Linear Operation to Quality Improvement Coal Image Using Contrast Stretching and Sobel

Muh. Yusuf (a:1:{s:5:"en_US"s:45:"Universitas Pejuang Republik Indonesia (UPRI)"})
Hasni Kasim (Universitas Pejuang Republik Indonesia (UPRI))
Haslinda Haslinda (Universitas Pejuang Republik Indonesia (UPRI))
Rachmat Rachmat (Universitas Pejuang Republik Indonesia (UPRI))
Muh. Fahmi Basmar (Universitas Pejuang Republik Indonesia (UPRI))

Journal of Social Research
Vol. 2 No. 5 (2023): Journal of Social Research

This linear operation is one way to improve image quality using contrast stretching and sobel methods. The processed image has a higher contrast value so that it can produce new information. This study aims to apply the contrast stretching method to improve the quality of coal images in JPEG format. Based on the test results, the average value of coal variance has increased. This result proves that contrast stretching causes the spread of RGB values to be even. The even distribution of RGB values causes the coal image to have better contrast than the original image before the repair. Where the results of the study found that the quality of coal was obtained based on the level of calorie content contained in coal, the smaller the calorie content, the quality of the stone was very good