Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Fast Image Rotation Method
  • Fast Image Rotation Method
  • Fast Image Rotation Method

Examples

Experimental program
Comparison scheme
Effect test

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products