01604naa a2200205 a 450000100080000000500110000800800410001902400550006010000220011524501230013726000090026052009210026965000190119065000190120965000330122865000220126165300190128365300290130277300670133119998202020-01-08       2014    bl uuuu     u00u1 u    #d7 ahttp://dx.doi.org/10.10 94/PDIS-03-14-0290-RE2DOI1 aBARBEDO, J. G. A.  aAn automatic method to detect and measure leaf disease symptoms using digital image processing.h[electronic resource]  c2014  aA method is presented to detect and quantify leaf symptoms using conventional color digital images. The method was designed to be completely automatic, eliminating the possibility of human error and reducing time taken to measure disease severity. The program is capable of dealing with images containing multiple leaves, further reducing the time taken. Accurate results are possible when the symptoms and leaf veins have similar color and shade characteristics. The algorithm is subject to one constraint: the background must be as close to white or black as possible. Tests showed that the method provided accurate estimates over a wide variety of conditions, being robust to variation in size, shape, and color of leaves; symptoms; and leaf veins. Low rates of false positives and false negatives occurred due to extrinsic factors such as issues with image capture and the use of extreme file compression ratios.  aDigital images  aImage analysis  aPlant diseases and disorders  aDoença de planta  aImagem digital  aProcessamento de imagens  tPlant Disease, Saint Paulgv. 98, n. 12, 1709-1716, Dec. 2014.