Selective Alpha Blending in Image Rendering
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Solution Overview
Problem
Existing image rendering technologies require significant computational resources due to alpha blending, especially when handling images with a mix of transparent, opaque, and translucent pixels, as they perform unnecessary calculations for all pixels regardless of their opacity values.
Innovation Solution
An image processing apparatus that selectively performs alpha blending only on pixels with different opacity values, omitting the process for pixels with specific alpha values, thereby optimizing rendering by distinguishing between active and inactive regions based on alpha channel data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If alpha blending is performed on all pixels regardless of opacity values, then accurate color representation is maintained, but computational overhead increases significantly
Solution Approach 1:
The patent applies different rendering treatments to different regions of the image based on local alpha channel characteristics. Specifically, it identifies and processes only those pixel regions where alpha blending is actually necessary (where foreground and background both have non-zero alpha values), while skipping regions where blending would be redundant. This local differentiation resolves the contradiction by maintaining color accuracy only where needed while improving overall rendering speed.
Solution Approach 2:
Instead of performing alpha blending on all pixels (excessive action), the patent performs blending only on the subset of pixels that require it (partial action). The rendering unit selectively applies blending operations to regions identified by the alpha channel analysis, avoiding unnecessary computations on pixels where the foreground is completely opaque or the background is completely transparent. This partial action approach maintains necessary color accuracy while significantly reducing computational overhead.
2Productivity
If alpha blending is omitted for all pixels, then computational overhead is reduced, but rendering accuracy deteriorates for pixels requiring blending
Solution Approach 1:
The patent implements local quality control by analyzing the alpha channel to identify specific regions where blending is necessary. The rendering unit then applies blending operations selectively to these identified regions while omitting them elsewhere. This ensures that rendering speed is improved through selective processing while color representation accuracy is maintained in the critical regions where foreground and background both contribute to the final pixel color.
3Measurement precision
If alpha blending is performed on translucent pixels, then accurate transparency effects are achieved, but processing time increases
Solution Approach 1:
The patent applies partial action by performing alpha blending only on the specific subset of translucent pixels that actually require blending based on their alpha values and the corresponding background pixel states. Rather than processing all translucent pixels uniformly, the rendering unit intelligently identifies and processes only those pixels where blending will produce the correct transparency effect, thereby reducing processing time while maintaining accuracy for the relevant pixels.
Data Source
AI summary
An image processing apparatus includes an acquisition unit configured to acquire a bitmap image in which each of contained pixels has an alpha value indicating opacity of this pixel, and a rendering unit configured to render the bitmap image. The rendering unit is configured to, when rendering the bitmap image, refrain from performing alpha blending on a pixel contained in the bitmap image that has a specific alpha value and perform the alpha blending on a pixel contained in the bitmap image that has a different alpha value from the specific alpha value.