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FPGA-based real-time implementation method for interframe-accumulation and noise-reduction algorithm of low-light video

An implementation method and video frame technology, applied in television, computing, color television, etc., to achieve the effect of reducing storage device capacity requirements and clock frequency requirements

Active Publication Date: 2018-04-06
NANJING UNIV OF SCI & TECH
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Problems solved by technology

These two points limit the application of multi-frame accumulation in actual engineering

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  • FPGA-based real-time implementation method for interframe-accumulation and noise-reduction algorithm of low-light video
  • FPGA-based real-time implementation method for interframe-accumulation and noise-reduction algorithm of low-light video
  • FPGA-based real-time implementation method for interframe-accumulation and noise-reduction algorithm of low-light video

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Embodiment Construction

[0014] The purpose of the present invention is to provide a real-time display method for multi-frame accumulated low-light video denoising under the condition that memory storage capacity and clock frequency are relatively scarce. The operation is performed by calculating and storing the difference between the gray value of the corresponding pixel of the multi-frame image and the corresponding pixel of the current frame, using the maximum operable bit width of the storage device, and assigning different bits according to the time distance from the current frame Wide to store the difference between the gray value of the same pixel as the current frame, which saves storage space and reduces the impact on the filtering effect, and finally achieves accumulation under the condition of a small capacity storage space of 13.27Mb and a lower clock frequency of 27MHz Inter-frame accumulative filter noise reduction with 8 frames.

[0015] The operation is performed by calculating and sto...

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Abstract

The invention discloses an FPGA-based real-time implementation method for the interframe-accumulation and noise-reduction algorithm of a low-light video. The difference value between the correspondingpixel points of multi-frame images and the gray value of the corresponding pixel point of a current frame is calculated and stored. According to the time degree of distance or of closeness, a difference value of the gray value of the same pixel point of the current frame is stored by distributing different bit widths. Meanwhile, two 16-bit data, namely 32-bit data, are obtained for each pixel clock during output. The 32-bit data are composed of the 8-bit grayscale data of the pixel point at the newest frame, and 7 grayscale difference information stored by the remaining 24-bit data. Through calculation, the grayscale information output after the accumulated average of 8 frames is obtained. According to the invention, the required capacity requirement of a memory device is reduced. Meanwhile, the requirement for the clock frequency of the memory device needed by the multi-frame accumulation algorithm is also reduced.

Description

technical field [0001] The invention belongs to the field of low-light imaging denoising, in particular to a method for realizing cumulative denoising of multiple frames by using a storage device with low speed and less storage space. Background technique [0002] In recent years, with the development of science and technology, low-light night vision technology has made great progress. Low-light night vision technology is to obtain the image information of the target scene under the weak light at night. Photons are converted into electrons through the photoelectric effect of the photocathode. An optical image visible to the human eye. Obtaining clearer and more accurate images has become an important research direction. Under this current situation, low-light imaging technology has gradually become a military-civilian dual-use technology that the country is vigorously developing. [0003] The main disadvantage of low-light images is that random noise is serious. The distr...

Claims

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Application Information

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IPC IPC(8): G06T5/00H04N5/21
CPCH04N5/21G06T5/70
Inventor 钱芸生王逸伦周晓瑜唐小东沈家炜倪苏涵
Owner NANJING UNIV OF SCI & TECH
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