Optical Fingerprint Capture Interrupt Timing for Processing Speed
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Solution Overview
Problem
Conventional optical fingerprint recognition systems experience increased total processing time due to the timing of interrupt requests and data reading from the data buffer, which can be inefficient when handling large amounts of pixel data.
Innovation Solution
The proposed operating method for an optical fingerprint capture apparatus involves entering an exposure mode upon receiving a scan command, followed by a sample mode where pixel data is written to a data buffer, and then outputting an interrupt request at a predetermined time point later than the start but earlier than the end of the sample mode to initiate data reading by the host.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the optical fingerprint capture apparatus outputs the interrupt request upon completion of writing multiple pieces of pixel data to the data buffer, then the host can read all pixel data, but the total processing time increases
Solution Approach 1:
The patent applies preliminary action by outputting the interrupt request at a predetermined time point during the sample mode (before the end of sampling), rather than waiting for complete data acquisition. This allows the host to start reading pixel data from the data buffer in advance, overlapping the reading process with the ongoing sampling process, thereby reducing the total processing time without compromising data integrity
2Productivity
If the host starts reading pixel data after the interrupt request is output at the end of sample mode, then data integrity is ensured, but processing efficiency decreases
Solution Approach 1:
The interrupt request is output at a predetermined time point that is later than the start of the sample mode and earlier than the end of the sample mode, enabling the host to begin reading pixel data before sampling completes. This preliminary action maintains data reliability through proper timing coordination while significantly improving processing efficiency by eliminating idle waiting time
Solution Approach 2:
The patent enables continuous operation by overlapping the data reading process with the ongoing sampling process. The host reads pixel data from the data buffer while the image sensor continues to sample, ensuring that no time is wasted and both processes occur simultaneously, thereby maintaining system productivity and reliability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows the host to start reading pixel data from the buffer before the end of the sample mode, thereby reducing the overall processing time of the optical fingerprint recognition system, especially when dealing with large amounts of data.
Implementation Method 1
entering an exposure mode where an image sensor thereof is exposed to light carrying information of a fingerprint
Data Source
AI summary
An operating method of an optical fingerprint capture apparatus includes: by the apparatus upon receipt of a scan command from a host, entering an exposure mode where an image sensor thereof is exposed to light carrying information of a fingerprint; by the apparatus upon complete exposure of the image sensor to the light, entering a sample mode where multiple pieces of pixel data that cooperatively represent an image of the fingerprint are obtained and written to a data buffer thereof; and by the apparatus at a predetermined output time point that is later than a start of the sample mode and earlier than an end of the sample mode, outputting an interrupt request to cause the host to start reading the pieces of pixel data from the data buffer.