Python on how to mosaic pictures

classification

Image processing-PIL-python to mosaic pictures

Start

rely

Pillow                              5.2.0
python                              3.7.7

Offer code

# magic remark
# -*- encoding:utf-8 -*-
from PIL import Image
def _mosaic(img):
    s = img.size
    img = img.resize((10,10))
    img = img.resize(s)
    return img
def mosaic(img,fx,fy,tx,ty):
    c = img.crop((fx,fy,tx,ty))
    c = _mosaic(c)
    img.paste(c,(fx,fy,tx,ty))
    return img
if(__name__ == '__main__'):
    while(1):
        flag = False
        name = input('请输入文件名:')
        try:
            img = Image.open(name)
            flag = True
        except:
            print('无法读取文件')
        if(flag):
            break
    fx,fy,tx,ty = None,None,None,None
    while(1):
        flag = False
        name = input('请输入需要打马赛克的区域(x1,y1,x2,y2):')
        try:
            name = [int(i) for i in name.split(',')]
            if(len(name) != 4):
                raise ValueError
            fx,fy,tx,ty = name
            flag = True
        except:
            print('错误的格式')
        if(flag):
            break
    img = mosaic(img,fx,fy,tx,ty)
    while(1):
        cmd = input('处理完成,按1存储文件,按2显示文件,按3退出:')
        if(cmd == '1'):
            path = input('请输入存储路径:')
            try:
                img.save(path)
                exit()
            except:
                print('无法存储文件')
        elif(cmd == '2'):
            img.show()
        elif(cmd == '3'):
            exit()
        else:
            print('未知的命令:%s'%cmd)

effect

Code analysis

Import library

# magic remark
# -*- encoding:utf-8 -*-
from PIL import Image

Overall code and ideas

Ideas:

The main essence is in these few lines of code:

img = img.resize((10,10))
img = img.resize(s)

When the picture is zoomed out, the pixels will be merged. When the
picture is zoomed in, the pixels
will be copied. So if the picture is zoomed out and then zoomed in, the merged pixels will be copied a few minutes, and it will have a mosaic effect.

Code:

def _mosaic(img):
    s = img.size
    img = img.resize((10,10))
    img = img.resize(s)
    return img

Partial mosaic code and ideas

Ideas:

Cut out some parts, beat the cut out picture as a whole, and glue it back

Code:

def mosaic(img,fx,fy,tx,ty):
    c = img.crop((fx,fy,tx,ty))
    c = _mosaic(c)
    img.paste(c,(fx,fy,tx,ty))
    return img

Input file name

if(__name__ == '__main__'):
    while(1):
        flag = False
        name = input('请输入文件名:')
        try:
            img = Image.open(name)
            flag = True
        except:
            print('无法读取文件')
        if(flag):
            break

Enter the cutting position

    fx,fy,tx,ty = None,None,None,None
    while(1):
        flag = False
        name = input('请输入需要打马赛克的区域(x1,y1,x2,y2):')
        try:
            name = [int(i) for i in name.split(',')]
            if(len(name) != 4):
                raise ValueError
            fx,fy,tx,ty = name
            flag = True
        except:
            print('错误的格式')
        if(flag):
            break

Local fight

    img = mosaic(img,fx,fy,tx,ty)

Output section

    while(1):
        cmd = input('处理完成,按1存储文件,按2显示文件,按3退出:')
        if(cmd == '1'):
            path = input('请输入存储路径:')
            try:
                img.save(path)
                exit()
            except:
                print('无法存储文件')
        elif(cmd == '2'):
            img.show()
        elif(cmd == '3'):
            exit()
        else:
            print('未知的命令:%s'%cmd)

Code github

Program github

Author

hit-road

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