Rudiati Evi Masithoh

Determination of soluble solids content and titratable acidity of intact fruit and juice of satsuma mandarin using a hand-held near infrared instrument in transmittance mode

Determination of soluble solids content (SSC) and titratable acidity (TA) of intact fruit and juice of satsuma mandarin was carried out using a hand-held near infrared instrument (“NIR-Gun”) in transmittance mode. The resulting calibration model measured SSC in intact fruit and juice with a standard error of prediction (SEP) of 0.33 °Bx and 0.42 °Bx, respectively. TA measurements yielded SEP values of 0.22% and 0.14% for intact fruit and juice, respectively.

Development of Plant Growth Monitoring System Using Image Processing Techniques Based on Multiple Images

The research aimed at developing plant growth monitoring system based on image processing technique from images captured using multi-cameras (webcams). The output of the research was a monitoring system equipped with graphical user interface (GUI) to monitor the plant growth and nondestructively predict age and fresh weight of mustard (Brassica rapa var. parachinensis L.). Five webcams on five different positions were installed on the image-capturing box to capture the plant images every 3 days up to 48 days. Then, 1050 images of 70 plants on vegetative period resulted. Of these, 700 images were used for training and 350 images for validation. An artificial neural network (ANN) was used to predict age and weight of the plants. The network architecture consisted of four layers with five input neurons, first hidden layer with five neurons, second hidden layer with five neurons, and output layers with one neuron. Training function of ANN used was trainlm and learning rate value was 0.001. The activation function for predicting plant age and plant weight was logsig-logsig-tansig and logsig-tansig-tansig, respectively. ANN models could predict plant age with an R2 value of 0.96 and fresh weight with an R2 value of 0.95.

PENENTUAN DIMENSI TERONG JEPANG (Soalnum melongena L) DENGAN TEKNIK PENGOLAHAN CITRA SECARA WAKTU NYATA

A real-time image processing technique was applied to determine the dimensions, i.e. length and width, of eggplants. Results showed that illuminations performed a significant role; the ideal illumination type for the experiment was TL lamp (fluorescent lamp), which was placed in perpendicular position toward conveyor. Meanwhile, the ideal eggplant-positions were longwise on the conveyor. Applying those kind of circumstances, a relationship between developed program and manual measurement of eggplant length and width showed linier equation, i.e. y = x and y = 0,99 x, respectively.