package hocr // TODO: consider making GetLineDetails() a function of Hocr, so could do a // similar thing with prob format files too. // TODO: Parse line name to zero pad line numbers, so they come out in the correct order import ( "encoding/xml" "image" "regexp" "strconv" "strings" "git.rescribe.xyz/testingtools/parse" ) 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) (parse.LineDetails, error) { lines := make(parse.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 parse.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 parse.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 }