File indexing completed on 2024-04-14 14:10:35

 /*
     SPDX-FileCopyrightText: 2004 Jasem Mutlaq
     SPDX-FileCopyrightText: 2020 Eric Dejouhanet <eric.dejouhanet@gmail.com>
 
     SPDX-License-Identifier: GPL-2.0-or-later
 
     Some code fragments were adapted from Peter Kirchgessner's FITS plugin
     SPDX-FileCopyrightText: Peter Kirchgessner <http://members.aol.com/pkirchg>
 */
 
 #ifndef FITSGRADIENTDETECTOR_H
 #define FITSGRADIENTDETECTOR_H
 
 #include "fitsstardetector.h"
 
 class FITSGradientDetector: public FITSStarDetector
 {
         Q_OBJECT
 
     public:
         explicit FITSGradientDetector(FITSData * data): FITSStarDetector(data) {};
 
     public:
         /** @brief Find sources in the parent FITS data file.
          * @see FITSStarDetector::findSources().
          */
         QFuture<bool> findSources(QRect const &boundary = QRect()) override;
 
     protected:
         /** @internal Find sources in the parent FITS data file, dependent of the pixel depth.
          * @see FITSGradientDetector::findSources.
          */
         template <typename T>
         bool findSources(const QRect &boundary);
 
         /** @internal Implementation of the Canny Edge detection (CannyEdgeDetector).
          * @copyright 2015 Gonzalo Exequiel Pedone (https://github.com/hipersayanX/CannyDetector).
          * @param data is the FITS data to run the detection onto.
          * @param gradient is the vector storing the amount of change in pixel sequences.
          * @param direction is the vector storing the four directions (horizontal, vertical and two diagonals) the changes stored in 'gradient' are detected in.
          */
         template <typename T>
         void sobel(FITSData const * data, QVector<float> &gradient, QVector<float> &direction) const;
 
         /** @internal Identify gradient connections.
          * @param width, height are the dimensions of the frame to work on.
          * @param gradient is the vector holding the amount of change in pixel sequences.
          * @param ids is the vector storing which gradient was identified for each pixel.
          */
         int partition(int width, int height, QVector<float> &gradient, QVector<int> &ids) const;
 
         /** @internal Trace gradient neighbors.
          * @param width, height are the dimensions of the frame to work on.
          * @param image is the image to work on, actually gradients extracted using the sobel algorithm.
          * @param ids is the vector storing which gradient was identified for each pixel.
          * @param x, y locate the pixel to trace from.
          */
         void trace(int width, int height, int id, QVector<float> &image, QVector<int> &ids, int x, int y) const;
 };
 
 #endif // FITSGRADIENTDETECTOR_H