Evaluation of electrocardiogram: numerical vs. image data for emotion recognition system. - Sharifah Noor Masidayu Sayed Ismail; Nor Azlina Bt Ab. Aziz; Siti Zainab Ibrahim; Sophan Wahyudi Nawawi; Salem Alelyani; Mohamed Mohana; Lee Chia Chun (F1000Research, 2021)