| 摘要 |
An automatic focal point sensing device comprises an image sensor on which an optical image is projected and which photoelectrically converts the image pixel by pixel to generate image data, a first calculation circuit which generates more than one pixel block, each pixel block being the sum of consecutive pixel data items, calculates one of the sum of the differences between two adjacent pixel blocks and the sum of the square of each of the differences of two adjacent pixel blocks as the contrast value, and which determines more than one contrast value by changing a combination of pixel data items contained in each pixel block each time image data is inputted, and a second calculation circuit for calculating the sum of the contrast values determined by the first calculation circuit as an evaluation value and determining the degree of focusing on the basis of the evaluation value.
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