python 图像移动与缩放

忘是亡心i 2022-04-17 06:48 269阅读 0赞

from PIL import Image
    from os import listdir
    import math
    import numpy as np
    import cv2
    
    # texture: a texture
    # offsetX: min U ,not offset distance(=abs(min U))
    # offsetY: min V ,not offset distance(=abs(min V))
    # usScale: max((maxU-minU),(maxV-minV))
    def textureTransform( texture, offsetX, offsetY, uvScale):
    
        offsetX = offsetX % 1
        offsetY = offsetY % 1
        width, height = texture.size
    
        #-------------------first deal horizontal--------------------------
        AfterXTexture = Image.new(texture.mode, (width, height))
        if(offsetX > 0):
            offsetWidth = int(round(width * offsetX))
            region1 = texture.crop((0,0,offsetWidth,height))
            region2 = texture.crop((offsetWidth, 0, width, height))
            AfterXTexture.paste(region2, box = (0, 0))
            AfterXTexture.paste(region1, box = (width-offsetWidth, 0))
        elif(offsetX < 0):
            offsetX = abs(offsetX)
            offsetWidth = int(round(width * offsetX))
            region1 = texture.crop((0, 0, width - offsetWidth, height))
            region2 = texture.crop((width - offsetWidth, 0, width, height))
            AfterXTexture.paste(region2, box = (0, 0))
            AfterXTexture.paste(region1, box = (offsetWidth, 0))
        else:
            AfterXTexture = texture
    
        #-------------------second deal vertical--------------------------
        AfterYTexture = Image.new(texture.mode, (width, height))
        if(offsetY < 0):
            offsetHeight = int(round(height * offsetY))
            region1 = AfterXTexture.crop((0, 0, width, offsetHeight))
            region2 = AfterXTexture.crop((0, offsetHeight, width, height))
            AfterYTexture.paste(region2, box = (0, 0))
            AfterYTexture.paste(region1, box = (0, height-offsetHeight))
        elif(offsetY > 0):
            offsetY = abs(offsetY)
            offsetHeight = int(round(height * offsetY))
            region1 = AfterXTexture.crop((0, height - offsetHeight, width, height))
            region2 = AfterXTexture.crop((0, 0, width, height - offsetHeight))
            AfterYTexture.paste(region1, box = (0, 0))
            AfterYTexture.paste(region2, box = (0, offsetHeight))
        else:
            AfterYTexture = AfterXTexture
    
        #-------------------third deal scale--------------------------
        finalWidth = int(width * uvScale)
        finalHeight = int(height * uvScale)
        finalTexture = Image.new(texture.mode, (finalWidth, finalHeight))
        repeat = int(uvScale)
        for i in range(0, repeat + 1):
            for j in range(0, repeat + 1):
                finalTexture.paste(AfterYTexture, box = (j*width, finalHeight-(i+1)*height))
    
        #-------------------fourth return result--------------------------
        return finalTexture