Camera image capturing method and system

Abstract

The invention provides a camera image capturing method and system. The system suitable for the method comprises a control terminal, an acquisition card, a microprocessor and a camera sensor, wherein the control terminal, the acquisition card, the microprocessor and the camera sensor are electrically connected in sequence. The method comprises the following steps: constructing an exposure time calculation model; setting the frame period number corresponding to the exposure time to be always 0; setting the line number or exposure fine adjustment parameters of each frame image period of the camera sensor to adjust the exposure time; enabling the camera sensor to receive the control parameters and perform image shooting; and outputting exposed images. The method and system have an obvious effect on the scene of switching the exposure time to photograph and shortening the image capturing time.

Description

technical field [0001] The invention belongs to the field of photoelectric detection, in particular to a camera imaging method and system. Background technique [0002] Industrial cameras are generally divided into three parts: camera sensor, FPGA control chip and external interface. Among them, camera sensors mainly include CCD and CMOS devices. Because the CCD sensor generates a lot of heat, there are many noises under high exposure, and the processing speed is slow, the quality control is difficult and the cost is high. Therefore, CMOS sensors are increasingly becoming the mainstream of camera sensors. [0003] The exposure methods of CMOS sensors are divided into global exposure and rolling shutter exposure. Rolling shutter exposure sensors are now more common due to their low cost. What the present invention is aimed at is a camera for rolling shutter exposure. [0004] For rolling shutter exposure control, there are MASTER mode and SLAVE mode. In MASTER mode, the ...

AI Technical Summary

Problems solved by technology

[0006] The existing solution is to keep the number of lines in each frame period of the camera sensor unchanged, change the number of frame periods corresponding to the exposure time, and the value of the exposure fine-tuning parameter to change the exposure, and the existing solution has the number of lines in each frame period of the camera sensor. The multiple of the number of lines leads to a high probability of outputting some more lines, so that under the same effective exposure conditions, the existing scheme takes longer

[0007] The frame synchronization signal and line synchronization signal of the existing solution are continuously output without interruption, so when new exposure parameters are input, one frame may still be in the output process and cannot be interrupted in time to generate a new exposure frame;

[0008] To sum up, with the exposure control method of the existing scheme, the actual exposure time may be much longer than the required exposure setting

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