Fast Image Rotation Method

An image rotation and fast technology, applied in the direction of graphics and image conversion, image data processing, instruments, etc., can solve the problems of complex calculation, low computational complexity, slow calculation speed, etc., to achieve reduced computational complexity, fast image rotation, and convenient The effect of hardware implementation

Inactive Publication Date: 2019-07-26
TIANJIN UNIV
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Problems solved by technology

[0006] In order to overcome the deficiencies of the prior art and aim at the problems of complex calculation and slow calculation speed of the traditional image rotation method, the present invention aims to propose a fast image rotation method with low computational complexity, which is convenient for hardware implementation and suitable for real-time processing

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Embodiment Construction

[0028] Image rotation is actually the calculation of pixmap coordinates. Since the coordinates of pixels are continuous, there is a certain connection between the mapping coordinates of adjacent pixels. An image consists of multiple rows of pixels, and the mapping coordinates of the first row and first column of pixels can be calculated first, and then the coordinates of other pixels can be obtained on this basis. The invention proposes a method for calculating mapping coordinates by using a fixed step value to calculate the mapping coordinates of other pixel points. Since the mapping coordinates must be integers, the step value is obtained by an approximate method based on the tangent value of the rotation angle, as follows, the step value is N, the rotation angle is θ, and N has a reciprocal relationship with tanθ:

[0029]

[0030] Among them, round represents the rounding operation. The step value is N, which means that every N pixels, the mapping coordinates are tran...

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Abstract

The invention relates to the field of image processing and computer graphics, and provides a low-computation-complexity rapid image rotation method. The method is convenient for hardware implementation and suitable for real-time processing. The adopted technical scheme is the rapid image rotation method comprising the steps that mapping coordinates are calculated by using a fixed step value, and the mapping coordinates of other pixel points are calculated; and the mapping coordinates must be integers, and the step value is obtained according to the tangent value of the rotation angle by using an approximation method as follows: the step value is set as N, the rotation angle is set as theta, and N and tantheta have the reciprocal relationship: N=round(1 / tantheta), wherein round refers to rounding operation, the step value is N and means that the mapping coordinates transform for a row for every N pixel points, and the mapping coordinates of the first column of pixels transform for a column for every N rows. The rapid image rotation method is mainly applied to image processing.

Description

technical field [0001] The invention relates to the fields of image processing and computer graphics, in particular to a method for rapidly realizing image rotation. Background technique [0002] As a basic image geometric transformation, image rotation is widely used in image processing fields such as image fusion and image stitching, as well as practical application fields such as automotive electronics, drones, military affairs, and remote sensing. Image rotation schematic diagram such as figure 1 shown. [0003] The formula for image rotation is as follows: [0004] [0005] Among them, θ is the rotation angle, (i, j) is the pixel coordinate in the original image, (x i,j ,y i,j ) is the mapping coordinate of (i, j) in the rotated image after rotation. Since the mapping coordinates calculated by formula (1) are not necessarily integers, if they are directly mapped, holes or overlaps will occur in the target image. Traditional image rotation methods often use inte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T3/60
CPCG06T3/60
Inventor 史再峰张洪汝姚素英庞科徐江涛高静
Owner TIANJIN UNIV
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