/**
 * A configuration object for text recognition options.
 *
 * Text recognition settings need to be assigned (once) to scanning options via
 * [[ScanSettings.setTextRecognitionSettings]] and said modified [[ScanSettings]] (due to [[TextRecognitionSettings]]
 * changes) need to be applied to a scanner via [[BarcodePicker.applyScanSettings]] or [[Scanner.applyScanSettings]] to
 * take effect.
 */
export declare class TextRecognitionSettings {
    private readonly properties;
    private readonly recognizer;
    private regex?;
    private characterWhitelist?;
    private textDuplicateFilter;
    /**
     * @hidden
     *
     * @param recognizer <div class="tsd-signature-symbol">Default =&nbsp;"mrzFullScreen"</div>
     * The text recognition backend.
     */
    /**
     * @hidden Not functional for MRZ OCR
     *
     * @param characterWhitelist <div class="tsd-signature-symbol">Default =&nbsp;undefined</div>
     * The whitelist of recognizable characters. If the whitelist is defined and not empty, a recognition result will
     * never contain characters that are not included in the list.
     */
    /**
     * Create a TextRecognitionSettings instance.
     *
     * @param regex <div class="tsd-signature-symbol">Default =&nbsp;undefined</div>
     * The regular expression for filtering the recognized characters. Text that does not match the regular expression is
     * ignored. You must set a regex in order for text recognition to work.
     * @param textDuplicateFilter <div class="tsd-signature-symbol">Default =&nbsp;0</div>
     * The duplicate filter specifying how often a text can be scanned.
     * When the filter is set to -1, each unique text is only scanned once. When set to 0,
     * duplicate filtering is disabled. Otherwise the duplicate filter specifies an interval in milliseconds.
     * When the same text is scanned within the specified interval it is filtered out as a duplicate.
     */
    constructor({ 
    /**
     * @hidden
     */
    recognizer, regex, 
    /**
     * @hidden
     */
    characterWhitelist, textDuplicateFilter, }?: {
        /**
         * @hidden
         */
        recognizer?: string;
        regex?: string | RegExp;
        /**
         * @hidden
         */
        characterWhitelist?: string;
        textDuplicateFilter?: number;
    });
    /**
     * @returns The configuration object as a JSON string.
     */
    toJSONString(): string;
    /**
     * Get the regular expression for filtering the recognized characters.
     *
     * By default, no regex is set. You must set a regex in order for text recognition to work.
     *
     * @returns The regular expression.
     */
    getRegex(): string | undefined;
    /**
     * Set the regular expression for filtering the recognized characters.
     *
     * Text that does not match the regular expression is ignored.
     *
     * Using a regex with a capture group will make results contain only the text matching the capture group. To return
     * the full text matching the regex, use a non-capturing group.
     *
     * By default, no regex is set. You must set a regex in order for text recognition to work.
     *
     * @param regex The new regular expression.
     * @returns The updated [[TextRecognitionSettings]] object.
     */
    setRegex(regex?: string | RegExp): TextRecognitionSettings;
    /**
     * @hidden Not functional for MRZ OCR
     *
     * Get the whitelist of recognizable characters.
     *
     * By default there is no whitelist and all characters will be recognized.
     *
     * @returns The character whitelist.
     */
    getCharacterWhitelist(): string | undefined;
    /**
     * @hidden Not functional for MRZ OCR
     *
     * Set the whitelist of recognizable characters.
     *
     * If the whitelist is defined and not empty, a recognition result will never contain characters that are not included
     * in the list.
     *
     * By default there is no whitelist and all characters will be recognized.
     *
     * @param characterWhitelist The new character whitelist.
     * @returns The updated [[TextRecognitionSettings]] object.
     */
    setCharacterWhitelist(characterWhitelist?: string): TextRecognitionSettings;
    /**
     * Get the text duplicate filter value.
     *
     * By default duplicate filtering is disabled.
     *
     * @returns The text duplicate filter value.
     */
    getTextDuplicateFilter(): number;
    /**
     * Set the text duplicate filter value.
     *
     * When the filter is set to -1, each unique text is only scanned once. When set to 0,
     * duplicate filtering is disabled. Otherwise the duplicate filter specifies an interval in milliseconds.
     *
     * By default duplicate filtering is disabled.
     *
     * @param durationMilliseconds The new value (-1, 0, or positive integer).
     * @returns The updated [[TextRecognitionSettings]] object.
     */
    setTextDuplicateFilter(durationMilliseconds: number): TextRecognitionSettings;
    /**
     * Get a Scandit Data Capture library text recognition property.
     *
     * This function is for internal use only and any functionality that can be accessed through it can and will vanish
     * without public notice from one version to the next. Do not call this function unless you specifically have to.
     *
     * @param key The property name.
     * @returns The property value. For properties not previously set, -1 is returned.
     */
    getProperty(key: string): number;
    /**
     * Set a Scandit Data Capture library text recognition property.
     *
     * This function is for internal use only and any functionality that can be accessed through it can and will vanish
     * without public notice from one version to the next. Do not call this function unless you specifically have to.
     *
     * @param key The property name.
     * @param value The property value.
     * @returns The updated [[TextRecognitionSettings]] object.
     */
    setProperty(key: string, value: number): TextRecognitionSettings;
}