Image embedded processing system and obtaining and positioning method for low-light image light spots

Abstract

The invention belongs to the technical field of precise metering instruments, and particularly relates to an image embedded processing system and an obtaining and positioning method for low-light image light spots. The invention is based on a CMOS (complementary metal oxide semiconductor) or CCD (charge coupled device) image device for obtaining a low-light image, and constructs the embedded image processing system taking an FPGA (field programmable gate array), a DSP (digital signal processor) and a DDR3 as main chips. In algorithm, a filtering algorithm combining a morphology filtering operator and a mid-value filtering operator are is adopted for filtering the image; and meanwhile, an overall image dynamic range adjuster aiming at the characteristics of the low-light image and an enhancer aiming at the contrast of local characteristics are designed. The light spot detecting and positioning method comprises the steps of sectioning the image firstly, performing fast detecting and primary positioning on the light spots by a region projection algorithm, and performing gray level fitting treatment on a locked detecting region to compute the sub-pixel-level position coordinate of a target. The image embedded processing system and the obtaining and positioning method for the low-light image light spots have the characteristics of strong real time performance and high accuracy, and are suitable for the detecting and positioning of the image target of a low-light image device.

Description

technical field [0001] The invention belongs to the technical field of precision measuring instruments, and in particular relates to an image embedded processing system and a low-illuminance image spot acquisition and positioning method, so as to realize precise measurement of shape and position and calculation of angle offset. Background technique [0002] The photoelectric self-collimation device is a high-precision angle measuring instrument. It combines optical self-collimation imaging technology, detector array technology and image processing technology to realize the precision of minute / second level change of plane angle within a certain range. Measurement. Due to its unique advantages in realizing small-angle multi-dimensional and non-contact measurement, it is widely used in the measurement of the straightness of the guide rail platform, the flatness of the precision platform, the shape and position tolerance of optical components, and the integration of optical syst...

AI Technical Summary

Problems solved by technology

For example, based on the computer and image sensor CCD or CMOS new autocollimator, its limitation is that it cannot be separated from the limitation of the computer, the instrument is heavy, and it is inconvenient to use and carry.

However, the accuracy of other miniaturized angle measuring devices developed based on embedded technology is difficult to meet the application requirements.

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