Package index • Retina

Image class

The core R6 class for image data.

Image: Image class

Color utilities

Convert R color specifications to OpenCV BGR(A) format.

col2bgr(): Convert an R color to a BGR(A) numeric vector

Channel operations

Split and merge image channels.

split_channels(): Split an image into its individual channels
merge_channels(): Merge a list of single-channel images into a multi-channel image

Image construction

Standalone functions for creating and combining images.

concatenate(): Concatenate images side-by-side or top-to-bottom

Geometric transform helpers

Construct affine and perspective transformation matrices for use with Image$warp_affine() and Image$warp_perspective().

affine_translate(): Build an affine translation matrix
affine_scale(): Build an affine scaling matrix
affine_shear(): Build an affine shear matrix
affine_rotate(): Build an affine rotation matrix
affine_from_points(): Compute an affine transformation matrix from point correspondences
perspective_from_points(): Compute a perspective transformation matrix from point correspondences

Arithmetic and bitwise operators

S3 generics for arithmetic and bitwise operations on images.

bitwAnd() bitwOr() bitwXor() bitwNot(): Bitwise operations for Image objects

Statistical utilities

S3 generics for image statistics.

sd(): Standard deviation for Image objects
var(): Variance for Image objects

Filter utilities

Construct kernel matrices for filtering and morphology operations.

get_gabor_kernel(): Generate a Gabor filter kernel
get_structuring_element(): Generate a structuring element kernel

Thresholding utilities

Compute threshold values without modifying the image.

autothreshold_value(): Compute an automatic threshold value from an image

Drawing utilities

Measure text extents before drawing.

get_text_size(): Measure the bounding box of a text string

Display

Open an interactive display window.

display(): Display an image using R's graphics device