Picture Signal Processing Circuit for Viewfinder Focus Accuracy
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Solution Overview
Problem
Current imaging devices face challenges in displaying high-resolution images on viewfinders, leading to reduced focus accuracy due to down-converted pixel sizes, making it difficult to bring subjects into focus at original resolution.
Innovation Solution
Implementing a picture signal processing circuit that allows switching between two display modes, where high-frequency components are removed in one mode and original signals are used in another, enabling accurate focus confirmation and high-resolution imaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If picture size is down-converted to match viewfinder monitor display capabilities, then the viewfinder can display the picture, but focus accuracy deteriorates due to loss of high-frequency components
Solution Approach 1:
The display system is segmented into two distinct modes: a first display mode that applies filter processing to remove high-frequency components for general viewing, and a second display mode that outputs original high-resolution picture signals for focus confirmation. This segmentation allows each mode to optimize for its specific purpose without compromise.
Solution Approach 2:
The system dynamically switches between two display modes based on operational needs. The switching unit enables transition between the filtered first display mode and the original signal second display mode, allowing the display characteristics to adapt to the current task—whether general viewing or focus adjustment.
2Ease of operation
If high-resolution picture signals are processed through filtering to reduce pixel count, then display on viewfinder is enabled, but original resolution information is lost
Solution Approach 1:
The system prepares two versions of picture signals in advance: filtered signals for standard display and original unfiltered signals for focus confirmation. By pre-maintaining both signal versions, the system ensures that high-resolution information is preserved and readily available when needed, without requiring reprocessing.
Solution Approach 2:
The switching unit acts as an intermediary that selects between filtered and original picture signals based on display mode requirements. This mediator ensures that the appropriate signal version reaches the display unit, preserving resolution information while enabling flexible display operation.
3Device complexity
If a single display mode is used for both focus confirmation and general viewing, then device complexity is reduced, but focus accuracy and imaging quality deteriorate
Solution Approach 1:
The display unit serves multiple functions through two distinct modes: it displays filtered pictures for general viewing and original high-resolution pictures for focus confirmation. This multi-functionality allows a single display unit to fulfill both casual viewing and precise focus adjustment requirements without needing separate display devices.
Data Source
AI summary
A picture signal processing circuit includes a filter unit, a memory and a main control unit. When a display operates in a first display mode, the filter unit removes high-frequency components from first picture signals supplied in a first picture size from an imaging device, to provide second picture signals. When the display operates in a second display mode, the picture signals are provided unchanged. The memory stores the first and second picture signals, reads out the second picture signals, changes the second picture signals from a first picture size to a second picture size and supplies those second picture signals to the display when the display operates in the first display mode. The first picture signals corresponding to a picture clipped from the first picture size to the second picture size are read out to the display when the display operates in the second display mode. The main control unit controls switching between the first picture signals and the second picture signals from the memory according to whether the first or second display mode is selected.