Abstract
As long as digital image has been captured, there is an innate limitation on resolution. Thus, in application of measuring image there are usually limited by hardware equipment and can’t be exactly measured. However, The image interpolation is the key technique to break this limitation. This research uses image enlargement technique to realize exactly measurement of subpixel precision, and hopes using software to assist hardware, and break the limitation of resolution on hardware. Due to the general subpixel measurements are from edge detection to enlarge edge, and then use edge detection again to get the image for measurement. However, because of the image sample in this paper is much simple, after using binary and then enlarging the image, measuring the image. It is obviously that we can shorten the time of measuring image on the production line. This paper discusses several existing interpolation enlargement algorithm, and realize these algorithm through program. It is hope that the image measuring software raised in this paper can apply to the real production line.