Image Processing Apparatus Gamma Contrast Assist Display
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Solution Overview
Problem
In professional digital video camera use, the difference in latitude between recording and display images leads to highlight-detail loss and makes accurate exposure adjustment difficult due to the restricted latitude of the display image.
Innovation Solution
An image processing apparatus that generates recording and display image data based on different gamma characteristics, includes a determination unit to identify unexpressed luminance levels, and a display control unit to superimpose assist data on the display image, allowing users to confirm unexpressed tones and adjust exposure accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the display image uses a restricted gamma characteristic to match display unit performance, then the display image can be properly reproduced on the display unit, but the latitude difference between recording and display images causes highlight-detail loss and makes accurate exposure adjustment difficult
Solution Approach 1:
The patent introduces an assist display as an intermediary element that bridges the gap between recording image data and display image data. This assist display shows the relationship between the two different gamma characteristics, allowing users to see which luminance levels in the recording image will be lost in the display image, thereby enabling accurate exposure adjustment while maintaining proper display reproduction
Solution Approach 2:
The assist display uses visual differentiation (color or pattern changes) to indicate different luminance level relationships between recording and display images. By visually marking regions where tones cannot be expressed in the display image, the system provides intuitive feedback to users for accurate exposure control
2Adaptability or versatility
If the recording image maintains wide latitude using sensor performance, then smooth tones can be reproduced from dark to bright parts, but the display image has restricted latitude causing tones to be unexpressed
Solution Approach 1:
The system performs preliminary analysis by comparing recording image data with display image data before final display. The assist display is generated in advance to show users which luminance levels will be lost, allowing them to adjust exposure settings before recording or during review, thereby preventing irreversible tone information loss
Data Source
AI summary
An image processing apparatus comprises a recording image generation unit which generates recording image data from image data input by an image input unit, based on a first gamma characteristic; a display image generation unit which generates display image data from the image data based on a second gamma characteristic in correspondence with a characteristic of a display unit; a determination unit which determines whether or not the recording image data includes a portion of luminance levels which are not less than a predetermined threshold; a display data generation unit which generates display data for indicating the portion of the luminance levels which are not less than the predetermined threshold; and a display control unit which superimposes the display data on the display image data.