Akusisi citra digital malaria dapat menghasilkan citra dengan kontras rendah. Hal ini dapat disebabkan karena pengaturan pencahayaan pada mikroskop yang rendah dan penyesuaian parameter pada image capturing software yang tidak tepat. Citra malaria dengan kontras rendah dapat menjadikan segmentasi eritrosit dan plasmodium dari background menjadi tidak akurat. Segmentasi yang tidak akurat juga berdampak terhadap proses ekstraksi fitur dan klasifikasi pada sistem diagnosis malaria otomatis. Oleh karena itu, diperlukan contrast enhancement pada tahap pra pemrosesan untuk menghasilkan citra dengan kualitas yang baik. Pada penelitian ini, kinerja metode contrast enhancement berbasis histogram, yaitu Histogram Equalization (HE), Adapative Histogram Equalization (AHE), dan Contrast Limited Adaptive Histogram Equalization (CLAHE) diuji pada citra malaria untuk mengetahui metode yang menghasilkan citra dengan kualitas terbaik. Hasil pengujian pada dataset MP-IBD, metode CLAHE memberikan hasil yang terbaik dengan nilai MSE 482,35 dan PSNR 21,62. Perbaikan kontras menggunakan CLAHE dapat menghasilkan citra dengan visual eritrosit dan plasmodium yang lebih jelas dan noise yang minimal.

The British people introduced their language to the Americans when they reached and occupied the lands of the indigenous people by sea between the 16th and 17th centuries. The British ways of communication and mass media played a very significant role in affecting dialect differences and modifying pronunciation and vocabulary into English standards, known as the received pronunciation (RP). This study is aimed to identify: (1) the students’ perception towards British accents in speaking class and (2) the particular impacts of the accents on students’ dialects when used in a classroom. This research applied a mixed-method, the sequential explanatory with the advanced quantitative (explanatory) and then a qualitative. In other words, the results of this research are made ​​in the form of quantitative data and supported by qualitative data in the form of narrative depth. The participants were non-English students who had a less understanding of British accents. To collect data, observations on some of the participants’ documents (archives, photographs, and field notes) and questionnaire, followed by in-depth interviews with the students. Furthermore, to get the validity of its findings, the triangulation validity of the data is discussed with researchers and colleagues who understand the areas studied. British Accents are expected to become a motivation and the standard of its assessment-based speaking skill level.