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equationdetectbase.h
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1
2 // File: equationdetectbase.h
3 // Description: The base class equation detection class.
4 // Author: Zongyi (Joe) Liu (joeliu@google.com)
5 // Created: Fri Aug 31 11:13:01 PST 2011
6 //
7 // (C) Copyright 2011, Google Inc.
8 // Licensed under the Apache License, Version 2.0 (the "License");
9 // you may not use this file except in compliance with the License.
10 // You may obtain a copy of the License at
11 // http://www.apache.org/licenses/LICENSE-2.0
12 // Unless required by applicable law or agreed to in writing, software
13 // distributed under the License is distributed on an "AS IS" BASIS,
14 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 // See the License for the specific language governing permissions and
16 // limitations under the License.
17 //
19
20 #ifndef TESSERACT_TEXTORD_EQUATIONDETECTBASE_H__
21 #define TESSERACT_TEXTORD_EQUATIONDETECTBASE_H__
22
23 class BLOBNBOX_LIST;
24 class TO_BLOCK;
25 struct Pix;
26
27 namespace tesseract {
28
29 class ColPartitionGrid;
30 class ColPartitionSet;
31
32 class EquationDetectBase {
33 public:
34 EquationDetectBase();
35 virtual ~EquationDetectBase();
36
37 // Iterate over the blobs inside to_block, and set the blobs that we want to
38 // process to BSTT_NONE. (By default, they should be BSTT_SKIP). The function
39 // returns 0 upon success.
40 virtual int LabelSpecialText(TO_BLOCK* to_block) = 0;
41
42 // Interface to find possible equation partition grid from part_grid. This
43 // should be called after IdentifySpecialText function.
44 virtual int FindEquationParts(ColPartitionGrid* part_grid,
45 ColPartitionSet** best_columns) = 0;
46
47 // Debug function: Render a bounding box on pix based on the value of its
48 // special_text_type, specifically:
49 // BSTT_MATH: red box
50 // BSTT_DIGIT: cyan box
51 // BSTT_ITALIC: green box
52 // BSTT_UNCLEAR: blue box
53 // All others: yellow box
54 static void RenderSpecialText(Pix* pix, BLOBNBOX* blob);
55 };
56
57 }; // namespace tesseract
58
59 #endif // TESSERACT_TEXTORD_EQUATIONDETECTBASE_H__