been tested on png files.

Value

An image matrix, cropped to the smallest rectangle containing the valid breechface area. Non-breechface pixels are set to 0. After all pre-processing, possible pixel values are -510 to 510.

Examples

## Not run: 
processedExample <- allPreprocess(system.file("extdata", "NBIDE R BF 118.png", package = "cartridges"))

## End(Not run)

xhtai/cartridges documentation built on June 1, 2019, 2:58 p.m.