Image signal processing apparatus and image signal processing method

An image signal processing apparatus, comprising:

• a low pass filter part that performs a spatial low pass filter processing on a first image signal that is an input image;
• an image processing part for high resolution that generates a second image signal by performing an image processing for high resolution on an image after the low pass filter processing;
• a first difference absolute value calculating part that calculates a difference absolute value between a pixel value of the first image signal and a pixel value of an image signal after the low pass filter processing;
• a second difference absolute value calculating part that calculates a difference absolute value between a pixel value of an image signal after the low pass filter processing and a pixel value of the second image signal;
• a comparison part that compares the first difference absolute value with the second difference absolute value;
• and
• a selection part that selects either of the first image signal that is an input image signal and the second image signal based on a comparison result of the comparison part.

An image signal processing method, comprising:

• a low pass filter processing step of performing a spatial low pass filter processing on a first image signal that is an input image;
• a high resolution image producing step of generating a second image signal by performing an image processing for high resolution on an image after the low pass filter processing;
• and
• a comparison/selection step of comparing corresponding regions in the first image signal and the second image signal and selecting either of the first image signal and the second image signal with respect to the regions based on this comparison result.

An image signal processing method, comprising:

• a low pass filter processing step of performing spatial low pass filter processing on a first image signal that is an input image;
• a high resolution image producing step of generating a second image signal by performing an image processing for high resolution on an image after the low pass filter processing;
• a first difference absolute value calculating step of calculating a difference absolute value between a pixel value of the first image signal and a pixel value of an image signal after the low pass filter processing;
• a second difference absolute value calculating step of calculating a difference absolute value between a pixel value of an image signal after the low pass filter processing and a pixel value of the second image signal;
• a comparison step of comparing the first difference absolute value with the second difference absolute value;
• and
• a selection step of selecting either of the first image signal that is an input image signal and the second image signal based on a comparison result of the comparison part.