Leaf Area Measurement Based on Image Processing

An efficient measuring method for live plant leaf area was proposed based on image processing technique. Image geometric distortions were corrected firstly using mapping function. For this, Hough transformation was exploited to acquire the coordinates of quadrangle corner points in distorted image. Then, image segmentation was performed using threshold method. To eliminate the influence of holes in the leaf, a new contour extraction approach was presented. Pixel scanning from one side to opposite side was implemented in four directions to extract object contour. Next, contour region was filled. Finally, leaf area was measured by pixel number statistic. Moreover, other important parameter, leaf perimeter, can also be obtained using our method. The proposed method was tested with some live leaf images. Experimental results show our method can measure the plant leaf area accurately.