A calibration method and device for high-speed serial LVDS signals output by a CMOS image sensor

Abstract

The invention relates to an improved calibration method and device for high-speed serial LVDS signals output by a CMOS image sensor. The CMOS image sensor outputs a multi-channel high-speed serial LVDS calibration sequence. A receiving end carries out differential-to-single end conversion, delay adjustment and 1: 8 serial-to-parallel conversion on the received multi-channel serial LVDS signals tocomplete phase alignment of an image pixel clock and data, the image pixel clock carries out sampling at the middle position of an image data eye pattern, and the receiving end correctly recovers thecalibration sequence. Whether the eye pattern width of the current image data meets the LVDS signal eye pattern width minimum value requirement or not is calculated in real time; and if the requirement is met, next channel signal calibration is carried out, otherwise, the current channel signal calibration is continued, thereby ensuring that the receiving end can reliably recover the digital imagedata when the external environment temperature and the signal voltage fluctuation cause the change of the serial LVDS signal eye pattern after the serial LVDS signal calibration of all channels is completed.

Description

technical field [0001] The invention belongs to the field of image processing, and relates to an improved calibrating method and device for outputting high-speed serial LVDS signals of a CMOS image sensor. Background technique [0002] At present, digital image signal transmission methods can be divided into parallel and serial transmission methods. However, with the improvement of digital image pixel clock frequency and data transmission rate, the parallel transmission method is susceptible to transmission media and external interference, resulting in data reception errors at the digital image receiving end. [0003] Low-voltage differential signaling (LVDS) serial transmission technology has the advantages of high speed, low power consumption, low noise and low electromagnetic interference, etc., and has been widely used in high-speed digital image signal transmission. However, the high-speed serial LVDS image signal calibration method is susceptible to external environme...

AI Technical Summary

Problems solved by technology

However, the high-speed serial LVDS image signal calibration method is easily affected by the external environment temperature and signal voltage fluctuations, resulting in the receiving end still unable to correctly restore the digital image data after the receiving end circuit board completes the LVDS signal calibration.

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