iRfcb (version 0.5.1)

ifcb_extract_pngs: Extract Images from IFCB ROI File

Description

This function reads an IFCB (.roi) file and its corresponding .adc file, extracts regions of interest (ROIs), and saves each ROI as a PNG image in a specified directory. Optionally, you can specify ROI numbers to extract, useful for specific ROIs from manual or automatic classification results. Additionally, a scale bar can be added to the extracted images based on a specified micron-to-pixel conversion factor.

Usage

ifcb_extract_pngs(
  roi_file,
  out_folder = dirname(roi_file),
  ROInumbers = NULL,
  taxaname = NULL,
  gamma = 1,
  overwrite = FALSE,
  scale_bar_um = NULL,
  scale_micron_factor = 1/3.4,
  scale_bar_position = "bottomright",
  scale_bar_color = "black",
  old_adc = FALSE,
  verbose = TRUE
)

Value

This function is called for its side effects: it writes PNG images to a directory.

Arguments

roi_file

A character string specifying the path to the .roi file.

out_folder

A character string specifying the directory where the PNG images will be saved. Defaults to the directory of the ROI file.

ROInumbers

An optional numeric vector specifying the ROI numbers to extract. If NULL, all ROIs with valid dimensions are extracted.

taxaname

An optional character string specifying the taxa name for organizing images into subdirectories. Defaults to NULL.

gamma

A numeric value for gamma correction applied to the image. Default is 1 (no correction). Values <1 increase contrast in dark regions, while values >1 decrease contrast.

overwrite

A logical value indicating whether to overwrite existing PNG files. Default is FALSE.

scale_bar_um

An optional numeric value specifying the length of the scale bar in micrometers. If NULL, no scale bar is added.

scale_micron_factor

A numeric value defining the conversion factor from micrometers to pixels. Defaults to 1/3.4.

scale_bar_position

A character string specifying the position of the scale bar in the image. Options are "topright", "topleft", "bottomright", or "bottomleft". Defaults to "bottomright".

scale_bar_color

A character string specifying the scale bar color. Options are "black" or "white". Defaults to "black".

old_adc

A logical value indicating whether the adc file is of the old format (samples from IFCB1-6, labeled "IFCBxxx_YYYY_DDD_HHMMSS"). Default is FALSE.

verbose

A logical value indicating whether to print progress messages. Default is TRUE.

See Also

ifcb_extract_classified_images for extracting ROIs from automatic classification.

ifcb_extract_annotated_images for extracting ROIs from manual annotation.

Examples

if (FALSE) {
# Convert ROI file to PNG images
ifcb_extract_pngs("path/to/your_roi_file.roi")

# Extract specific ROI numbers from ROI file
ifcb_extract_pngs("path/to/your_roi_file.roi", "output_directory", ROInumbers = c(1, 2, 3))

# Extract images with a 5 micrometer scale bar
ifcb_extract_pngs("path/to/your_roi_file.roi", scale_bar_um = 5)
}