Image processing apparatus, image processing method and electronic camera
AssigneeNikon Corporation
InventorAkihiko UTSUGI
Life of this patent
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Abstract
An image processing apparatus includes a clip part and an incremental processing part. The clip part sets a threshold value as an output luminance value of a process object pixel when a luminance value of the process object pixel of an image data having luminance values of a plurality of pixels is less than the threshold value set in advance. The incremental processing part finds and holds an incremental value of the output luminance value relative to the luminance value of the process object pixel, and finds the output luminance value of the process object pixel by subtracting the incremental value from the luminance value when the luminance value of the process object pixel is the threshold value or more.
Claims19
An image processing apparatus, comprising:
- a clip part setting a threshold value as an output luminance value of a process object pixel when a luminance value of the process object pixel of an image data having luminance values of a plurality of pixels is less than the threshold value set in advance;
- and
- an incremental processing part finding and holding an incremental value of the output luminance value relative to the luminance value of the process object pixel, and subtracting the incremental value from the luminance value to find the output luminance value of the process object pixel when the luminance value of the process object pixel is the threshold value or more.
An image processing method executable on a computer, comprising:
- setting a threshold value as an output luminance value of a process object pixel when a luminance value of the process object pixel of an image data having luminance values of a plurality of pixels is less than the threshold value set in advance;
- finding an incremental value of the output luminance value relative to the luminance value of the process object pixel;
- holding the found incremental value as a variable;
- and
- finding the output luminance value of the process object pixel by subtracting the incremental value held as the variable from the luminance value when the luminance value of the process object pixel is the threshold value or more.
Dependencies are inferred from the claim text.