FOCUSING METHOD AND IMAGE PROCESSING METHOD OF IMAGE PROCESSOR,申请号JP19900021158-传众专利搜索

FOCUSING METHOD AND IMAGE PROCESSING METHOD OF IMAGE PROCESSOR

申请公布号：JPH03223806(A)

申请号：JP19900021158

申请日期：1990.01.30

申请公布日期：1991.10.02

申请人：

KUBOTA CORP

发明人：TAKEUCHI KATSUYUKI;TOSHIMA TOSHIO

分类号：G02B7/36;G02B21/36;H04N5/232

主分类号：G02B7/36

摘要：PURPOSE:To eliminate the need to install a focusing controller separately by finding the peak value of the differential histogram of image data at each position while moving the lens barrel position of an optical system which projects an image on a video camera in order, and positioning the lens barrel at the position where the maximum peak value is obtained. CONSTITUTION:The image data are read out of an image memory 4, the absolute values of density difference of respective picture elements from adjacent picture elements are found, and the absolute values are added by density to find a density histogram. Then the density histogram is divided by the number of picture elements to find the differential histogram, whose peak value is found, Said operation for finding the peak value of the differential histogram is repeated while the lens barrel position is moved by a lens barrel driving device 6 to find the lens barrel position where the maximum peak value is obtained. This lens barrel position is a focusing position and the lens barrel is driven by a lens barrel driving device 6 to obtain the focusing state. Consequently, the need to install the focusing controller separately is eliminated.