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package hocr
// TODO: separate out linedetail to a general structure that can incorporate
// line-conf-buckets too, in a different file (and rename package to
// something more generic). Do this using the CopyableLine interface
// TODO: Parse line name to zero pad line numbers, so they come out in the correct order
import (
"encoding/xml"
"image"
"image/png"
"io"
"regexp"
"strconv"
"strings"
)
// TODO: move the linedetail stuff out to a separate file, and create a new
// CopyableLine implementing struct for ocropy, which will just store
// a file location
type LineDetail struct {
Name string
Avgconf float64
Img CopyableLine
Text string
Hocrname string
}
type CopyableLine interface {
CopyLineTo(io.Writer) (error)
}
type ImgDirect struct {
img image.Image
}
func (i ImgDirect) CopyLineTo(w io.Writer) (error) {
err := png.Encode(w, i.img)
if err != nil {
return err
}
return nil
}
type LineDetails []LineDetail
// Used by sort.Sort.
func (l LineDetails) Len() int { return len(l) }
// Used by sort.Sort.
func (l LineDetails) Less(i, j int) bool {
return l[i].Avgconf < l[j].Avgconf
}
// Used by sort.Sort.
func (l LineDetails) Swap(i, j int) { l[i], l[j] = l[j], l[i] }
type Hocr struct {
Lines []OcrLine `xml:"body>div>div>p>span"`
}
type OcrLine struct {
Class string `xml:"class,attr"`
Id string `xml:"id,attr"`
Title string `xml:"title,attr"`
Words []OcrWord `xml:"span"`
Text string `xml:",chardata"`
}
type OcrWord struct {
Class string `xml:"class,attr"`
Id string `xml:"id,attr"`
Title string `xml:"title,attr"`
Chars []OcrChar `xml:"span"`
Text string `xml:",chardata"`
}
type OcrChar struct {
Class string `xml:"class,attr"`
Id string `xml:"id,attr"`
Title string `xml:"title,attr"`
Chars []OcrChar `xml:"span"`
Text string `xml:",chardata"`
}
// Returns the confidence for a word based on its x_wconf value
func wordConf(s string) (float64, error) {
re, err := regexp.Compile(`x_wconf ([0-9.]+)`)
if err != nil {
return 0.0, err
}
conf := re.FindStringSubmatch(s)
return strconv.ParseFloat(conf[1], 64)
}
func boxCoords(s string) ([4]int, error) {
var coords [4]int
re, err := regexp.Compile(`bbox ([0-9]+) ([0-9]+) ([0-9]+) ([0-9]+)`)
if err != nil {
return coords, err
}
coordstr := re.FindStringSubmatch(s)
for i := range coords {
c, err := strconv.Atoi(coordstr[i+1])
if err != nil {
return coords, err
}
coords[i] = c
}
return coords, nil
}
func noText(s string) bool {
t := strings.Trim(s, " \n")
return len(t) == 0
}
func Parse(b []byte) (Hocr, error) {
var hocr Hocr
err := xml.Unmarshal(b, &hocr)
if err != nil {
return hocr, err
}
return hocr, nil
}
func GetLineDetails(h Hocr, i image.Image, name string) (LineDetails, error) {
lines := make(LineDetails, 0)
for _, l := range h.Lines {
totalconf := float64(0)
num := 0
for _, w := range l.Words {
c, err := wordConf(w.Title)
if err != nil {
return lines, err
}
num++
totalconf += c
}
coords, err := boxCoords(l.Title)
if err != nil {
return lines, err
}
var line LineDetail
line.Name = l.Id
line.Avgconf = (totalconf/float64(num)) / 100
linetext := ""
linetext = l.Text
if(noText(linetext)) {
linetext = ""
for _, w := range l.Words {
if(w.Class != "ocrx_word") {
continue
}
linetext += w.Text + " "
}
}
if(noText(linetext)) {
linetext = ""
for _, w := range l.Words {
if(w.Class != "ocrx_word") {
continue
}
for _, c := range w.Chars {
if(c.Class != "ocrx_cinfo") {
continue
}
linetext += c.Text
}
linetext += " "
}
}
line.Text = strings.TrimRight(linetext, " ")
line.Text += "\n"
line.Hocrname = name
var imgd ImgDirect
imgd.img = i.(*image.Gray).SubImage(image.Rect(coords[0], coords[1], coords[2], coords[3]))
line.Img = imgd
lines = append(lines, line)
}
return lines, nil
}
|
