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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 wasting processor resources and large delay, and achieve the effects of small delay, improved correction speed and saving processor resources

Inactive Publication Date: 2010-07-14
王晓年
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

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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 samplers through FPGA, thereby realizing real-time distortion correction and acquisition of images. In order to reduce the sampling error, a frequency doubling scheme is implemented by dynamically selecting two counters. The system can directly resample the analog signal, and can also be installed inside the digital camera to output digital and analog signals at the same time to complete image correction and acquisition. It is simple, cheap, 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 sampling control module. The sam...

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 will be firstly introduced below.

[0088] 【Uniform sampling】

[0089] Regardless of whether it is a composite video signal or a component signal, the effective data signal of each line on the image can always be separated. The purpose of the image 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 an image, and the image signal between two line sync pulses is the effective data of the line.

[0090] Usually, existing image acquisition cards or digital cameras sample analog signals at the same frequency (uniform sampling) or uniformly read electrical signals of CCD and CMOS. Assuming that there a...

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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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IPC IPC(8): H04N5/208
Inventor 王晓年蒋伟平蒋平朱劲
Owner 王晓年
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