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///////////////////////////////////////////////////////////////////////
// File: equationdetectbase.h
// Description: The base class equation detection class.
// Author: Zongyi (Joe) Liu (joeliu@google.com)
// Created: Fri Aug 31 11:13:01 PST 2011
//
// (C) Copyright 2011, Google Inc.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
///////////////////////////////////////////////////////////////////////
#ifndef TESSERACT_TEXTORD_EQUATIONDETECTBASE_H_
#define TESSERACT_TEXTORD_EQUATIONDETECTBASE_H_
class BLOBNBOX_LIST;
class TO_BLOCK;
struct Pix;
namespace tesseract {
class ColPartitionGrid;
class ColPartitionSet;
class TESS_API EquationDetectBase {
public:
EquationDetectBase() = default;
virtual ~EquationDetectBase();
// Iterate over the blobs inside to_block, and set the blobs that we want to
// process to BSTT_NONE. (By default, they should be BSTT_SKIP). The function
// returns 0 upon success.
virtual int LabelSpecialText(TO_BLOCK* to_block) = 0;
// Interface to find possible equation partition grid from part_grid. This
// should be called after IdentifySpecialText function.
virtual int FindEquationParts(ColPartitionGrid* part_grid,
ColPartitionSet** best_columns) = 0;
// Debug function: Render a bounding box on pix based on the value of its
// special_text_type, specifically:
// BSTT_MATH: red box
// BSTT_DIGIT: cyan box
// BSTT_ITALIC: green box
// BSTT_UNCLEAR: blue box
// All others: yellow box
static void RenderSpecialText(Pix* pix, BLOBNBOX* blob);
};
} // namespace tesseract
#endif // TESSERACT_TEXTORD_EQUATIONDETECTBASE_H_
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