Image alignment method and device, storage medium and terminal
An image alignment and image technology, applied in the field of image processing, can solve the problems of insufficient accuracy and excessive calculation, and achieve the effect of improving image alignment
Active Publication Date: 2021-10-12
SPREADTRUM COMM (SHANGHAI) CO LTD
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[0006] However, in the existing image alignment method based on pyramid decomposition, it is easy to have the problem of excessive calculation or insufficient accuracy, which is difficult to meet the demand
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[0031] As mentioned above, image alignment methods can be divided into two categories in principle: image alignment methods based on pixel blocks and image alignment methods based on feature point matching. The algorithm complexity of the method based on feature point matching is generally higher than that of the pixel-based alignment method. It needs to extract the feature points first, and then match the special points, and realize the purpose of image alignment according to the mapping relationship between the feature points. Image alignment based on pixel blocks is simple and intuitive, but if the method design is not reasonable, it will lead to problems such as high algorithm complexity and poor results. The image alignment method for pixel blocks can be divided into spatial domain alignment method and frequency domain alignment method according to different scopes. Compared with the spatial domain image alignment method, the frequency domain image alignment method has mor...
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The invention discloses an image alignment method and device, a storage medium and a terminal. The method comprises the following steps: providing a reference image and a to-be-aligned image; performing pyramid decomposition on the to-be-aligned image to obtain a multi-layer decomposed image; performing first-level alignment on each image block of the decomposed image from the highest-level decomposed image to obtain a first alignment motion vector of the decomposed image, and performing second-level alignment on at least one part of each image block of the moved decomposed image to obtain a second alignment motion vector of each image block; and sequentially determining a second alignment motion vector of each image block in the next layer of decomposed image until the second alignment motion vector of each image block in the bottommost layer of decomposed image is determined. The method has the opportunity to achieve balance between two requirements of calculation amount and accuracy by adopting two algorithms, and the image alignment effect is improved.
Description
technical field [0001] The present invention relates to the field of image processing, in particular to an image alignment method and device, a storage medium, and a terminal. Background technique [0002] Image alignment has important applications in image denoising, super-resolution enhancement, image stitching, video compression, video anti-shake, object tracking, etc. It is a basic problem in the field of image and video processing. Image alignment algorithms are also one of the oldest and most widely used algorithms in the field of computer vision. [0003] Image alignment methods can be divided into two categories in principle: image alignment methods based on pixel blocks and image alignment methods based on feature point matching, each of which has the problems of complex algorithms and high design requirements. [0004] A widely used method in image alignment methods based on pixel blocks is the block matching algorithm. The general method is to divide the image in...
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Login to View More IPC IPC(8): G06T7/33
CPCG06T7/337G06T2207/10016G06T2207/20016G06T2207/20021
Inventor 冯召东张晓盟陈欢
Owner SPREADTRUM COMM (SHANGHAI) CO LTD