High-speed flexible sampling image sensor and its sampling control method

Abstract

The invention relates to a high-speed flexible sampling image sensor. The image feedback unit of the sensor receives the image data output by the reading circuit and locates the row or column pixels that need to be sub-sampled or windowed, and transmits the selection data instruction to the encoding logic unit; The logic unit encodes according to the selection instruction; the row selection decoder and the column selection decoder respectively decode the row encoding signal and the column encoding signal output by the encoding logic unit. In the windowing mode or sub-sampling mode, the row selection decoding The encoder controls the drive control circuit according to the decoding result, selects pixels in the corresponding row for scanning, and at the same time, the column selection decoder controls the reading circuit to select the pixel data in the corresponding column for reading. The invention has high effective data reading speed, strong controllability, high window opening efficiency, and does not additionally increase the volume of the sensor.

Description

technical field [0001] The invention belongs to the technical field of image sensors, and in particular relates to a high-speed and flexible sampling image sensor capable of selecting a specific pixel area to work and a sampling control method thereof. Background technique [0002] CMOS image sensor is a photoelectric imaging device widely used in machine vision, target detection, security monitoring and medical detection. Due to its advantages of low cost and high integration, the image sensor chip can integrate more camera system functions, thereby reducing The peripheral circuit of the camera realizes the miniaturization of the camera volume and the diversification of functions. [0003] In industrial detection, in order to achieve fast imaging and key target monitoring, the camera first performs sub-sampling mode, the principle of which is as follows figure 1 As shown, after the sensor finds the target, it enters the window scanning mode, and only scans all pixels in a ...

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Problems solved by technology

[0004] In order to achieve the above functions, functional modules are generally added to the peripheral circuit of the camera, and the windowing function is realized from the additional functions of the system. Reading, to realize the half-opening of the sensor window, these control methods have disadvantages such as poor controllability of the sensor pixels and poor window opening efficiency, and at the same time, the extra peripheral circuit increases the size of the camera and is not conducive to carrying

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