summaryrefslogtreecommitdiff
path: root/pkg/hocr/lines.go
blob: b3db161a012464dbbaf9a0450705fe19c8c6094d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
package hocr

// TODO: Parse line name to zero pad line numbers, so they can
//       be sorted easily

import (
	"image"
	"image/draw"
	_ "image/jpeg"
	_ "image/png"
	"io/ioutil"
	"os"
	"path/filepath"
	"strings"

	"rescribe.xyz/utils/pkg/line"
)

func LineText(l OcrLine) (string) {
	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 += " "
		}
	}
	linetext = strings.TrimRight(linetext, " ")
	return linetext
}

func parseLineDetails(h Hocr, i *image.Gray, name string) (line.Details, error) {
	lines := make(line.Details, 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 ln line.Detail
		ln.Name = l.Id
		ln.Avgconf = (totalconf / float64(num)) / 100
		ln.Text = LineText(l)
		ln.OcrName = name
		if i != nil {
			var imgd line.ImgDirect
			imgd.Img = i.SubImage(image.Rect(coords[0], coords[1], coords[2], coords[3]))
			ln.Img = imgd
		}
		lines = append(lines, ln)
	}
	return lines, nil
}

// GetLineDetails parses a hocr file and returns a corresponding
// line.Details, including image extracts for each line.
func GetLineDetails(hocrfn string) (line.Details, error) {
	var newlines line.Details

	file, err := ioutil.ReadFile(hocrfn)
	if err != nil {
		return newlines, err
	}

	h, err := Parse(file)
	if err != nil {
		return newlines, err
	}

	var img image.Image
	var gray *image.Gray
	pngfn := strings.Replace(hocrfn, ".hocr", ".png", 1)
	pngf, err := os.Open(pngfn)
	if err == nil {
		defer pngf.Close()
		img, _, err = image.Decode(pngf)
		if err == nil {
			b := img.Bounds()
			gray = image.NewGray(image.Rect(0, 0, b.Dx(), b.Dy()))
			draw.Draw(gray, b, img, b.Min, draw.Src)
		}
	}

	n := strings.Replace(filepath.Base(hocrfn), ".hocr", "", 1)
	return parseLineDetails(h, gray, n)
}

// GetLineBasics parses a hocr file and returns a corresponding
// line.Details, without any image extracts.
func GetLineBasics(hocrfn string) (line.Details, error) {
	var newlines line.Details

	file, err := ioutil.ReadFile(hocrfn)
	if err != nil {
		return newlines, err
	}

	h, err := Parse(file)
	if err != nil {
		return newlines, err
	}

	n := strings.Replace(filepath.Base(hocrfn), ".hocr", "", 1)
	return parseLineDetails(h, nil, n)
}