determined from several factors. One factor is the knowledge of the age of trees. Age of trees can be known through the circle of years on wood or also called growth. From the considerations above the formula issued is how to make a growth calculation system that is able to calculate by computer calculation, so we need an analysis to determine the age of the tree with growth. To support growth in wood one method that can be used is edge detection. The first stage in the process is grayscale which is done changing the RGB color image to gray, then the sobel edge detection process works to display the outline / edge of the image, then the calculation process is carried out with the formula.Keywords : image processing, annual ring, growthring, edge detection, sobelKualitas kayu yang baik dapat ditentukan dari beberapa faktor. Salah satu faktor itu adalah dengan mengetahui usia pohon. Usia pohon dapat diketahui berdasarkan lingkaran tahun pada kayu atau disebut juga dengan growthring. Dari permasalahan diatas rumusan masalahnya adalah bagaimana membuat sistem penghitungan growthring yang mampu menghitung dengan perhitungan komputer, maka diperlukan suatu analisis untuk mengetahui umur pohon dengan growthring. Untuk mendeteksi growthring pada kayu salah satu metode yang bisa digunakan adalah menggunakan edge detection. Tahapan yang pertama dilakukan proses dilakukan adalah proses grayscale yang dimana berfungsi mengubah gambar warna RGB menjadi abu abu, kemudian proses edge detection sobel yang berfungsi menampilkan garis tepi/tepian gambar, kemudian dilakukan proses perhitugan dengan rumus.Kata Kunci : pegolahan citra, lingkar tahun, growthring, edge detection, sobel
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