Shulou(Shulou.com)06/02 Report--

In this issue, the editor will bring you about how to use Python to make a website to help little sister generate cartoon avatars. The article is rich in content and analyzes and narrates it from a professional point of view. I hope you can get something after reading this article.

For animation, we must be no stranger, a lot of single programmers around the editor are animation fans. The editor is also a senior animation fan, there are a lot of beautiful little sisters in the animation, such as Medusa, Yunyun, Xiao Xuner, Purple Girl in the nine songs of Tianxing, Yan Lingji. Of course, girls also have their own anime feelings, and there are also little sisters in the department who like cosplay, so I think since Python is omnipotent, I might as well use Python to make a Mini Program to help the little sister's profile picture turn into a cartoon. Later, you can also chat up the little sister of the department and brag! Haha, I was happy to think about it, so I stayed up all night and finished this Mini Program.

The difference between pictures and cartoons

First of all, let's take a look at the difference between comics and our photos, as shown in the following figure:

From the picture above, we can see that compared with the picture, the cartoon pays more attention to the details of the outline, the boundary outline is clearer, and the second is that the number of colors of the cartoon is less than that of the real picture. so it seems that cartoons are not as real as pictures for details.

two

Turn pictures into cartoons-- reduce colors

Picture to comic-color reduction with the description of the above two details, our next program will also focus on these two points. First of all, we need to reduce the number of colors, we use the oepncv library to implement. First of all, we use pyramid sampling to reduce the resolution of the picture and improve the blur of the original picture, and then use bilateral filtering to filter the picture continuously to further improve the blur of the picture. this achieves our goal of blurring. The purpose of using pyramid instead of interpolation to reduce the image resolution is to achieve the purpose of blurring, because the sampling under the pyramid will cause distortion; bilateral filtering can well preserve edge information and is friendly to the enhanced edges we mentioned above.

The following figure shows how the image resolution changes when the program reduces the number of colors:

The corresponding program is shown in the following figure:

In the above program, one thing we need to pay attention to is that for the input picture, we have to adjust the picture size to an integer multiple of 4, because in the process of sampling under the pyramid, the picture will be reduced to the original size by default. If it cannot be divided, the program will automatically round it up. In this way, after we upsample, there will be a slight difference in resolution between the blurred image and the original input picture. This will save the later programs.

three

Picture to cartoon-enhanced outline

After completing the above steps, we are going to enhance the outline. Our program is shown in the following figure:

In the above procedure, we use the adaptive threshold function of opencv to segment the contour, and then manipulate our outline picture and the blurred image according to the value of the outline picture, and finally get our cartoon picture.

The above is the core of the program, and then we use the famous frame flask program in Python to make a simple website page.

four

Flask makes a simple website.

For the flask program, we must have a certain understanding, we use the flask program is very simple, I briefly talk about ideas and steps:

First of all, when we run the program, the top interface in the following figure appears.

Then, after we select the picture and click to upload, the html page will jump to the sub-page of / cartoon and run the cartoon function in the background, as shown in the middle image.

At this point, the conversion of the picture is completed, and the address of the picture converted into a cartoon is returned to the html page.

The html page just needs to find this image and display it on the page, as shown in the bottom figure below.

Stayed up all night, is really too tired, the original is not easy, although the above site has been completed, but the page is very simple and needs further beautification! This article is just for you to throw a brick to attract jade, Python inside a lot of interesting library, you can do a lot of interesting things.

The above is the editor for you to share how to use Python to do a website to help little sister generate cartoon profile portrait, if you happen to have similar doubts, you might as well refer to the above analysis to understand. If you want to know more about it, you are welcome to follow the industry information channel.

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