import type { Tensor } from "onnxruntime-common";
/** CTC blank token index. */
export declare const BLANK_INDEX = 0;
/** Unknown token marker used in PaddleOCR dictionaries. */
export declare const UNK_TOKEN = "<unk>";
/** Minimum crop width (pixels) fed to the recognition model. */
export declare const MIN_CROP_WIDTH = 8;
/**
 * Performs greedy CTC decoding over raw model logits.
 *
 * Hot loop: argmax and character handling are inlined, and per-character
 * confidence is accumulated as a running sum instead of a backing array.
 */
export declare function ctcGreedyDecode(logits: Float32Array, sequenceLength: number, numClasses: number, charDict: string[]): {
    text: string;
    confidence: number;
};
/**
 * Decodes an ONNX output tensor into text using the supplied character dictionary.
 *
 * Prepends a blank slot when the dict is one entry shorter than the model's class count
 * (issue #15 compatibility).
 *
 * When `verbose` is set, a dictionary/model size mismatch is reported once (such a
 * mismatch produces garbage output, so it usually signals the wrong dictionary).
 */
export declare function decodeResults(outputTensor: Tensor, charactersDictionary: string[], numClassesFromShape: number, verbose?: boolean): {
    text: string;
    confidence: number;
};