otiai10/gosseract

package gosseract

// PageSegMode represents tesseract::PageSegMode.
// See https://github.com/tesseract-ocr/tesseract/wiki/ImproveQuality#page-segmentation-method and
// https://github.com/tesseract-ocr/tesseract/blob/a18620cfea33d03032b71fe1b9fc424777e34252/ccstruct/publictypes.h#L158-L183 for more information.
type PageSegMode int

const (
    // PSM_OSD_ONLY - Orientation and script detection (OSD) only.
    PSM_OSD_ONLY PageSegMode = iota
    // PSM_AUTO_OSD - Automatic page segmentation with OSD.
    PSM_AUTO_OSD
    // PSM_AUTO_ONLY - Automatic page segmentation, but no OSD, or OCR.
    PSM_AUTO_ONLY
    // PSM_AUTO - (DEFAULT) Fully automatic page segmentation, but no OSD.
    PSM_AUTO
    // PSM_SINGLE_COLUMN - Assume a single column of text of variable sizes.
    PSM_SINGLE_COLUMN
    // PSM_SINGLE_BLOCK_VERT_TEXT - Assume a single uniform block of vertically aligned text.
    PSM_SINGLE_BLOCK_VERT_TEXT
    // PSM_SINGLE_BLOCK - Assume a single uniform block of text.
    PSM_SINGLE_BLOCK
    // PSM_SINGLE_LINE - Treat the image as a single text line.
    PSM_SINGLE_LINE
    // PSM_SINGLE_WORD - Treat the image as a single word.
    PSM_SINGLE_WORD
    // PSM_CIRCLE_WORD - Treat the image as a single word in a circle.
    PSM_CIRCLE_WORD
    // PSM_SINGLE_CHAR - Treat the image as a single character.
    PSM_SINGLE_CHAR
    // PSM_SPARSE_TEXT - Find as much text as possible in no particular order.
    PSM_SPARSE_TEXT
    // PSM_SPARSE_TEXT_OSD - Sparse text with orientation and script det.
    PSM_SPARSE_TEXT_OSD
    // PSM_RAW_LINE - Treat the image as a single text line, bypassing hacks that are Tesseract-specific.
    PSM_RAW_LINE

    // PSM_COUNT - Just a number of enum entries. This is NOT a member of PSM ;)
    PSM_COUNT
)

// PageIteratorLevel maps directly to tesseracts enum tesseract::PageIteratorLevel
// represents the hierarchy of the page elements used in ResultIterator.
// https://github.com/tesseract-ocr/tesseract/blob/a18620cfea33d03032b71fe1b9fc424777e34252/ccstruct/publictypes.h#L219-L225
type PageIteratorLevel int

const (
    // RIL_BLOCK - Block of text/image/separator line.
    RIL_BLOCK PageIteratorLevel = iota
    // RIL_PARA - Paragraph within a block.
    RIL_PARA
    // RIL_TEXTLINE - Line within a paragraph.
    RIL_TEXTLINE
    // RIL_WORD - Word within a textline.
    RIL_WORD
    // RIL_SYMBOL - Symbol/character within a word.
    RIL_SYMBOL
)

// SettableVariable represents available strings for TessBaseAPI::SetVariable.
// See https://groups.google.com/forum/#!topic/tesseract-ocr/eHTBzrBiwvQ
// and https://github.com/tesseract-ocr/tesseract/blob/master/src/ccmain/tesseractclass.h
type SettableVariable string

// Followings are variables which can be used for TessBaseAPI::SetVariable.
// If anything missing (I know there are many), please add one below.
const (
    // DEBUG_FILE - File to send output to.
    DEBUG_FILE SettableVariable = "debug_file"
    // TESSEDIT_CHAR_WHITELIST - Whitelist of chars to recognize
    // There is a known issue in 4.00 with LSTM
    // https://github.com/tesseract-ocr/tesseract/issues/751
    TESSEDIT_CHAR_WHITELIST SettableVariable = "tessedit_char_whitelist"
    // TESSEDIT_CHAR_BLACKLIST - Blacklist of chars not to recognize
    // There is a known issue in 4.00 with LSTM
    // https://github.com/tesseract-ocr/tesseract/issues/751
    TESSEDIT_CHAR_BLACKLIST SettableVariable = "tessedit_char_blacklist"
)