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Diffstat (limited to 'src/image/ocr.c')
| -rw-r--r-- | src/image/ocr.c | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/src/image/ocr.c b/src/image/ocr.c new file mode 100644 index 0000000..4f6d3de --- /dev/null +++ b/src/image/ocr.c @@ -0,0 +1,145 @@ +/****************************************************************************** + * Copyright (C) 2018 Alejandro Colomar Andrés * + * SPDX-License-Identifier: GPL-2.0-only * + ******************************************************************************/ + + +/****************************************************************************** + ******* headers ************************************************************** + ******************************************************************************/ +#include "vision-artificial/image/ocr.h" + +#include <limits.h> +#include <stddef.h> +#include <stdio.h> + +#include <tesseract/capi.h> + +#include "vision-artificial/about/about.h" +#include "vision-artificial/image/iface.h" + + +/****************************************************************************** + ******* macros *************************************************************** + ******************************************************************************/ + + +/****************************************************************************** + ******* enums **************************************************************** + ******************************************************************************/ + + +/****************************************************************************** + ******* structs / unions ***************************************************** + ******************************************************************************/ + + +/****************************************************************************** + ******* variables ************************************************************ + ******************************************************************************/ + + +/****************************************************************************** + ******* static functions (prototypes) **************************************** + ******************************************************************************/ +static void img_ocr_read (const void *data); + + +/****************************************************************************** + ******* global functions ***************************************************** + ******************************************************************************/ +void img_ocr_act (int action, const void *data) +{ + + switch (action) { + case IMG_OCR_ACT_READ: + img_ocr_read(data); + break; + } +} + + +/****************************************************************************** + ******* static functions (definitions) *************************************** + ******************************************************************************/ +static void img_ocr_read (const void *data) +{ + const struct Img_Iface_Data_Read *data_cast; + struct TessBaseAPI *handle_ocr; + int lang; + char lang_str[FILENAME_MAX]; + int conf; + char conf_str[FILENAME_MAX]; + char *txt; + + /* Data */ + data_cast = (const struct Img_Iface_Data_Read *)data; + + /* Language */ + lang = data_cast->lang; + switch (lang) { + case IMG_IFACE_OCR_LANG_ENG: + sprintf(lang_str, "eng"); + break; + case IMG_IFACE_OCR_LANG_SPA: + sprintf(lang_str, "spa"); + break; + case IMG_IFACE_OCR_LANG_CAT: + sprintf(lang_str, "cat"); + break; + case IMG_IFACE_OCR_LANG_DIGITS: + sprintf(lang_str, "digits"); + break; + case IMG_IFACE_OCR_LANG_DIGITS_COMMA: + sprintf(lang_str, "digits_comma"); + break; + } + + /* Config file */ + conf = data_cast->conf; + switch (conf) { + case IMG_IFACE_OCR_CONF_PRICE: + if (snprintf(conf_str, FILENAME_MAX, "%s/%s", + share_path, + "price") >= FILENAME_MAX) { + printf("Path is too large and has been truncated\n"); + printf("Price configuration was not possible!\n"); + conf = IMG_IFACE_OCR_CONF_NONE; + } + break; + } + + /* init OCR */ + handle_ocr = TessBaseAPICreate(); +#if defined(OEM_LSTM_ONLY) + TessBaseAPIInit2(handle_ocr, NULL, lang_str, OEM_LSTM_ONLY); +#else + TessBaseAPIInit2(handle_ocr, NULL, lang_str, OEM_DEFAULT); +#endif +/* TessBaseAPIInit2(handle_ocr, NULL, lang_str, OEM_TESSERACT_LSTM_COMBINED);*/ + + /* Configure OCR (whitelist chars) */ + if (conf) + TessBaseAPIReadConfigFile(handle_ocr, conf_str); + + /* scan image for text */ + TessBaseAPISetImage(handle_ocr, data_cast->img.data, + data_cast->img.width, data_cast->img.height, + data_cast->img.B_per_pix, + data_cast->img.B_per_line); + TessBaseAPIRecognize(handle_ocr, NULL); + txt = TessBaseAPIGetUTF8Text(handle_ocr); + + /* Copy text to global variable */ + snprintf(img_ocr_text, OCR_TEXT_MAX, "%s", txt); + + /* cleanup */ + TessDeleteText(txt); + TessBaseAPIEnd(handle_ocr); + TessBaseAPIDelete(handle_ocr); +} + + +/****************************************************************************** + ******* end of file ********************************************************** + ******************************************************************************/ |