enc_dot_dictionary.cc

// Copyright (c) the JPEG XL Project Authors. All rights reserved.

//

// Use of this source code is governed by a BSD-style

// license that can be found in the LICENSE file.

#include "lib/jxl/enc_dot_dictionary.h"

#include <array>

#include <cstddef>

#include <cstring>

#include "lib/jxl/base/override.h"

#include "lib/jxl/base/rect.h"

#include "lib/jxl/base/status.h"

#include "lib/jxl/chroma_from_luma.h"

#include "lib/jxl/enc_detect_dots.h"

#include "lib/jxl/enc_params.h"

#include "lib/jxl/image.h"

namespace jxl {

// Private implementation of Dictionary Encode/Decode

namespace {

/* Quantization constants for Ellipse dots */

const size_t kEllipsePosQ = 2;        // Quantization level for the position

const double kEllipseMinSigma = 0.1;  // Minimum sigma value

const double kEllipseMaxSigma = 3.1;  // Maximum Sigma value

const size_t kEllipseSigmaQ = 16;     // Number of quantization levels for sigma

const size_t kEllipseAngleQ = 8;      // Quantization level for the angle

// TODO(user): fix these values.

const std::array<double, 3> kEllipseMinIntensity{{-0.05, 0.0, -0.5}};

const std::array<double, 3> kEllipseMaxIntensity{{0.05, 1.0, 0.4}};

const std::array<size_t, 3> kEllipseIntensityQ{{10, 36, 10}};

}  // namespace

StatusOr<std::vector<PatchInfo>> FindDotDictionary(

    const CompressParams& cparams, const Image3F& opsin, const Rect& rect,

    const ColorCorrelation& color_correlation, ThreadPool* pool) {

  if (ApplyOverride(cparams.dots,

                    cparams.butteraugli_distance >= kMinButteraugliForDots)) {

    GaussianDetectParams ellipse_params;

    ellipse_params.t_high = 0.04;

    ellipse_params.t_low = 0.02;

    ellipse_params.maxWinSize = 5;

    ellipse_params.maxL2Loss = 0.005;

    ellipse_params.maxCustomLoss = 300;

    ellipse_params.minIntensity = 0.12;

    ellipse_params.maxDistMeanMode = 1.0;

    ellipse_params.maxNegPixels = 0;

    ellipse_params.minScore = 12.0;

    ellipse_params.maxCC = 100;

    ellipse_params.percCC = 100;

    EllipseQuantParams qParams{rect.xsize(),

                               rect.ysize(),

                               kEllipsePosQ,

                               kEllipseMinSigma,

                               kEllipseMaxSigma,

                               kEllipseSigmaQ,

                               kEllipseAngleQ,

                               kEllipseMinIntensity,

                               kEllipseMaxIntensity,

                               kEllipseIntensityQ,

                               kEllipsePosQ <= 5,

                               color_correlation.YtoXRatio(0),

                               color_correlation.YtoBRatio(0)};

    return DetectGaussianEllipses(opsin, rect, ellipse_params, qParams, pool);

  std::vector<PatchInfo> nothing;

  return nothing;

}  // namespace jxl