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 Teknik Watermark CDMA dalam Domain Spasial dan Domain Wavelet pada Citra Digital
Abstrak: Presentation of data and information has been progressing quite rapidly, so data and information has been widely presented in digital format. Problems began to emerge as widespread digital data need to be protected. This is related to ownership, copyright, or authenticity issues. This study tries to provide solutions to these problems by applying the digital watermarking with Code Division Multiple Access (CDMA) technique. This technique uses a digital image composed of a cover image and two types of watermark (initial and copyright). There are two stages in this research, the first is trying to insert two types of watermark on the cover image in two different domains, namely spatial domain and wavelet domain. Once inserted, the watermark is extracted back to be compared with the original watermark. The second is attempting to insert an initial watermark on the cover image in two different domains, then giving some distortion of the image to be tested for resistance. After that, the watermark is extracted again. From the experiment results, it is known that wavelet domain CDMA is superior in terms of quality of the extracted watermark, processing time, and resistance to distortion (JPEG compression and gamma correction). While CDMA coding spatial domain is simpler and has a resistance to gamma correction only.
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Judul: Ornithonyssus Bursa (Berlese, 1888) Famili Macronyssidae yang Menyerang Unggas Dan Penaggulangannnya
Abstrak: Ornithonyssus bursa adalah tungau penghisap darah pada unggas di daerah tropis dan subtropis. Tungau ini relatif kecil, dengan panjang tubuh antara 700-1000 mikron dan lebarnya 250-490 mikron. Tubuhnya bulat berwarna coklat kekuningan sebelum menghisap darh dan berwarna merah setelah menghisap darah dari induk semangnya.
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