Nonuniform sampling-based image correction system and method

A non-uniform sampling and image correction technology, which is applied in the field of image processing, can solve the problems of large delay and waste of processor resources, and achieve the effects of small delay, improved correction speed and saving processor resources

Inactive Publication Date: 2014-08-13
王晓年
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, not only the delay is large, but also a waste of processor resources

Method used

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  • Nonuniform sampling-based image correction system and method
  • Nonuniform sampling-based image correction system and method
  • Nonuniform sampling-based image correction system and method

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Embodiment 1

[0056] The invention discloses an image acquisition and correction system based on non-uniform sampling, which realizes non-uniform sampling of analog image signals by controlling AD sampler through FPGA, thereby realizing real-time distortion correction and acquisition of images. To reduce the sampling error, a frequency multiplication scheme is implemented by dynamically selecting two counters. The system can directly resample the analog signal, and can also be installed in the digital camera, output digital and analog signals at the same time, complete the image correction and acquisition work, and has the characteristics of simplicity, low cost, and real-time.

[0057] see Figure 8 The image correction system based on non-uniform sampling of the present invention mainly includes an analog video signal receiving module, a signal sampling module and a sampling control module; the signal sampling module is connected to the analog video signal receiving module and the samplin...

Embodiment 2

[0087] In the present invention, the non-uniform sampling technology is used to collect video data, and the difference between the existing uniform sampling and the non-uniform sampling of the present invention is first introduced below.

[0088] [Uniform sampling]

[0089] Whether it is a composite video signal or a component signal, the valid data signal for each line on the image can always be separated. The purpose of the frame acquisition card is to convert the analog image signal of each line into a digital signal, and finally form a digital image. figure 2 It is a schematic diagram of a composite video signal, in which the field sync pulse marks a field image, and the image signal between two line sync pulses is the valid data of the line.

[0090] Generally, existing image acquisition cards or digital cameras use the same frequency (uniform sampling) to sample analog signals or uniformly read electrical signals of CCD and CMOS. It is assumed that there are three lin...

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Abstract

The invention discloses a nonuniform sampling-based image correction system and a nonuniform sampling-based image correction method. The system comprises an analog video signal receiving module, a signal sampling module and a sampling control module; the signal sampling module is connected with the analog video signal receiving module and the sampling control module; and the sampling control module controls the signal sampling module to sample an analog video signal, realizes the nonuniform sampling of the analog video signal, and realizes the real-time distortion correction and the acquisition of a video image. The nonuniform sampling-based image correction system and the nonuniform sampling-based image correction method provided by the invention have the advantages of realizing the real-time correction through the nonuniform sampling while sampling, saving processor resources, having relatively small time delay, and improving the correction speed of an image.

Description

technical field [0001] The invention belongs to the technical field of image processing, and relates to an image processing system, in particular to an image correction system based on non-uniform sampling; in addition, the present invention also relates to an image correction method based on non-uniform sampling. Background technique [0002] Projective transformation is the mapping relationship between two planes. Even objects located on the same plane will have projective distortion in their images. In the distorted image, the originally parallel straight lines are no longer parallel, which brings a lot of inconvenience to the later image processing. In order to restore the metric relationship in Euclidean space, the existing correction methods are all correcting the projective distortion through calculation after obtaining the distorted digital image. [0003] Since the image plane of the camera is probably not parallel to the plane to be photographed, it will cause pro...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): H04N5/208
Inventor王晓年蒋伟平蒋平朱劲
Owner王晓年