Animal Face Style Generation With Keypoint Alignment

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Solution Overview

Problem

Conventional video interactive applications only support limited types of image style transformations, leading to a poor user experience and inability to meet personalized user requirements for image style transformation.

Innovation Solution

A method and apparatus for generating animal face style images by determining the correspondence between animal and human face key points, performing human face position adjustment, and using a pre-trained animal face style image generation model to transform human faces into animal faces, while enriching image editing functions and enhancing user experience.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If conventional image style transformation methods are used, then the transformation process is simple, but the types of style transformations are limited

Engineering Contradiction:
Improvetypes of style transformationsVSAvoidtransformation system complexity
Core Design Contradiction:
Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent segments the image transformation process into multiple specialized models: a face recognition model for detecting human faces, an animal face style generation model for transforming faces into animal styles, and an image fusion model for combining results. This segmentation allows each model to specialize in one aspect, enabling diverse style transformations while maintaining manageable system complexity through modular architecture.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The patent creates a universal transformation framework that can handle multiple animal face styles (cat, dog, rabbit, etc.) through a single multi-functional system. The animal face style generation model is designed to work with various animal types by learning from diverse training pairs, making the system adaptable to different style transformation requirements without needing separate specialized models for each animal type.

Inventive Principle:
Principle #6Universality (Multi-functionality)

2Manufacturing precision

If a pre-trained animal face style image generation model is used, then the transformation accuracy is improved, but the model training complexity increases

Engineering Contradiction:
Improvetransformation accuracyVSAvoidmodel training complexity
Core Design Contradiction:
Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent applies preliminary action by pre-training the animal face style generation model with carefully constructed training pairs before deployment. The training process involves preparing paired images of human faces and corresponding animal faces in advance, and the model is pre-trained on these pairs to learn the transformation mappings. This preliminary training ensures high transformation accuracy when the model is used, while the complex training work is completed beforehand rather than during runtime.

Inventive Principle:
Principle #10Preliminary action

Solution Approach 2:

The patent uses copying by creating training pairs where animal face images are generated or selected to correspond with human face images. These training pairs serve as templates that the model learns from, copying the structural and feature relationships between human and animal faces. This copying approach allows the model to achieve high accuracy by learning from representative examples without needing to understand the underlying biological complexities.

Inventive Principle:
Principle #26Copying

3Manufacturing precision

If key point correspondence and face position adjustment are performed, then the transformation precision is improved, but the processing time increases

Engineering Contradiction:
Improveface alignment precisionVSAvoidprocessing time
Core Design Contradiction:
Manufacturing precisionVSLoss of time

Solution Approach 1:

The patent applies preliminary action by performing face key point detection and position adjustment as preliminary steps before the actual style transformation. The face recognition model first identifies face locations and key points, and the system adjusts face positions to standard orientations. These alignment operations are completed beforehand to ensure that subsequent transformation operations work on properly positioned faces, improving overall precision while allowing the main transformation model to focus on style transfer rather than alignment.

Inventive Principle:
Principle #10Preliminary action

Data Source

PatentEP4246425B1Animal face style image generation method and apparatus, model training method and apparatus, and device
Publication Date: 2025.12.31 BEIJING ZITIAO NETWORK TECH CO LTD
  • EP4246425B1 patent drawingFigure 1~2
  • EP4246425B1 patent drawingFigure 3~4
  • EP4246425B1 patent drawingFigure 5~6

AI summary

An animal face style image generation method and apparatus, a model training method and apparatus, and a device. The generation method comprises: obtaining an original human face image (S 101); and using a pre-trained animal face style image generation model to obtain an animal face style image corresponding to the original human face image (S 102); the animal face style image being an image obtained by converting a human face on the original human face image into an animal face, the animal face style image generation model being obtained by training based on a first human face sample image and a first animal face style sample image, the first animal face style sample image being generated by a pre-trained animal face generation model on the basis of the first human face sample image, and the animal face generation model being obtained by training based on a second human face sample image and a first animal face sample image. By means of method, image editing functions in a terminal can be enriched, interestingness of video interactive applications is improved, and a special effect playing method is provided for a user.