Leptonica 1.54
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PIXA* pixaAddBorderGeneral | ( | PIXA * | pixad, |
PIXA * | pixas, | ||
l_int32 | left, | ||
l_int32 | right, | ||
l_int32 | top, | ||
l_int32 | bot, | ||
l_uint32 | val | ||
) |
Input: pixad (can be null or equal to pixas) pixas (containing pix of all depths; colormap ok) left, right, top, bot (number of pixels added) val (value of added border pixels) Return: pixad (with border added to each pix), including on error
Notes: (1) For binary images: white: val = 0 black: val = 1 For grayscale images: white: val = 2 ** d - 1 black: val = 0 For rgb color images: white: val = 0xffffff00 black: val = 0 For colormapped images, use 'index' found this way: white: pixcmapGetRankIntensity(cmap, 1.0, &index); black: pixcmapGetRankIntensity(cmap, 0.0, &index); (2) For in-place replacement of each pix with a bordered version, use = . To make a new pixa, use = NULL. (3) In both cases, the boxa has sides adjusted as if it were expanded by the border.
Input: pixaa &naindex (<optional return>=""> the pixa index in the pixaa) copyflag (L_COPY or L_CLONE) Return: pixa, or null on error
Notes: (1) This 'flattens' the pixaa to a pixa, taking the pix in order in the first pixa, then the second, etc. (2) If &naindex is defined, we generate a Numa that gives, for each pix in the pixaa, the index of the pixa to which it belongs.
Input: pixa &hascmap (<return> 1 if any pix has a colormap; 0 otherwise) Return: 0 if OK; 1 on error
PIXA* pixaBinSort | ( | PIXA * | pixas, |
l_int32 | sorttype, | ||
l_int32 | sortorder, | ||
NUMA ** | pnaindex, | ||
l_int32 | copyflag | ||
) |
Input: pixas sorttype (L_SORT_BY_X, L_SORT_BY_Y, L_SORT_BY_WIDTH, L_SORT_BY_HEIGHT, L_SORT_BY_PERIMETER) sortorder (L_SORT_INCREASING, L_SORT_DECREASING) &naindex (<optional return>=""> index of sorted order into original array) copyflag (L_COPY, L_CLONE) Return: pixad (sorted version of pixas), or null on error
Notes: (1) This sorts based on the data in the boxa. If the boxa count is not the same as the pixa count, this returns an error. (2) The copyflag refers to the pix and box copies that are inserted into the sorted pixa. These are either L_COPY or L_CLONE. (3) For a large number of boxes (say, greater than 1000), this O(n) binsort is much faster than the O(nlogn) shellsort. For 5000 components, this is over 20x faster than boxaSort(). (4) Consequently, pixaSort() calls this function if it will likely go much faster.
Input: pixas pixs Return: pixad, or null on error
Notes: (1) This is intended for use in situations where pixas was originally generated from the input pixs. (2) Returns a pixad where each pix in pixas is ANDed with its associated region of the input pixs. This region is specified by the the box that is associated with the pix. (3) In a typical application of this function, pixas has a set of region masks, so this generates a pixa of the parts of pixs that correspond to each region mask component, along with the bounding box for the region.
Input: pixs (1 bpp pix from which components are added; in-place) pixa (of connected components, some of which will be put into pixs) na (numa indicator: add components corresponding to 1s) Return: 0 if OK, 1 on error
Notes: (1) This complements pixRemoveWithIndicator(). Here, the selected components are added to pixs.
l_int32 pixaEqual | ( | PIXA * | pixa1, |
PIXA * | pixa2, | ||
l_int32 | maxdist, | ||
NUMA ** | pnaindex, | ||
l_int32 * | psame | ||
) |
Input: pixa1 pixa2 maxdist &naindex (<optional return>=""> index array of correspondences &same (<return> 1 if equal; 0 otherwise) Return 0 if OK, 1 on error
Notes: (1) The two pixa are the "same" if they contain the same boxa and the same ordered set of pix. However, if they have boxa, the pix in each pixa can differ in ordering by an amount given by the parameter . If they don't have a boxa, the parameter is ignored, and the ordering must be identical. (2) This applies only to boxa geometry, pixels and ordering; other fields in the pix are ignored. (3) naindex[i] gives the position of the box in pixa2 that corresponds to box i in pixa1. It is only returned if the pixa have boxa and the boxa are equal. (4) In situations where the ordering is very different, so that a large is required for "equality", this should be implemented with a hash function for efficiency.
Input: pixa &maxdepth (<optional return>=""> max pixel depth of pix in pixa) &same (<optional return>=""> true if all depths are equal) Return: 0 if OK; 1 on error
Input: pixas thresh (threshold ratio of fg pixels to (w * h)) type (L_SELECT_IF_LT, L_SELECT_IF_GT, L_SELECT_IF_LTE, L_SELECT_IF_GTE) &changed (<optional return>=""> 1 if changed; 0 if clone returned) Return: pixad, or null on error
Notes: (1) Returns a pixa clone if no components are removed. (2) Uses pix and box clones in the new pixa. (3) This filters components based on the fraction of fg pixels of the component in its bounding box. (4) Use L_SELECT_IF_LT or L_SELECT_IF_LTE to save components with less than the threshold fraction of foreground, and L_SELECT_IF_GT or L_SELECT_IF_GTE to remove them.
PIXA* pixaSelectByAreaPerimRatio | ( | PIXA * | pixas, |
l_float32 | thresh, | ||
l_int32 | type, | ||
l_int32 * | pchanged | ||
) |
Input: pixas thresh (threshold ratio of interior/boundary pixels) type (L_SELECT_IF_LT, L_SELECT_IF_GT, L_SELECT_IF_LTE, L_SELECT_IF_GTE) &changed (<optional return>=""> 1 if changed; 0 if clone returned) Return: pixad, or null on error
Notes: (1) Returns a pixa clone if no components are removed. (2) Uses pix and box clones in the new pixa. (3) We define a thin component here to be one with a ratio of interior to boundary pixels that is smaller than a given threshold value. (4) Use L_SELECT_IF_LT or L_SELECT_IF_LTE to save the thin components, and L_SELECT_IF_GT or L_SELECT_IF_GTE to remove them.
PIXA* pixaSelectBySize | ( | PIXA * | pixas, |
l_int32 | width, | ||
l_int32 | height, | ||
l_int32 | type, | ||
l_int32 | relation, | ||
l_int32 * | pchanged | ||
) |
Input: pixas width, height (threshold dimensions) type (L_SELECT_WIDTH, L_SELECT_HEIGHT, L_SELECT_IF_EITHER, L_SELECT_IF_BOTH) relation (L_SELECT_IF_LT, L_SELECT_IF_GT, L_SELECT_IF_LTE, L_SELECT_IF_GTE) &changed (<optional return>=""> 1 if changed; 0 otherwise) Return: pixad, or null on error
Notes: (1) The args specify constraints on the size of the components that are kept. (2) Uses pix and box clones in the new pixa. (3) If the selection type is L_SELECT_WIDTH, the input height is ignored, and v.v. (4) To keep small components, use relation = L_SELECT_IF_LT or L_SELECT_IF_LTE. To keep large components, use relation = L_SELECT_IF_GT or L_SELECT_IF_GTE.
PIXA* pixaSelectByWidthHeightRatio | ( | PIXA * | pixas, |
l_float32 | thresh, | ||
l_int32 | type, | ||
l_int32 * | pchanged | ||
) |
pixaSelectByWidthHeightRatio()
Input: pixas thresh (threshold ratio of width/height) type (L_SELECT_IF_LT, L_SELECT_IF_GT, L_SELECT_IF_LTE, L_SELECT_IF_GTE) &changed (<optional return>=""> 1 if changed; 0 if clone returned) Return: pixad, or null on error
Notes: (1) Returns a pixa clone if no components are removed. (2) Uses pix and box clones in the new pixa. (3) This filters components based on the width-to-height ratio of each pix. (4) Use L_SELECT_IF_LT or L_SELECT_IF_LTE to save components with less than the threshold ratio, and L_SELECT_IF_GT or L_SELECT_IF_GTE to remove them.
Input: pixas na (indicator numa) &changed (<optional return>=""> 1 if changed; 0 if clone returned) Return: pixad, or null on error
Notes: (1) Returns a pixa clone if no components are removed. (2) Uses pix and box clones in the new pixa. (3) The indicator numa has values 0 (ignore) and 1 (accept).
l_int32 pixaSizeRange | ( | PIXA * | pixa, |
l_int32 * | pminw, | ||
l_int32 * | pminh, | ||
l_int32 * | pmaxw, | ||
l_int32 * | pmaxh | ||
) |
Input: pixa &minw, &minh, &maxw, &maxh (<optional return>=""> range of dimensions of pix in the array) Return: 0 if OK, 1 on error
PIXA* pixaSort | ( | PIXA * | pixas, |
l_int32 | sorttype, | ||
l_int32 | sortorder, | ||
NUMA ** | pnaindex, | ||
l_int32 | copyflag | ||
) |
Input: pixas sorttype (L_SORT_BY_X, L_SORT_BY_Y, L_SORT_BY_WIDTH, L_SORT_BY_HEIGHT, L_SORT_BY_MIN_DIMENSION, L_SORT_BY_MAX_DIMENSION, L_SORT_BY_PERIMETER, L_SORT_BY_AREA, L_SORT_BY_ASPECT_RATIO) sortorder (L_SORT_INCREASING, L_SORT_DECREASING) &naindex (<optional return>=""> index of sorted order into original array) copyflag (L_COPY, L_CLONE) Return: pixad (sorted version of pixas), or null on error
Notes: (1) This sorts based on the data in the boxa. If the boxa count is not the same as the pixa count, this returns an error. (2) The copyflag refers to the pix and box copies that are inserted into the sorted pixa. These are either L_COPY or L_CLONE.
Input: pixas naa (numaa that maps from the new pixaa to the input pixas) copyflag (L_CLONE or L_COPY) Return: pixaa (sorted), or null on error
Input: pixas naindex (na that maps from the new pixa to the input pixa) copyflag (L_COPY, L_CLONE) Return: pixad (sorted), or null on error
Input: pixs (1 bpp pix from which components are removed; in-place) pixa (of connected components in pixs) na (numa indicator: remove components corresponding to 1s) Return: 0 if OK, 1 on error
Notes: (1) This complements pixAddWithIndicator(). Here, the selected components are set subtracted from pixs.
PIX* pixSelectByAreaFraction | ( | PIX * | pixs, |
l_float32 | thresh, | ||
l_int32 | connectivity, | ||
l_int32 | type, | ||
l_int32 * | pchanged | ||
) |
Input: pixs (1 bpp) thresh (threshold ratio of fg pixels to (w * h)) connectivity (4 or 8) type (L_SELECT_IF_LT, L_SELECT_IF_GT, L_SELECT_IF_LTE, L_SELECT_IF_GTE) &changed (<optional return>=""> 1 if changed; 0 if clone returned) Return: pixd, or null on error
Notes: (1) The args specify constraints on the amount of foreground coverage of the components that are kept. (2) If unchanged, returns a copy of pixs. Otherwise, returns a new pix with the filtered components. (3) This filters components based on the fraction of fg pixels of the component in its bounding box. (4) Use L_SELECT_IF_LT or L_SELECT_IF_LTE to save components with less than the threshold fraction of foreground, and L_SELECT_IF_GT or L_SELECT_IF_GTE to remove them.
PIX* pixSelectByAreaPerimRatio | ( | PIX * | pixs, |
l_float32 | thresh, | ||
l_int32 | connectivity, | ||
l_int32 | type, | ||
l_int32 * | pchanged | ||
) |
Input: pixs (1 bpp) thresh (threshold ratio of interior/boundary pixels) connectivity (4 or 8) type (L_SELECT_IF_LT, L_SELECT_IF_GT, L_SELECT_IF_LTE, L_SELECT_IF_GTE) &changed (<optional return>=""> 1 if changed; 0 if clone returned) Return: pixd, or null on error
Notes: (1) The args specify constraints on the size of the components that are kept. (2) If unchanged, returns a copy of pixs. Otherwise, returns a new pix with the filtered components. (3) This filters "thin" components, where a thin component is defined to have a ratio of interior to boundary pixels that is smaller than a given threshold value. (4) Use L_SELECT_IF_LT or L_SELECT_IF_LTE to save the thin components, and L_SELECT_IF_GT or L_SELECT_IF_GTE to remove them.
PIX* pixSelectBySize | ( | PIX * | pixs, |
l_int32 | width, | ||
l_int32 | height, | ||
l_int32 | connectivity, | ||
l_int32 | type, | ||
l_int32 | relation, | ||
l_int32 * | pchanged | ||
) |
Input: pixs (1 bpp) width, height (threshold dimensions) connectivity (4 or 8) type (L_SELECT_WIDTH, L_SELECT_HEIGHT, L_SELECT_IF_EITHER, L_SELECT_IF_BOTH) relation (L_SELECT_IF_LT, L_SELECT_IF_GT, L_SELECT_IF_LTE, L_SELECT_IF_GTE) &changed (<optional return>=""> 1 if changed; 0 otherwise) Return: filtered pixd, or null on error
Notes: (1) The args specify constraints on the size of the components that are kept. (2) If unchanged, returns a copy of pixs. Otherwise, returns a new pix with the filtered components. (3) If the selection type is L_SELECT_WIDTH, the input height is ignored, and v.v. (4) To keep small components, use relation = L_SELECT_IF_LT or L_SELECT_IF_LTE. To keep large components, use relation = L_SELECT_IF_GT or L_SELECT_IF_GTE.
PIX* pixSelectByWidthHeightRatio | ( | PIX * | pixs, |
l_float32 | thresh, | ||
l_int32 | connectivity, | ||
l_int32 | type, | ||
l_int32 * | pchanged | ||
) |
Input: pixs (1 bpp) thresh (threshold ratio of width/height) connectivity (4 or 8) type (L_SELECT_IF_LT, L_SELECT_IF_GT, L_SELECT_IF_LTE, L_SELECT_IF_GTE) &changed (<optional return>=""> 1 if changed; 0 if clone returned) Return: pixd, or null on error
Notes: (1) The args specify constraints on the width-to-height ratio for components that are kept. (2) If unchanged, returns a copy of pixs. Otherwise, returns a new pix with the filtered components. (3) This filters components based on the width-to-height ratios. (4) Use L_SELECT_IF_LT or L_SELECT_IF_LTE to save components with less than the threshold ratio, and L_SELECT_IF_GT or L_SELECT_IF_GTE to remove them.
const l_int32 MIN_COMPS_FOR_BIN_SORT = 500 [static] |