Judul: Pemampatan citra menggunakan Embedded Zerotree Wavelet
Abstrak: High quality digital images need large storage space. One solution to solve that is digital image compression techniques. This research used Embedded Zerotree Wavelet (EZW) method to compress 24-bit RGB images. EZW is very effective to quantize discrete wavelet coefficients and to generate the bit stream in order of importance. This research used several thresholds, i.e., 5, 10, 30, 50, and 70. The method is compared with JPEG and JPEG2000 compression method using Peak Signal-to-Noise Ratio (PSNR) and compression ratio as performance metrics. For JPEG compression, the image quality level is set at low, medium, high, and maximum. At threshold 10, the output quality of EZW compression approaches the low quality JPEG compression, but the compression ratio of EZW is higher (13.769 versus 5.766). Compression ratio of EZW at threshold 5 approaches the compression of medium level JPEG compression, but output quality of EZW is better than output quality JPEG (PSNR: 39.217 versus 36.537). For JPEG2000 compression, the image quality level is set at 30, 50, 80, and 100. At threshold 10, the output quality of the EZW compression approaches the output of the JPEG2000 compression at quality level 50, but the compression ratio of EZW is higher (13.679 versus 5.796). Compression ratio of EZW at threshold 5 approaches the compression of JPEG2000 at quality level 50, but output quality of EZW is better than output quality JPEG2000 (PSNR: 39,217 versus 36,289). Compression with EZW method can offer better results than the method of JPEG and JPEG2000 on condition adjacent to each other in quality of output or compression ratio.
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Judul: Perbandingan Metode Pemampatan Citra Antara JPEG dan GIF
Abstrak: Citra digital memerlukan waktu transfer lebih lama dan mang penyimpanan relatif jauh lebih besar dibandingkan data digital berupa teks. Pemampatan data digunakan untuk menghilangkan atau mengurangi data redllndancy, yang terbagi dua, yaitu lossless dan lossy. Pemampatan lossless terjadi jika data replika deng.n data asli sama, sedangk.n lossy terjadijika data replika dengan data asli tidak sarna. Joint Photographic Experts Grollp (JPEG) termasuk pemampatan lo,"y, sedangkan Graphics Interchange Format (GIF) termasuk lossless. JPEG terdiri dari 4 langkah utama, yaitu Discrete Cosine Transform (DCT), kuantisasi, rIIn-length encoding, dan Huffman coding. Citra dipilah-pilih menjadi ukuran 8x8 pixels, kemudian dilakukan DCT pad a matriks 8x8 dan menghasilkan matriks koefisien yang nilainya menyebar secara diagonal dari kiri alas menuju kanan bawah.
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Judul: Korpus Luteum Persisten pada Sapi serta Beberapa Aspek Penanggulangannya
Abstrak: Korpus luteum pada ovarium terbentuk pada hari ke lima atau ke enam setelah ovulasi terjadi. Bila pada uteru tidak terjadi kebuntingan, korpus luteun dinonaktifkan oleh hormon luteolitik yaitu prostaglandin yang dihasilkan dinding uterus. Jika pada uterus terjadi kebuntingan, korpus luteum tetap bertahan pada ovarium dan berfungsi secara normal, disebut korpus luteum graviditatum. Korpus luteum graviditatum aktif pada sapi betina (erti) selama total waktu 320 hari dalan satu tahun.
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