Computerized Video-Image Preprocessing with Applications to Cardio-Angiographic Roentgen-Image Series

Optical flow is an important kind of video motion tracking algorithm, and Lucas-Kanade (LK) algorithm is an effective differential method in terms of calculating optical flow. The 3D Gaussian smoothing filter is properly introduced in the image preprocessing stage of the LK algorithm, which makes it possible to increase the correlation of the adjacent pixels in the time axis, improve the blur effect of the video image and overcome the 2D Gaussian filters disadvantage that is not suitable for the video image processing. More importantly, the optimized 3D non-Gaussian matching filter is chosen during the 3D derivative calculating, and it is capable of reducing the error rate of the velocity vector calculation and enhancing the calculation accuracy of the optical flow.

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Digital Video Image Preprocessing Algorithm Based on Embedded System

Journal of Physics Conference Series ◽

10.1088/1742-6596/2074/1/012004 ◽

2021 ◽

Vol 2074 (1) ◽

pp. 012004

Author(s):

Ling Cheng

Keyword(s):

Embedded System ◽

Digital Video ◽

Video Image ◽

Network Interface ◽

Median Filtering ◽

Image Preprocessing ◽

Filtering Algorithm ◽

Video Images ◽

Low Illumination ◽

Wavelet Image

Abstract To solve the massive noise contained in the images acquired under low illumination, we designed a digital video image Preprocessing device with the denoising function. Based on the embedded CPU and operating system, video images are acquired by the camera. The noise contained in the video images is filtered by the improved median filtering algorithm and wavelet image denoising. Subsequently, the images are transmitted through USB and network interface, and the storage function of image files is implemented. The device can remove the noise contained in videos effectively, which is conducive to performing more advanced processing on the images.

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Multiprocessor system for the real-time digital processing of video-image series / Ein Multiprozessorsystem für die digitale Verarbeitung von Fernsehbildserien in Echtzeit

it - Information Technology ◽

10.1515/itit-1979-0405 ◽

1979 ◽

Vol 21 (4) ◽

Author(s):

Nicolae G. C. ◽

Κ. H. Höhne

Keyword(s):

Real Time ◽

High Speed ◽

Digital Processing ◽

Video Image ◽

Multiprocessor System ◽

The Real ◽

Image Series ◽

Data Rates ◽

Structured Design Methods ◽

Display Processor

In the course of a project for the analysis of X-ray picture series a new system for the digital processing of video-image series has been developed. It allows the real time digitization (up to 512 pixels/line, 8 bits/pixel), and high speed processing of video-picture series and a presentation of results in an easily interpretable way by a colour TV-display processor. As a characteristic of the system the extreme requirements concerning the digitization and processing speed (with data rates up to 80 Mbaud) are met by a realization in the form of a multiprocessor structure. The microprogrammed special processors communicate via a high speed asynchronous bus with a throughput of 15 Mwords/ s. Their functions are controlled by the commands of a host computer (e.g. PDP U/45). In order to achieve the above performance, structured design methods such as Petri-nets have been applied, which give rise to a more transparent design, better documentation and shorter implementation times. This paper describes the design, the structure, the programming and the application of the system.

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