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Sub-pixel image offset positioning and superimposition method and device, and video equipment

A sub-pixel level, offset positioning technology, which is applied in image communication, image enhancement, image data processing, etc., can solve the problems that the positioning accuracy can only reach the pixel level and the positioning accuracy is poor

Active Publication Date: 2017-02-22
TSINGHUA UNIV
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  • Abstract
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Problems solved by technology

However, its positioning accuracy can only reach the pixel level at best.
When the image is dominated by large scene objects, the positioning accuracy of this method is even worse

Method used

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  • Sub-pixel image offset positioning and superimposition method and device, and video equipment
  • Sub-pixel image offset positioning and superimposition method and device, and video equipment
  • Sub-pixel image offset positioning and superimposition method and device, and video equipment

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Embodiment Construction

[0023] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0024] figure 1 It is a flow chart of the sub-pixel level image offset positioning and superimposition method of the present invention. refer to figure 1 , the method includes the steps of:

[0025] Step 100, obtain a set of video images I k , k=1, 2, ..., K, K is an integer greater than or equal to 1.

[0026] In this step, a piece of video actually captured by the camera is composed of frames of images. This section assumes that there are K frames of image I k , k=1, 2, ..., K. Intensity distribution of each frame image It can be precisely described by the following models:

[0027]

[0028] where a is the pixel size, (x s ,y s ) is the centroid position of the image,

[0029]

[0030]

[0031] I(x, y...

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Abstract

The invention discloses a method for localization and superposition of sub-pixel-level image offset. The method comprises the steps that step 1, a group of video images Ik, wherein k=1, 2, ..., K, and K is an integer larger than or equal to 1; step 2, the first image I1 (m, n) serves as a reference image; step 3, the centroid offset of each image Ik (1<k<=K) from the second image to the Kth image and the first image is obtained, wherein the centroid offset of the kth image and the first image is (xkc, ykc) and 2<=k<=K; step 4, offset resistance operation of the sub-pixel-level accuracy is conducted on the kth image Ik, wherein 2<=k<=K and the offset is (-xkc, -ykc), and the images obtained after offset operation are I'k; step 5, all the images I'k obtained after offset operation are summated, an average value is obtained, an enhanced image IE is obtained, wherein 1<=k<=K and the offset of the first image is 0. By the use of the method, the video images with high quality can be obtained.

Description

technical field [0001] The invention relates to the field of image and video data processing, in particular to a sub-pixel level image offset positioning and superimposition method and device, and video equipment. Background technique [0002] For video data, due to the requirement of high-speed continuous shooting, the integration time of each frame of image is very short, about 10-100 milliseconds. One consequence caused by this is that the noise of each frame image is relatively large, and the signal-to-noise ratio is relatively low. In addition, the readout bandwidth of the image acquisition device CCD (or CMOS) of the video camera is limited. In order to ensure a sufficient frame frequency, the number of pixels of each frame image is relatively small, usually only 640x480 pixels, or less 320x200 pixels. The rate is relatively poor, and the picture quality is rough. [0003] The goal of image enhancement technology based on video data is to extract a clear image with l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/357G06T5/50
Inventor 周建锋苏彦霍卓玺高扬冯真真张茂林
Owner TSINGHUA UNIV
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