A real-time deserialization processing method of cmos image sensor data signal

An image sensor and data signal technology, applied in the field of real-time processing of CMOS image sensor output data signals, can solve problems such as long-term overhead, and achieve the effects of low hardware resource overhead, high real-time performance, and simple logic circuit structure

Active Publication Date: 2018-11-23
NORTHWEST INST OF NUCLEAR TECH
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Problems solved by technology

The state machine will bring a relatively long time overhead in the process of alignment, search and lookup, and the time overhead is closely related to the quality of the circuit signal and has uncertainty, so this method is not suitable for high real-time trigger exposure Operating mode

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  • A real-time deserialization processing method of cmos image sensor data signal
  • A real-time deserialization processing method of cmos image sensor data signal

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Embodiment Construction

[0027] The technical principle and specific implementation of the present invention will be further described in detail below.

[0028] Step 1: Generate three clocks with the same phase from the input data bit clock DCLK, namely the bit clock DCLK, the half frame clock DCLK1 and the frame clock DCLK2.

[0029] Clock generation can be realized by using the clock management unit generally provided by FPGA. The bit clock is used for data bit latching, the half-frame clock is used for latching data at twice the frame frequency, and the frame clock is used for latching data at a frame frequency. The frame length depends on the number of quantization bits of the CMOS image sensor. For example, a CMOS sensor with a quantization precision of 12 bits has a data frame length of 12 bits, that is, 6 DCLK cycles. Multiple clocks with the same phase and different frequencies are used to transfer data from the higher frequency data bit clock domain to the lower frequency data frame clock dom...

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Abstract

The invention discloses a real-time deserialization processing method of a CMOS image sensor data signal. The invention proposes a new real-time processing method of CMOS image sensor data signal, which replaces the circular search and search of the state machine of the traditional scheme, and realizes the real-time decoding processing of the high-speed serial source synchronous signal. The real-time processing method of the CMOS image sensor data signal is based on a linear time logic circuit, and uses the bit clock DCLK output by the CMOS image sensor to perform double-edge latching on the serial data stream with a double data rate to ensure the relative phase of the latch clock and the data signal ; Use the bit clock DCLK to generate half-frame clock DCLK1 and frame clock DCLK2 with the same phase, which ensures that the phase difference between different frequency clock domains is small, which is conducive to the stable transmission of signals across clock domains; using two consecutive latching techniques, Realize the effective data transmission from the high-frequency clock domain to the lower-frequency clock domain, so as to finally realize the high real-time performance of sensor data processing.

Description

technical field [0001] The invention relates to a real-time deserialization processing method of a high-speed serial source synchronous signal, in particular to a real-time processing method of a CMOS image sensor output data signal. Background technique [0002] CMOS image sensors are widely used in various image capture systems. Due to their high data output bandwidth and relatively general processing technology, they gradually replace CCD image sensors in the field of high-performance imaging and become the main imaging device. Especially in high frame rate imaging systems, CMOS image sensors have become the mainstream high frame rate imaging devices by utilizing their higher data output bandwidth, better consistency, and faster on-chip analog signal processing technology. Different from the output analog voltage of CCD image sensor, CMOS image sensor converts the induced charge of the pixel, samples and quantifies it, and outputs it. The output data signal is a high-spee...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/374H04N5/3745
CPCH04N25/76H04N25/77
Inventor 严明杨少华李刚郭明安李斌康
Owner NORTHWEST INST OF NUCLEAR TECH
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