Image Processing Device Asynchronous Frame Data Segmentation
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Solution Overview
Problem
Conventional image processing methods with double-buffer structures in display memory increase latency and require significant storage capacity, limiting asynchronous drawing and output processes due to restricted Vertical Blank Interval (VBI) timing.
Innovation Solution
An image processing device that divides frame data into partial data units and stores them in a display memory with multiple buffer areas, allowing for asynchronous saving, transformation, and output processes outside the VBI interval, while minimizing the increase in display memory storage capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a double-buffer structure is used in the display memory, then it becomes possible to carry out saving and transformation processes outside the VBI interval and enable asynchronous drawing and output, but the storage capacity of the display memory needs to be at least twice the capacity of the frame buffer
Solution Approach 1:
The frame data is divided into multiple partial data units (e.g., first partial data, second partial data, third partial data) that can be saved and output independently. This segmentation allows the display memory to store only a fraction of the complete frame data at any given time, enabling asynchronous operations without requiring full double-buffer capacity.
Solution Approach 2:
The system outputs partial data units before the entire frame data is saved to the display memory. For example, the first partial data can be output while the second and third partial data are still being saved. This partial action approach reduces the memory capacity requirement while maintaining productivity.
2Productivity
If a double-buffer structure is used in the display memory, then it becomes possible to carry out saving and transformation processes outside the VBI interval, but latency increases
Solution Approach 1:
The frame data is divided into multiple partial data units that can be saved to the display memory in advance of when they are needed for output. This preliminary action allows the system to prepare data for future output operations without waiting for complete frame saving, thereby reducing latency while enabling processes outside the VBI interval.
3Quantity of substance
If saving and transformation processes are limited to the VBI interval, then storage capacity requirements are reduced, but the size and definition of displayable image are limited
Solution Approach 1:
By segmenting frame data into multiple partial data units, the system can progressively save and transform data during both VBI and active display intervals. This enables larger and higher-definition images to be processed and displayed without requiring the entire frame to be saved within the limited VBI window, thus expanding display capabilities while maintaining reasonable memory requirements.
Data Source
AI summary
Provided is an image processing device for outputting a graphic image drawn into a frame memory after saving the image in a display memory. The image processing device is provided with a save processing section for saving frame data representing a predetermined image from a graphic memory in which the frame data is stored to a display memory, and an output interface for outputting the frame data saved in the display memory by transforming the frame data into a video output signal. The save processing section saves the frame data from the graphic memory to the display memory in equally divided units (partial data units). The partial data units of the frame data are outputted from the display memory.