openjpeg_go

package module

v0.0.5 Latest Latest Go to latest Published: Dec 13, 2022 License: Apache-2.0 Imports: 13 Imported by: 1

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Repository

github.com/linxlib/openjpeg

Links

Open Source Insights

README ¶

openjpeg

golang wrapper for openjpeg library v2.5.0

description

only tested on windows x64 (Windows 7 Windows 10) Mac OS X 13 centos 7 ubuntu 22.04. you should test it yourself for other platforms.

usage

refer to example dir

import openjpeg "github.com/linxlib/openjpeg"

build

install golang > 1.18 first

Windows

install MSYS2
add C:\msys64\mingw64\bin to PATH environment
open MSYS2 MSYS from start menu, install gcc with pacman -S mingw-w64-x86_64-gcc
git clone https://github.com/linxlib/openjpeg
cd openjpeg\example
go run -v .\main.go
then you get a jp2000.jpg in the same dir. you can change the example code to get different image file

Linux (Centos 7)

The version of openjpeg in package manager may not the latest (v2.5.0), so we need to build from source.

build and install openjpeg 2.5.0 (optional)

install gcc cmake ...etc
wget https://github.com/uclouvain/openjpeg/archive/refs/tags/v2.5.0.zip
unzip v2.5.0.zip && cd openjpeg-2.5.0/
mkdir build && cd build
cmake .. -DCMAKE_BUILD_TYPE=Release -DBUILD_SHARED_LIBS:bool=on
make
make install
you will find openjpeg(libopenjp2) library and in /usr/local/lib /usr/local/include ...

run

git clone https://github.com/linxlib/openjpeg
cd openjpeg\example
go run main.go
then you get a jp2000.jpg in the same dir. you can change the example code to get different image file

Mac OS X

May be you don't need to install openjpeg just like linux.

configure cgo compile environment by yourself
if you have installed ffmpeg, so openjpeg 2.5.0 already installed, just skip the next step
brew install openjpeg and make sure opj_decompress -h can get something like openjp2 library v2.5.0
git clone https://github.com/linxlib/openjpeg
cd openjpeg/example
go run main.go
then you get a jp2000.jpg in the same dir. you can change the example code to get different image file

TODO

cross compile (compile executable file in only one platform (may be docker))
add some other platforms support

Documentation ¶

Index ¶

Constants
func Crop(i image.Image, rectangle *image.Rectangle) image.Image
func Decode(r io.Reader) (img image.Image, err error)
func DecodeConfig(r io.Reader) (cfg image.Config, err error)
func Encode(o io.WriteSeeker, img image.Image, opt *Options) (err error)
func GetPixStride(i image.Image) ([]byte, int)
func GetSSR(r image.Image, alt image.YCbCrSubsampleRatio) image.YCbCrSubsampleRatio
func IsGray(img image.Image, fuzz int) bool
func NewImage(c color.Model, r image.Rectangle) image.Image
func NewImageColorAs(template image.Image, r image.Rectangle)
func NewImageSSR(c color.Model, ssr image.YCbCrSubsampleRatio, r image.Rectangle) image.Image
func SSR2VHDiv(i image.YCbCrSubsampleRatio) (v, h int)
func ToGray(img image.Image, fuzz int) (gr *image.Gray)
func ToModel(img image.Image, c color.Model) (gr image.Image)
func VHDiv2SSR(v, h int) image.YCbCrSubsampleRatio
type DicomImage
type Options
type SubImage

Constants ¶

View Source

const YCbCrSubsampleRatioUnknown = -1

Variables ¶

This section is empty.

Functions ¶

func Crop ¶

func Crop(i image.Image, rectangle *image.Rectangle) image.Image

func Decode ¶

func Decode(r io.Reader) (img image.Image, err error)

func DecodeConfig ¶

func DecodeConfig(r io.Reader) (cfg image.Config, err error)

func Encode ¶

func Encode(o io.WriteSeeker, img image.Image, opt *Options) (err error)

func GetPixStride ¶

func GetPixStride(i image.Image) ([]byte, int)

func GetSSR ¶

func GetSSR(r image.Image, alt image.YCbCrSubsampleRatio) image.YCbCrSubsampleRatio

Get sub-sampling ratio if color space has one (0 = no sub-sampling).

func IsGray ¶

func IsGray(img image.Image, fuzz int) bool

func NewImage ¶

func NewImage(c color.Model, r image.Rectangle) image.Image

Create a new Image of specified color model.

func NewImageColorAs ¶

func NewImageColorAs(template image.Image, r image.Rectangle)

Create a new image "in the image" of template, that is, of same color model.

func NewImageSSR ¶

func NewImageSSR(c color.Model, ssr image.YCbCrSubsampleRatio, r image.Rectangle) image.Image

func SSR2VHDiv ¶

func SSR2VHDiv(i image.YCbCrSubsampleRatio) (v, h int)

Translate Go's sub-sampling rate to V/H divisors.

func ToGray ¶

func ToGray(img image.Image, fuzz int) (gr *image.Gray)

Attempt conversion of the input image into greyscale. Fuzz is is a threshold when a color picture is considered greyscale, Higher fuzz will accept more of color variance. If picture is above fuzz, "too colorish", nil is returned. If fuzz threshold is -1, the conversion is done always.

func ToModel ¶

func ToModel(img image.Image, c color.Model) (gr image.Image)

func VHDiv2SSR ¶

func VHDiv2SSR(v, h int) image.YCbCrSubsampleRatio

Translate vertical-horizontal chroma divisors to Go's sub-sampling rate.

Types ¶

type DicomImage ¶ added in v0.0.4

type DicomImage struct {
	// contains filtered or unexported fields
}

func (*DicomImage) At ¶ added in v0.0.4

func (p *DicomImage) At(x, y int) color.Color

func (*DicomImage) Bounds ¶ added in v0.0.4

func (p *DicomImage) Bounds() image.Rectangle

func (*DicomImage) ColorModel ¶ added in v0.0.4

func (p *DicomImage) ColorModel() color.Model

func (*DicomImage) PixOffset ¶ added in v0.0.4

func (p *DicomImage) PixOffset(x, y int) int

func (*DicomImage) SetWindowLevel ¶ added in v0.0.4

func (p *DicomImage) SetWindowLevel(wl int16)

func (*DicomImage) SetWindowWidth ¶ added in v0.0.4

func (p *DicomImage) SetWindowWidth(ww int16)

func (*DicomImage) WindowLevel ¶ added in v0.0.4

func (p *DicomImage) WindowLevel() int16

func (*DicomImage) WindowWidth ¶ added in v0.0.4

func (p *DicomImage) WindowWidth() int16

type Options ¶

type Options struct {
	BPP          int
	Ratio        []float32
	PSNR         []float32
	NResolutions int
}

type SubImage ¶

type SubImage interface {
	SubImage(r image.Rectangle) image.Image
}

Source Files ¶

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