Histogram Analysis Of Unwanted Images Of Leaves At Various Stages Of Growth

5.1 Introduction Images of leaves at various stage of growth are captured from the plant in the field without plucking the leaves. Image of leaves from various bitter gourd plant are selected during different seasons. For each stage of growth 200 images are captured for the study. Unwanted background images are eliminated in photoshop version 7 and saved in PNG format. Median filter is used for preprocessing the images in various stages and sample screen shots are shown in figure 5(a).The images of healthy and diseased leaf at each stage is converted into RGB,HSI and HSV and a sample screenshot is are shown in figure 5(b).
5.2 Histogram analysis For every stage images (front and back) of twenty five leaves are randomly selected from healthy
The gray scale values of the histogram for front view of healthy leaves are between 48 and 250, 35 and 250. The initial gray scale value being close to 48, 35 respectively and the final gray scale value is close to 250. There is maximum probability of occurrence of gray level between 48 to 250 and 35 to 250.The gray scale values of the histogram of front view of the diseased leaves is between 25 and 250, and of back view its between 30 and 250. The initial gray scale value is close to 25 for front view, and 30 for back view. The final gray scale value is close to 250.The maximum probability of occurrence of the gray level is between 25 to 250 and 30 to
The percentage of difference with respect to healthy is 44.9 . Value of green in healthy leaves is 50 and disease leave is 41, showing 9 pixels difference. The percentage difference with respect to healthy is 45.3 .In blue value of healthy leave is 12 and the disease leave is 23 which shows 11pixel difference and percentage of difference with respect to healthy is 29.7 .For V (value)the healthy and diseased leaves values are 0.19 and 0.36 shows 17 pixel values difference. The percentage of difference with respect to healthy is 17.9. The values of Intensity in the healthy and diseased leaves are 0.09 and 0.24 which shows 15 pixel difference and the difference with respect to healthy leaves is