136 lines
2.7 KiB
Go
136 lines
2.7 KiB
Go
package face_detection
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import (
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"log"
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"path/filepath"
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"sync"
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"github.com/Kagami/go-face"
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"github.com/photoview/photoview/api/graphql/models"
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"github.com/pkg/errors"
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"gorm.io/gorm"
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)
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type FaceDetector struct {
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mutex sync.Mutex
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db *gorm.DB
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rec *face.Recognizer
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samples []face.Descriptor
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cats []int32
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}
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var GlobalFaceDetector FaceDetector
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func InitializeFaceDetector(db *gorm.DB) error {
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log.Println("Initializing face detector")
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rec, err := face.NewRecognizer(filepath.Join("data", "models"))
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if err != nil {
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return errors.Wrap(err, "initialize facedetect recognizer")
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}
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samples, cats, err := getSamplesFromDatabase(db)
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if err != nil {
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return errors.Wrap(err, "get face detection samples from database")
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}
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GlobalFaceDetector = FaceDetector{
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db: db,
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rec: rec,
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samples: samples,
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cats: cats,
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}
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return nil
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}
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func getSamplesFromDatabase(db *gorm.DB) (samples []face.Descriptor, cats []int32, err error) {
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samples = make([]face.Descriptor, 0)
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cats = make([]int32, 0)
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return
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}
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func (fd *FaceDetector) DetectFaces(media *models.Media) error {
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if err := fd.db.Model(media).Preload("MediaURL").First(&media).Error; err != nil {
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return err
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}
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var thumbnailURL *models.MediaURL
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for _, url := range media.MediaURL {
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if url.Purpose == models.PhotoThumbnail {
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thumbnailURL = &url
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thumbnailURL.Media = media
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break
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}
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}
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if thumbnailURL == nil {
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return errors.New("thumbnail url is missing")
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}
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thumbnailPath, err := thumbnailURL.CachedPath()
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if err != nil {
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return err
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}
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fd.mutex.Lock()
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faces, err := fd.rec.RecognizeFile(thumbnailPath)
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fd.mutex.Unlock()
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if err != nil {
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return errors.Wrap(err, "error read faces")
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}
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for _, face := range faces {
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fd.classifyFace(&face, media)
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}
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return nil
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}
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func (fd *FaceDetector) classifyFace(face *face.Face, media *models.Media) error {
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fd.mutex.Lock()
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defer fd.mutex.Unlock()
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match := fd.rec.ClassifyThreshold(face.Descriptor, 0.2)
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imageFace := models.ImageFace{
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MediaID: media.ID,
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Descriptor: models.FaceDescriptor(face.Descriptor),
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}
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var faceGroup models.FaceGroup
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// If no match add it new to samples
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if match < 0 {
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log.Println("No match, assigning new face")
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faceGroup = models.FaceGroup{
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ImageFaces: []models.ImageFace{imageFace},
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}
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if err := fd.db.Create(&faceGroup).Error; err != nil {
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return err
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}
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} else {
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log.Println("Found match")
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if err := fd.db.First(&faceGroup, int(match)).Error; err != nil {
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return err
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}
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if err := fd.db.Model(&faceGroup).Association("ImageFaces").Append(&imageFace); err != nil {
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return err
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}
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}
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fd.samples = append(fd.samples, face.Descriptor)
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fd.cats = append(fd.cats, int32(faceGroup.ID))
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fd.rec.SetSamples(fd.samples, fd.cats)
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return nil
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}
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