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Flow field image preprocessing method and system thereof

An image preprocessing, image technology, applied in image data processing, image enhancement, instrument and other directions, can solve the problem of long preprocessing time

Active Publication Date: 2015-08-26
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0003] The present invention provides a flow field image preprocessing method, and at the same time provides its image preprocessing system, aiming at the problem that the preprocessing takes a long time in the current flow field measurement, and improving the flow field image preprocessing efficiency

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  • Flow field image preprocessing method and system thereof
  • Flow field image preprocessing method and system thereof
  • Flow field image preprocessing method and system thereof

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Embodiment Construction

[0069] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0070] like figure 1 As shown, the flow field image preprocessing method of the present invention includes: (1) an averaging step, (2) an image stretching step, (3) a noise judgment step, (4) a fixed noise removal step, and (5) a second structure The value of the mean image step, (6) the mask operation step.

[0071] As an example, in the averaging step (1), N=3000, M=8 pixels; in the step (5) of constructing a binarized mean image, the binarization threshold G kth = 0.4.

[0072] The sub-step (3.2) of the noise determination step and the sub-step (4.3) of the fixed noise removal step determine the kth flow field image I k Whether there are bubbles on the screen, in this embodiment, the difference image window size is Q×Q, Q=11 pixels, and the bubble threshold is

[0073] figure 2 Shown are the steps in the mask operation to form the mask image ...

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Abstract

The invention provides a flow field image preprocessing method and a system thereof, belongs to the field of image preprocessing methods and devices, aims at the problem in the prior art that preprocessing time is relatively long is flow field measurement, and improves the flow field image preprocessing efficiency. The flow field image preprocessing method comprises the steps of equalization, image stretching, noise judgment, fixed noise removing, binary mean value image construction and mask operation. The flow field image preprocessing system comprises an input Ethernet port, an Ethernet input control chip, a digital signal processor, a synchronous dynamic random access memory, a dynamic storage chip, a live-line erasable programmable read only memory, an output Ethernet port and an Ethernet output control chip. According to the invention, the size and the power consumption are relatively small, and the flow field image preprocessing system can be embedded into an existing flow field measuring instrument to carry out flow field measured image preprocessing and output flow filed measured images relatively low in noise, so that the efficiency and the processing speed of a whole rear end processor are improved.

Description

technical field [0001] The invention belongs to an image preprocessing method and device, in particular to a flow field image preprocessing method and system for Ethernet communication. Background technique [0002] The study of high-speed flow fields has become more and more widely used in engineering practice (such as the maneuvering flight of aircraft, the complex shape flow of space shuttles, etc.), there are still many doubts in the current research, mainly because the flow field The environment of the flow field is relatively special, the particles inside it move fast, and the distribution is uneven. Bubbles, water mist may appear on the observation wall, etc.), making it difficult to obtain stable moving particle images, and the high speed of particle movement requires a relatively high acquisition performance of the camera. At present, the commonly used method is to use a high-speed camera to collect flow field pictures and transmit them to a PC for processing. Due...

Claims

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Application Information

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IPC IPC(8): G06T5/00
Inventor 杨华尹周平张冰董益民冯佳乐欧阳振兴
Owner HUAZHONG UNIV OF SCI & TECH
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