Image signal sampling processing method and circuit

Abstract

The invention discloses an image signal sampling processing method and circuit. The processing method comprises the following steps: Q1, converting an image analog signal into a digital signal; Q2, according to the variable quantity of the digital signal, selecting sampling intervals of the image digital signal at the reference part and the signal part of the pixel image signal respectively; Q3, sampling at least one piece of image data in each interval; and Q4, calculating the image data of the reference part and the image data of the signal part to obtain a digital image calculation signal.According to the invention, an image analog signal is converted into a digital signal for operation, a storage circuit for analog quantity is canceled, the image analog signal processing process is reduced, the circuit structure is simplified, and the precision and the accuracy are improved by respectively acquiring a plurality of numerical values of the reference part and the signal part for operation.

Description

technical field [0001] The present invention relates to the technical field of image signal processing, in particular to an image signal sampling processing method and circuit. Background technique [0002] At present, the image signal adopts the analog method, which is collected from different positions of the image signal to obtain the image analog quantity, temporarily stores the collected data, and then selects two data at different positions of the same pixel for analog subtraction to obtain the changed data, and then After the changed data is amplified, the analog-to-digital conversion is performed, and then input to the control center for calculation. This processing method has the following disadvantages: the two data collected at different positions of the same pixel, because they are not collected at the same time, need to set a temporary Because the analog subtraction after the analog sampling can only be sampled once, so the effective range of the signal in time ...

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Problems solved by technology

[0002] At present, the image signal adopts the analog method, which is collected from different positions of the image signal to obtain the image analog quantity, temporarily stores the collected data, and then selects two data at different positions of the same pixel for analog subtraction to obtain the changed data, and then After the changed data is amplified, the analog-to-digital conversion is performed, and then input to the control center for calculation. This processing method has the following disadvantages: the two data collected at different positions of the same pixel, because they are not collected at the same time, need to set a temporary Because the analog subtraction after the analog sampling can only be sampled once, so the effective range of the signal in time cannot be fully utilized to achieve sufficient sampling; When feeding the ADC, the ADC resamples the various noises brought in, as well as the analog noise brought in during the temporary storage circuit; on the other hand, the temporary storage circuit generally uses electronic switches and capacitors to store data, not only requires external analog circuit, there is also noise interference to the image data

Moreover, in the process of analog sampling, what is sampled is the signal of one point, not the average value. Due to the existence of noise in the signal, the sampled signal will include noise, which will cause errors in the signal.

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