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
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[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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