mat2image
Rust crate that exposes ToImage
trait.
It implements ToImage
for
Mat to convert it
into DynamicImage.
It also exposes ToImageUnsafe
. The rationale behind this, comes after learning
through profiling that
Mat::iter
is painfully slow. Then Mat::to_image_unsafe
is implemented using
Mat::data
accessing the raw data.
Running examples
Save as
This example reads an image (examples/tinta_helada.jpg) using opencv and saves it using image API.
cargo run --release --example save_as [output_name[.jpg]=out.jpg]
Profiling
When noticing that to_image
takes too much time, I profiled using perf
and
visualized it with Firefox Profiler.
Full profiling:
# build example with debug symbols
cargo build --example save_as
# record perf data
# sudo because of `paranoid` kernel setting
sudo perf record -g -F 999 ./target/debug/examples/save_as
# convert output to firefox readable type
sudo perf script -F +pid >save_as.perf
Then load it in Firefox Profiler.
References
Notes
- Can we convert BGR to RGB cheaply? - Seems like it can't be done: image#1723
- cv-convert does not have implementation for Mat -> DynamicImage yet. There is an issue raised to merge this code into cv_convert.