Image processing apparatus that performs tone correction and edge enhancement, control method therefor, and storage medium

An image processing apparatus comprising:

• a first correction unit configured to multiply a signal of a target pixel in image data by gain based on values obtained by reflecting signals of pixels around the target pixel;
• a gamma conversion unit configured to, for signal of the target pixel output from said first correction unit, perform gamma conversion based on the signal of the target pixel;
• an edge extraction unit configured to extract an edge signal from the image data;
• a second correction unit configured to multiply the edge signal corresponding to the target pixel by a gain based on a signal of the image data;
• and
• an adding unit configured to add the edge signal output from said second correction unit to a signal output from said gamma conversion unit,
• wherein based on an amount of correction specified by user operation, said first correction unit selects a corresponding table from a plurality of tables prepared in advance and performs multiplication using a gain based on the selected table, and
• said second correction unit performs multiplication using a gain adjusted using the selected table.

A control method for an image processing apparatus, comprising:

• a first correction step of multiplying a signal of a target pixel in image data by a gain based on values obtained by reflecting signals of pixels around the target pixel;
• a gamma conversion step of, for signal of the target pixel obtained in said first correction step, carrying out gamma conversion based on the signal of the target pixel;
• an edge extraction step of extracting an edge signal from the image data;
• a second correction step of multiplying the edge signal corresponding to the target pixel by a gain based on a signal obtained in said first correction step;
• and
• an adding step of adding the edge signal extracted in said second correction step to a signal obtained in said gamma conversion step.

A control method for an image processing apparatus, comprising:

• a first correction step of multiplying a signal of a target pixel in image data by a gain based on values obtained by reflecting signals of pixels around the target pixel;
• a gamma conversion step of, for signal of the target pixel obtained in said first correction step, performing gamma conversion based on the signal of the target pixel;
• an edge extraction step of extracting an edge signal from the image data;
• a second correction step of multiplying the edge signal corresponding to the target pixel by a gain based on a signal of the image data;
• and
• an adding step of adding the edge signal obtained in said second correction step to a signal obtained in said gamma conversion step,
• wherein in said first correction step, a corresponding table is selected from a plurality of tables prepared in advance based on an amount of correction specified by user operation, and multiplication is performed using a gain based on the selected table, and
• in said second correction step, multiplication is performed using a gain adjusted using the selected table.

A non-transitory computer-readable storage medium storing a program for causing a computer to execute a control method for an image processing apparatus, the control method comprising:

• a first correction step of multiplying a signal of a target pixel in image data by a gain based on values obtained by reflecting signals of pixels around the target pixel;
• a gamma conversion step of, for signal of the target pixel obtained in the first correction step, carrying out gamma conversion based on the signal of the target pixel;
• an edge extraction step of extracting an edge signal from the image data;
• a second correction step of multiplying the edge signal corresponding to the target pixel by a gain based on a signal obtained in the first correction step;
• and
• an adding step of adding the edge signal extracted in the second correction step to a signal obtained in the gamma conversion step.

A non-transitory computer-readable storage medium storing a program for causing a computer to execute a control method for an image processing apparatus, the control method comprising:

• a first correction step of multiplying a signal of a target pixel in image data by a gain based on values obtained by reflecting signals of pixels around the target pixel;
• a gamma conversion step of, for signal of the target pixel obtained in the first correction step, performing gamma conversion based on the signal of the target pixel;
• an edge extraction step of extracting an edge signal from the image data;
• a second correction step of multiplying the edge signal corresponding to the target pixel by a gain based on a signal of the image data;
• and
• an adding step of adding the edge signal obtained in the second correction step to a signal obtained in the gamma conversion step,
• wherein in the first correction step, a corresponding table is selected from a plurality of tables prepared in advance based on an amount of correction specified by user operation, and multiplication is performed using a gain based on the selected table, and
• in the second correction step, multiplication is performed using a gain adjusted using the selected table.