Single Clock Image Zooming Circuit Design
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Solution Overview
Problem
Conventional image zooming devices require multiple clock domains, increasing circuit complexity due to the need for different operating circuits and methods for magnifying and shrinking images.
Innovation Solution
A method and device that utilize a single clock signal to alter the size of image frames by multiplying the frequency of the horizontal sync signal to generate an operating clock, sampling the source image frame, and performing horizontal and vertical zooming operations to produce a destination image frame, simplifying the circuit by using a single clock for all operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple clock domains are used for image zooming operations, then the image zooming functionality is achieved, but the circuit complexity increases
Solution Approach 1:
The patent merges multiple clock domains into a single clock domain by using one master clock signal to control all image processing operations. The processing unit performs sampling, horizontal zooming, and vertical zooming operations all synchronized to the same clock signal, eliminating the need for separate clock domains and reducing circuit complexity while maintaining full zooming functionality.
Solution Approach 2:
The processing unit is designed to perform multiple functions (sampling, horizontal zooming, vertical zooming) within a single clock domain. The same processing unit handles all zooming operations using a single clock signal, making the circuit universal and multi-functional rather than requiring dedicated circuits for each zooming operation.
2Manufacturing precision
If different operating circuits are used for magnifying and shrinking images, then the zooming precision is improved, but the device complexity increases
Solution Approach 1:
The patent uses dynamic control within a single clock domain to achieve both magnifying and shrinking operations. The processing unit dynamically adjusts its operation based on the desired zoom level, using the same clock signal and circuitry to perform both enlargement and reduction operations with high precision, eliminating the need for separate static circuits for each function.
Data Source
AI summary
A method for zooming images is provided. The method is suitable for altering the size of a source image frame in both horizontal and vertical directions to generate a destination image frame. The method for zooming images includes the following steps. First, the frequency of a horizontal sync signal is multiplied to generate an operating clock signal, wherein the horizontal sync signal is synchronized with the source image frame. Next, the source image frame is sampled by the operating clock signal to generate a sampled image frame. Then, a horizontal zooming operation is performed on the sampled image frame by using the operating clock signal to generate a horizontal image frame. Afterwards, a vertical zooming operation is performed on the horizontal image frame by using the operating clock signal to generate a vertical image frame. Finally, the vertical image frame is output as the destination image frame.