threshold_apply: Threshold a video with pre-determined parameters

In vmeasur: Quantify the Contractile Nature of Vessels Monitored under an Operating Microscope

Description

Using pre-determined values this function generates ROI from a video. If parameters are not known, use select_roi() This function is optimized to run in parallel, so should be relatively rapid. If running slowly, check the scratch disk is set correctly.

Usage

threshold_apply(
  threshold = 0.5,
  roi_name = "test",
  video_path = "image826.avi",
  radians = 0.217604550320612,
  xlength = 60,
  ylength = 242,
  xstart = 696,
  ystart = 323,
  image_list = NULL,
  fps = NULL
)

Arguments

threshold	The threshold for the red channel. Range 0-1.
roi_name	Name assigned to the region of interest
video_path	Location of the video file to process
radians	Degrees to rotate the image, in radians
xlength	Number of x pixels in the ROI
ylength	Number of y pixels in the ROI
xstart	ROI starting x co-ordinate
ystart	ROI starting y co-ordinate
image_list	If pre-computed, a list of images to use rather than a video
fps	Number of fps to process, this can be set lower for validation

Value

Saves the quantified CSV and overlaid video in the same directory as the video

vmeasur documentation built on Nov. 12, 2021, 1:07 a.m.