/*!
* \brief boxaSelectByWHRatio()
*
* \param[in] boxas
* \param[in] ratio width/height threshold value
* \param[in] relation L_SELECT_IF_LT, L_SELECT_IF_GT,
* L_SELECT_IF_LTE, L_SELECT_IF_GTE
* \param[out] pchanged [optional] 1 if changed; 0 if clone returned
* \return boxad filtered set, or NULL on error
*
* <pre>
* Notes:
* (1) Uses box copies in the new boxa.
* (2) To keep narrow components, use relation = L_SELECT_IF_LT or
* L_SELECT_IF_LTE.
* To keep wide components, use relation = L_SELECT_IF_GT or
* L_SELECT_IF_GTE.
* </pre>
*/
BOXA *
boxaSelectByWHRatio(BOXA *boxas,
l_float32 ratio,
l_int32 relation,
l_int32 *pchanged)
{
BOXA *boxad;
NUMA *na;
PROCNAME("boxaSelectByWHRatio");
if (pchanged) *pchanged = FALSE;
if (!boxas)
return (BOXA *)ERROR_PTR("boxas not defined", procName, NULL);
if (boxaGetCount(boxas) == 0) {
L_WARNING("boxas is empty\n", procName);
return boxaCopy(boxas, L_COPY);
}
if (relation != L_SELECT_IF_LT && relation != L_SELECT_IF_GT &&
relation != L_SELECT_IF_LTE && relation != L_SELECT_IF_GTE)
return (BOXA *)ERROR_PTR("invalid relation", procName, NULL);
/* Compute the indicator array for saving components */
na = boxaMakeWHRatioIndicator(boxas, ratio, relation);
/* Filter to get output */
boxad = boxaSelectWithIndicator(boxas, na, pchanged);
numaDestroy(&na);
return boxad;
}
/*!
* boxaSelectBySize()
*
* Input: boxas
* 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 if clone returned)
* Return: boxad (filtered set), or null on error
*
* Notes:
* (1) The args specify constraints on the size of the
* components that are kept.
* (2) Uses box clones in the new boxa.
* (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.
*/
BOXA *
boxaSelectBySize(BOXA *boxas,
l_int32 width,
l_int32 height,
l_int32 type,
l_int32 relation,
l_int32 *pchanged)
{
BOXA *boxad;
NUMA *na;
PROCNAME("boxaSelectBySize");
if (!boxas)
return (BOXA *)ERROR_PTR("boxas not defined", procName, NULL);
if (type != L_SELECT_WIDTH && type != L_SELECT_HEIGHT &&
type != L_SELECT_IF_EITHER && type != L_SELECT_IF_BOTH)
return (BOXA *)ERROR_PTR("invalid type", procName, NULL);
if (relation != L_SELECT_IF_LT && relation != L_SELECT_IF_GT &&
relation != L_SELECT_IF_LTE && relation != L_SELECT_IF_GTE)
return (BOXA *)ERROR_PTR("invalid relation", procName, NULL);
if (pchanged) *pchanged = FALSE;
/* Compute the indicator array for saving components */
na = boxaMakeSizeIndicator(boxas, width, height, type, relation);
/* Filter to get output */
boxad = boxaSelectWithIndicator(boxas, na, pchanged);
numaDestroy(&na);
return boxad;
}