Device and method for acquiring high dynamic range images by adopting linear array charge coupled device (CCD)

Abstract

The invention relates to a device and a method for acquiring high dynamic range images by adopting a linear array charge coupled device (CCD). The device and the method are used for realizing high dynamic range imaging. The device comprises a linear array CCD image sensor for acquiring the high dynamic range images, a time sequence circuit for acquiring the high dynamic range images, and a computer; and the computer contains a transfer function correction-based image fusion algorithm for acquiring the high dynamic range images. Linear array CCD image acquisition for acquiring the high dynamicrange images is adopted in the device; under the control of the time sequence circuit for acquiring the high dynamic range images, the row exposure time of the linear array CCD is separately controllable and circularly variable in a certain period; and the images acquired by the linear array CCD are transmitted to the computer in real time through the time sequence circuit. The computer writes the time sequence of the linear array CCD into the time sequence circuit for acquiring the high dynamic range images. The transfer function correction-based image fusion algorithm is completed on the computer, and the images acquired by the linear array CCD and containing multiple different exposure times are synthesized by using the algorithm, so that high dynamic range imaging is realized.

Description

technical field [0001] The invention relates to a device and method for acquiring images with a large dynamic range using a linear array CCD, which is used for realizing imaging with a large dynamic range. Background technique [0002] High Dynamic Range Imaging (High Dynamic Range Imaging) is a very popular technology in recent years. Simply put, it is to make photos show a greater difference between light and dark, under-exposure under strong light, and under-exposure under low light, so that all Layers and details are clear. [0003] The dynamic range of the CCD image sensor is mostly 60dB, and the dynamic range limited by the pixel size can only obtain a limited width. In order to obtain images with clear layers and details within the limited dynamic range, high-precision exposure control must be required. . In the past, to obtain the HDR effect of digital photos, it was generally necessary to repeatedly take multiple photos of the same scene with different exposures, ...

AI Technical Summary

Problems solved by technology

[0004] Similarly, in the industrial field, many targets are imaged under strong light irradiation or transmission. Due to the existence of strong light, CCD imaging is very likely to be overexposed, such as reducing the exposure time, and some areas may be underexposed. In order to make the camera have For a wider dynamic range, researchers have proposed some methods, such as using a CMOS sensor with a non-linear exposure curve, but this method reduces the contrast (or grayscale resolution) of the image while increasing the dynamic range.

Images