catalog.txt

NIST Handwriting OCR Testbed

 rm_bl_corner_1_sided - removes the bot-left corner of line data
                using a slope projection from one side.
 rm_bl_corner_2_sided - removes the bot-left corner of line data
                by projecting a cut line between two points.
 bl_corner_cut_slope - determines the slope for cutting off the
                bot-left corner of line data.
 sum_dys_bl_corner - computes changes in y used to estimate the
                slope along which the bot-left corner will be cut.
 is_boot - determines if the character piece touches along the bottom of
           the line.
 process_boot - removes the line data from the "boot" charater stroke.

 boot_left_right_steps - determines the ratio of left to right steps
                based on projected cut slopes on both sides of the boot.

 rm_br_corner_1_sided - removes the bot-right corner of line data
                using a slope projection from one side.
 rm_br_corner_2_sided - removes the bot-right corner of line data
                by projecting a cut line between two points.
 br_corner_cut_slope - determines the slope for cutting off the
                bot-right corner of line data.
 sum_dys_br_corner - computes changes in y used to estimate the
                slope along which the bot-right corner will be cut.
 process_char_pieces_ml - shapes and smooths stems and descenders of character
              strokes that intersect the lines using a locally dynamic vector
              of median line widths.
 identify_char_piece - categorizes the character piece by examining
              its left and right edges.
 extract_shape_features - computes 4 features used to represent the
              character piece.
 process_char_piece - main switch for shaping and smoothing a character
              piece based on its identified type.
 hough_lines_hori - computes the hough transform(s) for detecting lines
                    with angles in the range [-range .. +range].
 hough_lines - computes the hough transform for detecting lines within the
               specified range of "normal" angles.
 gen_slope_point - computes a line's slope and normal vector intersection
                   point given a location within a hough transform matrix.
 der2_change_right_up - locates an elbow that bends upward left to right
             by analyzing 2nd derivative information from a list of integers.
 der2_change_right_down - locates an elbow that bends downward left to right
             by analyzing 2nd derivative information from a list of integers.
 der2_change_left_up - locates an elbow that bends upward right to left
             by analyzing 2nd derivative information from a list of integers.
 der2_change_left_down - locates an elbow that bends downward right to left
             by analyzing 2nd derivative information from a list of integers.
 is_hat - determines if the character piece that rests on top of the line.

 process_hat - removes the line data from the "hat" charater stroke.

 hat_left_right_steps - determines the ratio of left to right steps
                based on projected cut slopes on both sides of the hat.

 fill_line_breaks - takes a sparse set of line points and extends the last point
                    to the left of each void through the break.
 interpolate_line_breaks - takes a sparse set of line points and interpolates
                    across the breaks.
 is_ncross - determines if the character piece passes through the line
           top-to-bottom and right-to-left.
 process_ncross - removes the line data from the "ncross" charater stroke.

 is_pcross - determines if the character piece passes through the line
           top-to-bottom and left-to-right.
 process_pcross - removes the line data from the "pcross" charater stroke.

 dominant_hori_line - chooses the most "dominant" solid or dashed
          horizontal line from the hough transform matrices passed.
 pick_max_pix_line - selects the most "dominant" solid horizontal line
          from the hough transform matrices passed.
 pick_dash_line - selects the most "dominant" dashed horizontal line
          from the the hough transform matrices passed.
 rm_long_hori_line - intelligently removes a long horizontal line from a
                     binary char image while preserving data that
                     intersects the line.
 rm_box_long_hori_sides - removes the relatively long top and bottom
                     sides of a box from within a binary char field image.
 rm_box_long_vert_sides - carefully removes the  left and right vertical
                     sides of a box from within a binary char field image.
 rm_box_short_vert_sides - removes the relatively short left and right vertical
                     sides of a box from within a binary char field image.
 next_n_run - determines the start and ending poinnts of the next contiguous
              run of elements in a list all equal to the specified value.
 stddev_run_widths - computes the stddev on the legnth of black and white runs
              along a given line trajectory through an 8-bit binary pixel image.
 slice_widths_hori_nb - traverses a predefined set of horizontal line points and
              locates the top and bottom of the intersecting vertical run of
              black pixels (slice).
 slice_width_hori - locates the top and bottom of a vertical run of contiguously
                    black pixels that overlap (or are very close) to the specified
                    starting point.
 erase_slices_hori_ml - erases vertical slices along a predefined set of horizontal
              line points based on a vector of locally dynamic median line widths.
 erase_slice_hori - erases the pixels along a specified vertical slice.

 draw_slice_hori - writes a given 8-bit pixel value along a specified vertical slice.

 erase_fuzzy_slices_hori_ml - erases vertical slices along a predefined set of
              of horizontal line points based on "fuzzy" line conditions.
 process_t_corner_slice - erases a portion of a slice for either a top-left
                          or top-right corner of line data based on a specifed
                          cut slope.
 process_b_corner_slice - erases a portion of a slice for either a bottom-left
                          or bottom-right corner of line data based on a specifed
                          cut slope.
 is_thru_dl - determines if the character piece passes through the line
           on its left side and touches the top of the line on its right side.
 process_thru_dl - removes the line data from the "thru_dl" charater stroke.

 is_thru_dr - determines if the character piece passes through the line
           on its right side and touches the top of the line on its left side.
 process_thru_dr - removes the line data from the "thru_dr" charater stroke.

 is_thru_ul - determines if the character piece passes through the line
           on its left side and touches the bottom of the line on its right side.
 process_thru_ul - removes the line data from the "thru_ul" charater stroke.

 is_thru_ur - determines if the character piece passes through the line
           on its right side and touches the bottom of the line on its left side.
 process_thru_ur - removes the line data from the "thru_ur" charater stroke.

 rm_tl_corner_1_sided - removes the top-left corner of line data
                using a slope projection from one side.
 rm_tl_corner_2_sided - removes the top-left corner of line data
                by projecting a cut line between two points.
 tl_corner_cut_slope - determines the slope for cutting off the
                top-left corner of line data.
 sum_dys_tl_corner - computes changes in y used to estimate the
                slope along which the top-left corner will be cut.
 rm_tr_corner_1_sided - removes the top-right corner of line data
                using a slope projection from one side.
 rm_tr_corner_2_sided - removes the top-right corner of line data
                by projecting a cut line between two points.
 tr_corner_cut_slope - determines the slope for cutting off the
                top-right corner of line data.
 sum_dys_tr_corner - computes changes in y used to estimate the
                slope along which the top-right corner will be cut.
 slope_left_above - determines the slope of the left side of a character
                    piece touching above the line.
 slope_left_below - determines the slope of the left side of a character
                    piece touching below the line.
 slope_right_above - determines the slope of the right side of a character
                     piece touching above the line.
 slope_right_below - determines the slope of the right side of a character
                     piece touching below the line.
 unerase_short_voids_ml - refills short voids between character pices based on one
               of the pieces abutting to the void with a slice width "close" to
               the locally dynamic median line width.
 unerase_curved_voids_ml - refills voids based on the intersection of slope
                trajectories using a vector of locally dynamic median line widths.
 join_nbrs_on_top - refills voids based on the intersection of slope trajectories
                    measured from 2 nbring character pieces sitting on top the line.
 join_nbrs_below - refills voids based on the intersection of slope trajectories
                   measured from 2 nbring character pieces touching along the bottom
                   of the line.
 right_vert_clear - checks if right edge is vertically clear of character data above
                    and below.
 left_vert_clear - checks if left edge is vertically clear of character data above
                   and below.
 top_left_hori_clear - checks if top-left edge is horizontally clear of character data.

 top_right_hori_clear - checks if top-right edge is horizontally clear of
                        character data.

 bottom_left_hori_clear - checks if bot-left edge is horizontally clear of
                          character data.
 bottom_right_hori_clear - checks if bot-right edge is horizontally clear of
                          character data.