Image object by handimage_align() rotate an image given a line of desired aligment along the y
axis that corresponds to the alignment of the objects (e.g., field plots). By
default, the aligment will be to the vertical, which means that if the drawed
line have an angle < 90º parallel to the x axis, the rotation angle wil be
negative (anticlocwise rotation).
image_align(
img,
align = c("vertical", "horizontal"),
viewer = get_pliman_viewer(),
plot = TRUE
)The img aligned
An Image object
The desired alignment. Either "vertical" (default) or
"horizontal".
The viewer option. If not provided, the value is retrieved
using get_pliman_viewer(). This option controls the type of viewer to use
for interactive plotting. The available options are "base" and "mapview".
If set to "base", the base R graphics system is used for interactive
plotting. If set to "mapview", the mapview package is used. To set this
argument globally for all functions in the package, you can use the
set_pliman_viewer() function. For example, you can run
set_pliman_viewer("mapview") to set the viewer option to "mapview" for
all functions.
Plots the aligned image? Defaults to TRUE.
The image_align function aligns an image along the vertical or horizontal
axis based on user-selected points. The alignment can be performed in either
the base plotting system or using the mapview package for interactive
visualization. If the viewer option is set to "base", the function prompts
the user to select two points on the image to define the alignment line. If
the viewer option is set to "mapview", the function opens an interactive map
where the user can draw a polyline to define the alignment line. The
alignment angle is calculated based on the selected points, and the image is
rotated accordingly using the image_rotate function. The function returns
the aligned image object.
if(interactive()){
library(pliman)
flax <- image_pliman("flax_leaves.jpg", plot = TRUE)
aligned <- image_align(flax)
}
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