@webarkit/jsfeat-next/dist/src/fast_corners/fast_private.js

Typescript version of jsfeat for WebARKit

export function _cmp_score_16(src, off, pixel, d, threshold) {
    let N = 25, k = 0, v = src[off];
    let a0 = threshold, a = 0, b0 = 0, b = 0;
    for (; k < N; ++k) {
        d[k] = v - src[off + pixel[k]];
    }
    for (k = 0; k < 16; k += 2) {
        a = Math.min(d[k + 1], d[k + 2]);
        a = Math.min(a, d[k + 3]);
        if (a <= a0)
            continue;
        a = Math.min(a, d[k + 4]);
        a = Math.min(a, d[k + 5]);
        a = Math.min(a, d[k + 6]);
        a = Math.min(a, d[k + 7]);
        a = Math.min(a, d[k + 8]);
        a0 = Math.max(a0, Math.min(a, d[k]));
        a0 = Math.max(a0, Math.min(a, d[k + 9]));
    }
    b0 = -a0;
    for (k = 0; k < 16; k += 2) {
        b = Math.max(d[k + 1], d[k + 2]);
        b = Math.max(b, d[k + 3]);
        b = Math.max(b, d[k + 4]);
        b = Math.max(b, d[k + 5]);
        if (b >= b0)
            continue;
        b = Math.max(b, d[k + 6]);
        b = Math.max(b, d[k + 7]);
        b = Math.max(b, d[k + 8]);
        b0 = Math.min(b0, Math.max(b, d[k]));
        b0 = Math.min(b0, Math.max(b, d[k + 9]));
    }
    return -b0 - 1;
}
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