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twain3.0/3rdparty/hgOCR/include/ccstruct/blobs.h

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/* -*-C-*-
********************************************************************************
*
* File: blobs.h (Formerly blobs.h)
* Description: Blob definition
* Author: Mark Seaman, OCR Technology
* Created: Fri Oct 27 15:39:52 1989
* Modified: Thu Mar 28 15:33:38 1991 (Mark Seaman) marks@hpgrlt
* Language: C
* Package: N/A
* Status: Experimental (Do Not Distribute)
*
* (c) Copyright 1989, Hewlett-Packard Company.
** 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 BLOBS_H
#define BLOBS_H
/*----------------------------------------------------------------------
I n c l u d e s
----------------------------------------------------------------------*/
#include "clst.h"
#include "normalis.h"
#include "publictypes.h"
#include "rect.h"
#include "vecfuncs.h"
class BLOCK;
class C_BLOB;
class C_OUTLINE;
class LLSQ;
class ROW;
class WERD;
/*----------------------------------------------------------------------
T y p e s
----------------------------------------------------------------------*/
#define EDGEPTFLAGS 4 /*concavity,length etc. */
struct TPOINT {
TPOINT(): x(0), y(0) {}
TPOINT(inT16 vx, inT16 vy) : x(vx), y(vy) {}
TPOINT(const ICOORD &ic) : x(ic.x()), y(ic.y()) {}
void operator+=(const TPOINT& other) {
x += other.x;
y += other.y;
}
void operator/=(int divisor) {
x /= divisor;
y /= divisor;
}
bool operator==(const TPOINT& other) const {
return x == other.x && y == other.y;
}
// Returns true when the two line segments cross each other.
// (Moved from outlines.cpp).
static bool IsCrossed(const TPOINT& a0, const TPOINT& a1, const TPOINT& b0,
const TPOINT& b1);
inT16 x; // absolute x coord.
inT16 y; // absolute y coord.
};
typedef TPOINT VECTOR; // structure for coordinates.
struct EDGEPT {
EDGEPT()
: next(NULL), prev(NULL), src_outline(NULL), start_step(0), step_count(0) {
memset(flags, 0, EDGEPTFLAGS * sizeof(flags[0]));
}
EDGEPT(const EDGEPT& src) : next(NULL), prev(NULL) {
CopyFrom(src);
}
EDGEPT& operator=(const EDGEPT& src) {
CopyFrom(src);
return *this;
}
// Copies the data elements, but leaves the pointers untouched.
void CopyFrom(const EDGEPT& src) {
pos = src.pos;
vec = src.vec;
memcpy(flags, src.flags, EDGEPTFLAGS * sizeof(flags[0]));
src_outline = src.src_outline;
start_step = src.start_step;
step_count = src.step_count;
}
// Returns the squared distance between the points, with the x-component
// weighted by x_factor.
int WeightedDistance(const EDGEPT& other, int x_factor) const {
int x_dist = pos.x - other.pos.x;
int y_dist = pos.y - other.pos.y;
return x_dist * x_dist * x_factor + y_dist * y_dist;
}
// Returns true if the positions are equal.
bool EqualPos(const EDGEPT& other) const { return pos == other.pos; }
// Returns the bounding box of the outline segment from *this to *end.
// Ignores hidden edge flags.
TBOX SegmentBox(const EDGEPT* end) const {
TBOX box(pos.x, pos.y, pos.x, pos.y);
const EDGEPT* pt = this;
do {
pt = pt->next;
if (pt->pos.x < box.left()) box.set_left(pt->pos.x);
if (pt->pos.x > box.right()) box.set_right(pt->pos.x);
if (pt->pos.y < box.bottom()) box.set_bottom(pt->pos.y);
if (pt->pos.y > box.top()) box.set_top(pt->pos.y);
} while (pt != end && pt != this);
return box;
}
// Returns the area of the outline segment from *this to *end.
// Ignores hidden edge flags.
int SegmentArea(const EDGEPT* end) const {
int area = 0;
const EDGEPT* pt = this->next;
do {
TPOINT origin_vec(pt->pos.x - pos.x, pt->pos.y - pos.y);
area += CROSS(origin_vec, pt->vec);
pt = pt->next;
} while (pt != end && pt != this);
return area;
}
// Returns true if the number of points in the outline segment from *this to
// *end is less that min_points and false if we get back to *this first.
// Ignores hidden edge flags.
bool ShortNonCircularSegment(int min_points, const EDGEPT* end) const {
int count = 0;
const EDGEPT* pt = this;
do {
if (pt == end) return true;
pt = pt->next;
++count;
} while (pt != this && count <= min_points);
return false;
}
// Accessors to hide or reveal a cut edge from feature extractors.
void Hide() {
flags[0] = true;
}
void Reveal() {
flags[0] = false;
}
bool IsHidden() const {
return flags[0] != 0;
}
void MarkChop() {
flags[2] = true;
}
bool IsChopPt() const {
return flags[2] != 0;
}
TPOINT pos; // position
VECTOR vec; // vector to next point
// TODO(rays) Remove flags and replace with
// is_hidden, runlength, dir, and fixed. The only use
// of the flags other than is_hidden is in polyaprx.cpp.
char flags[EDGEPTFLAGS]; // concavity, length etc
EDGEPT* next; // anticlockwise element
EDGEPT* prev; // clockwise element
C_OUTLINE* src_outline; // Outline it came from.
// The following fields are not used if src_outline is NULL.
int start_step; // Location of pos in src_outline.
int step_count; // Number of steps used (may wrap around).
};
// For use in chop and findseam to keep a list of which EDGEPTs were inserted.
CLISTIZEH(EDGEPT);
struct TESSLINE {
TESSLINE() : is_hole(false), loop(NULL), next(NULL) {}
TESSLINE(const TESSLINE& src) : loop(NULL), next(NULL) {
CopyFrom(src);
}
~TESSLINE() {
Clear();
}
TESSLINE& operator=(const TESSLINE& src) {
CopyFrom(src);
return *this;
}
// Consume the circular list of EDGEPTs to make a TESSLINE.
static TESSLINE* BuildFromOutlineList(EDGEPT* outline);
// Copies the data and the outline, but leaves next untouched.
void CopyFrom(const TESSLINE& src);
// Deletes owned data.
void Clear();
// Normalize in-place using the DENORM.
void Normalize(const DENORM& denorm);
// Rotates by the given rotation in place.
void Rotate(const FCOORD rotation);
// Moves by the given vec in place.
void Move(const ICOORD vec);
// Scales by the given factor in place.
void Scale(float factor);
// Sets up the start and vec members of the loop from the pos members.
void SetupFromPos();
// Recomputes the bounding box from the points in the loop.
void ComputeBoundingBox();
// Computes the min and max cross product of the outline points with the
// given vec and returns the results in min_xp and max_xp. Geometrically
// this is the left and right edge of the outline perpendicular to the
// given direction, but to get the distance units correct, you would
// have to divide by the modulus of vec.
void MinMaxCrossProduct(const TPOINT vec, int* min_xp, int* max_xp) const;
TBOX bounding_box() const;
// Returns true if *this and other have equal bounding boxes.
bool SameBox(const TESSLINE& other) const {
return topleft == other.topleft && botright == other.botright;
}
// Returns true if the given line segment crosses any outline of this blob.
bool SegmentCrosses(const TPOINT& pt1, const TPOINT& pt2) const {
if (Contains(pt1) && Contains(pt2)) {
EDGEPT* pt = loop;
do {
if (TPOINT::IsCrossed(pt1, pt2, pt->pos, pt->next->pos)) return true;
pt = pt->next;
} while (pt != loop);
}
return false;
}
// Returns true if the point is contained within the outline box.
bool Contains(const TPOINT& pt) const {
return topleft.x <= pt.x && pt.x <= botright.x &&
botright.y <= pt.y && pt.y <= topleft.y;
}
#ifndef GRAPHICS_DISABLED
void plot(ScrollView* window, ScrollView::Color color,
ScrollView::Color child_color);
#endif // GRAPHICS_DISABLED
// Returns the first outline point that has a different src_outline to its
// predecessor, or, if all the same, the lowest indexed point.
EDGEPT* FindBestStartPt() const;
int BBArea() const {
return (botright.x - topleft.x) * (topleft.y - botright.y);
}
TPOINT topleft; // Top left of loop.
TPOINT botright; // Bottom right of loop.
TPOINT start; // Start of loop.
bool is_hole; // True if this is a hole/child outline.
EDGEPT *loop; // Edgeloop.
TESSLINE *next; // Next outline in blob.
}; // Outline structure.
struct TBLOB {
TBLOB() : outlines(NULL) {}
TBLOB(const TBLOB& src) : outlines(NULL) {
CopyFrom(src);
}
~TBLOB() {
Clear();
}
TBLOB& operator=(const TBLOB& src) {
CopyFrom(src);
return *this;
}
// Factory to build a TBLOB from a C_BLOB with polygonal approximation along
// the way. If allow_detailed_fx is true, the EDGEPTs in the returned TBLOB
// contain pointers to the input C_OUTLINEs that enable higher-resolution
// feature extraction that does not use the polygonal approximation.
static TBLOB* PolygonalCopy(bool allow_detailed_fx, C_BLOB* src);
// Factory builds a blob with no outlines, but copies the other member data.
static TBLOB* ShallowCopy(const TBLOB& src);
// Normalizes the blob for classification only if needed.
// (Normally this means a non-zero classify rotation.)
// If no Normalization is needed, then NULL is returned, and the input blob
// can be used directly. Otherwise a new TBLOB is returned which must be
// deleted after use.
TBLOB* ClassifyNormalizeIfNeeded() const;
// Copies the data and the outlines, but leaves next untouched.
void CopyFrom(const TBLOB& src);
// Deletes owned data.
void Clear();
// Sets up the built-in DENORM and normalizes the blob in-place.
// For parameters see DENORM::SetupNormalization, plus the inverse flag for
// this blob and the Pix for the full image.
void Normalize(const BLOCK* block,
const FCOORD* rotation,
const DENORM* predecessor,
float x_origin, float y_origin,
float x_scale, float y_scale,
float final_xshift, float final_yshift,
bool inverse, Pix* pix);
// Rotates by the given rotation in place.
void Rotate(const FCOORD rotation);
// Moves by the given vec in place.
void Move(const ICOORD vec);
// Scales by the given factor in place.
void Scale(float factor);
// Recomputes the bounding boxes of the outlines.
void ComputeBoundingBoxes();
// Returns the number of outlines.
int NumOutlines() const;
TBOX bounding_box() const;
// Returns true if the given line segment crosses any outline of this blob.
bool SegmentCrossesOutline(const TPOINT& pt1, const TPOINT& pt2) const {
for (const TESSLINE* outline = outlines; outline != NULL;
outline = outline->next) {
if (outline->SegmentCrosses(pt1, pt2)) return true;
}
return false;
}
// Returns true if the point is contained within any of the outline boxes.
bool Contains(const TPOINT& pt) const {
for (const TESSLINE* outline = outlines; outline != NULL;
outline = outline->next) {
if (outline->Contains(pt)) return true;
}
return false;
}
// Finds and deletes any duplicate outlines in this blob, without deleting
// their EDGEPTs.
void EliminateDuplicateOutlines();
// Swaps the outlines of *this and next if needed to keep the centers in
// increasing x.
void CorrectBlobOrder(TBLOB* next);
const DENORM& denorm() const {
return denorm_;
}
#ifndef GRAPHICS_DISABLED
void plot(ScrollView* window, ScrollView::Color color,
ScrollView::Color child_color);
#endif // GRAPHICS_DISABLED
int BBArea() const {
int total_area = 0;
for (TESSLINE* outline = outlines; outline != NULL; outline = outline->next)
total_area += outline->BBArea();
return total_area;
}
// Computes the center of mass and second moments for the old baseline and
// 2nd moment normalizations. Returns the outline length.
// The input denorm should be the normalizations that have been applied from
// the image to the current state of this TBLOB.
int ComputeMoments(FCOORD* center, FCOORD* second_moments) const;
// Computes the precise bounding box of the coords that are generated by
// GetEdgeCoords. This may be different from the bounding box of the polygon.
void GetPreciseBoundingBox(TBOX* precise_box) const;
// Adds edges to the given vectors.
// For all the edge steps in all the outlines, or polygonal approximation
// where there are no edge steps, collects the steps into x_coords/y_coords.
// x_coords is a collection of the x-coords of vertical edges for each
// y-coord starting at box.bottom().
// y_coords is a collection of the y-coords of horizontal edges for each
// x-coord starting at box.left().
// Eg x_coords[0] is a collection of the x-coords of edges at y=bottom.
// Eg x_coords[1] is a collection of the x-coords of edges at y=bottom + 1.
void GetEdgeCoords(const TBOX& box,
GenericVector<GenericVector<int> >* x_coords,
GenericVector<GenericVector<int> >* y_coords) const;
TESSLINE *outlines; // List of outlines in blob.
private: // TODO(rays) Someday the data members will be private too.
// For all the edge steps in all the outlines, or polygonal approximation
// where there are no edge steps, collects the steps into the bounding_box,
// llsq and/or the x_coords/y_coords. Both are used in different kinds of
// normalization.
// For a description of x_coords, y_coords, see GetEdgeCoords above.
void CollectEdges(const TBOX& box,
TBOX* bounding_box, LLSQ* llsq,
GenericVector<GenericVector<int> >* x_coords,
GenericVector<GenericVector<int> >* y_coords) const;
private:
// DENORM indicating the transformations that this blob has undergone so far.
DENORM denorm_;
}; // Blob structure.
struct TWERD {
TWERD() : latin_script(false) {}
TWERD(const TWERD& src) {
CopyFrom(src);
}
~TWERD() {
Clear();
}
TWERD& operator=(const TWERD& src) {
CopyFrom(src);
return *this;
}
// Factory to build a TWERD from a (C_BLOB) WERD, with polygonal
// approximation along the way.
static TWERD* PolygonalCopy(bool allow_detailed_fx, WERD* src);
// Baseline normalizes the blobs in-place, recording the normalization in the
// DENORMs in the blobs.
void BLNormalize(const BLOCK* block, const ROW* row, Pix* pix, bool inverse,
float x_height, float baseline_shift, bool numeric_mode,
tesseract::OcrEngineMode hint,
const TBOX* norm_box,
DENORM* word_denorm);
// Copies the data and the blobs, but leaves next untouched.
void CopyFrom(const TWERD& src);
// Deletes owned data.
void Clear();
// Recomputes the bounding boxes of the blobs.
void ComputeBoundingBoxes();
// Returns the number of blobs in the word.
int NumBlobs() const {
return blobs.size();
}
TBOX bounding_box() const;
// Merges the blobs from start to end, not including end, and deletes
// the blobs between start and end.
void MergeBlobs(int start, int end);
void plot(ScrollView* window);
GenericVector<TBLOB*> blobs; // Blobs in word.
bool latin_script; // This word is in a latin-based script.
};
/*----------------------------------------------------------------------
F u n c t i o n s
----------------------------------------------------------------------*/
// TODO(rays) Make divisible_blob and divide_blobs members of TBLOB.
bool divisible_blob(TBLOB *blob, bool italic_blob, TPOINT* location);
void divide_blobs(TBLOB *blob, TBLOB *other_blob, bool italic_blob,
const TPOINT& location);
#endif
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