Difference image generation device, difference image generation method, and computer readable media
AssigneeRenesas Electronics Corporation
InventorIsao Sezaki
Life of this patent
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Abstract
One exemplary embodiment includes a difference image generation device including a measurement unit and a scaling unit. The measurement unit measures a variation width of pixel values of a difference image signal obtained by performing subtraction processing on first and second input image signals. The scaling unit scales each pixel value of the difference image signal based on a measurement result of the variation width so that the difference image signal can be represented in grayscale using a predetermined bit width, and outputs a difference image signal subjected to scaling.
Claims19
A difference image generation device comprising:
- a measurement unit that measures a variation width of pixel values of a difference image signal obtained by performing subtraction processing on first and second input image signals;
- and
- a scaling unit that performs a scaling operation on each pixel value of the difference image signal based on a measurement result of the variation width so that the difference image signal can be represented in grayscale using a predetermined bit width, and outputs a difference image signal subjected to the scaling;
- wherein the measurement unit calculates the variation width based on a maximum value and a minimum value of the difference image signal measured within a predetermined signal range of the first and second input image signals.
A difference image generation method comprising:
- measuring, by a measurement unit, a variation width of pixel values of a difference image signal obtained by performing subtraction processing on first and second input image signals;
- and
- scaling, by a scaling unit, each pixel value of the difference image signal based on a measurement result of the variation width so that the difference image signal can be represented in grayscale using a predetermined bit width;
- wherein the measuring includes calculating the variation width based on a maximum value and a minimum value of the difference image signal measured within a predetermined signal range of the first and second input image signals.
A tangible computer readable medium embodying instructions for causing a computer system to perform a difference image generation method, the method comprising:
- measuring a variation width of pixel values of a difference image signal obtained by performing subtraction processing on first and second input image signals;
- and
- scaling each pixel value of the difference image signal based on a measurement result of the variation width so that the difference image signal can be represented in grayscale using a predetermined bit width;
- wherein the measuring includes calculating the variation width based on a maximum value and a minimum value of the difference image signal measured within a predetermined signal range of the first and second input image signals.
Dependencies are inferred from the claim text.