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kmeg.go
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/
kmeg.go
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package kmeg
import (
"compress/gzip"
"encoding/binary"
"io"
"github.com/rameshputalapattu/kmeg/kmeans"
)
// Kmeg Struct to hold the Kmeg information
type Kmeg struct {
Quantlevels [][]uint8
Labels []int
Dx int
Dy int
}
// convert the data type of cluster centroids into uint8
func makeCenters(centroids [][]float32) [][]uint8 {
quantLevels := len(centroids)
centers := make([][]uint8, quantLevels)
for idx := range centers {
var features []uint8
for _, feature := range centroids[idx] {
features = append(features, uint8(feature))
}
centers[idx] = features
}
return centers
}
// MakeTrainingSet create a training set (samples) from the image pixel array
func MakeTrainingSet(data [][]uint8) [][]float32 {
trainingSet := make([][]float32, len(data))
for idx := range trainingSet {
var features []float32
for _, feature := range data[idx] {
features = append(features, float32(feature))
}
trainingSet[idx] = features
}
return trainingSet
}
// Deflate Take in the kmeans object (Which has image information as the training samples)
// and return Kmeg representation
func Deflate(km *kmeans.KMeans, dx int) (*Kmeg, error) {
err := km.Cluster()
if err != nil {
return nil, err
}
kmeg := Kmeg{
Quantlevels: makeCenters(km.Centroids),
Labels: km.Labels(),
Dx: dx,
Dy: len(km.Labels()) / dx,
}
return &kmeg, nil
}
// Inflate returns RGBImage representation from the kmeg representation
func Inflate(kmeg *Kmeg) *RGBImage {
dx := kmeg.Dx
dy := len(kmeg.Labels) / dx
Pix := make([][]uint8, len(kmeg.Labels))
for idx := range Pix {
Pix[idx] = kmeg.Quantlevels[kmeg.Labels[idx]]
}
rgb := RGBImage{
Pix: Pix,
Dx: dx,
Dy: dy,
}
return &rgb
}
// Encode : Serialize kmeg representation into kmeg binary format
func Encode(w io.Writer, kmg *Kmeg) error {
gzw := gzip.NewWriter(w)
defer gzw.Close()
//gzw := w
err := binary.Write(gzw, binary.BigEndian, int64(kmg.Dx))
if err != nil {
return err
}
err = binary.Write(gzw, binary.BigEndian, int64(kmg.Dy))
if err != nil {
return err
}
for _, label := range kmg.Labels {
err := binary.Write(gzw, binary.BigEndian, uint8(label))
if err != nil {
return err
}
}
for _, quant := range kmg.Quantlevels {
for _, color := range quant {
err := binary.Write(gzw, binary.BigEndian, uint8(color))
if err != nil {
return err
}
}
}
return nil
}
// Decode : Deserialize the kmeg binary format to in-memory Kmeg structure
func Decode(r io.Reader) (*Kmeg, error) {
var dx int64
var err error
gzr, err := gzip.NewReader(r)
defer gzr.Close()
if err != nil {
return nil, err
}
err = binary.Read(gzr, binary.BigEndian, &dx)
if err != nil {
return nil, err
}
var dy int64
err = binary.Read(gzr, binary.BigEndian, &dy)
if err != nil {
return nil, err
}
labels := make([]uint8, int(dx)*int(dy))
err = binary.Read(gzr, binary.BigEndian, labels)
if err != nil {
return nil, err
}
var quantizedLevels [][]uint8
for err != io.EOF {
var pix []uint8
for i := 0; i < 3; i++ {
var color uint8
err = binary.Read(gzr, binary.BigEndian, &color)
if err == io.EOF {
break
}
if err != nil && err != io.EOF {
return nil, err
}
pix = append(pix, color)
}
if err == io.EOF {
continue
}
quantizedLevels = append(quantizedLevels, pix)
}
var labelints []int
for _, elem := range labels {
labelints = append(labelints, int(elem))
}
kmg := Kmeg{
Quantlevels: quantizedLevels,
Labels: labelints,
Dx: int(dx),
Dy: int(dy),
}
return &kmg, nil
}