Image processing apparatus and method thereof
AssigneeCanon Kabushiki Kaisha
InventorTadashi Ohira
Life of this patent
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Abstract
The intensities of horizontal and vertical edges of each block of luminance signals of an image are measured, and horizontal and vertical edge intensity data of respective blocks are stored for one frame in an edge intensity mapping memory. A noise removal flag used to specify a filtering block is calculated based on the edge intensity data, and is stored in a noise removal flag mapping memory. A filter controller controls whether or not to apply filtering processing to each block, specified by this noise removal flag, of the current frame of the image based on the horizontal and vertical edge intensity data of that block of the current frame and those of the corresponding block of the immediately preceding frame.
Claims9
An image processing apparatus comprising:
- a measuring unit configured to acquire edge intensity information by dividing an image into a plurality of blocks and measuring an edge of an image in each block;
- a storage unit configured to store the edge intensity information of respective blocks for at least one frame;
- a determination unit configured to determine a block to be filtered based on the edge intensity information of the respective blocks stored in said storage unit;
- and
- a control unit configured to determine whether or not to apply filtering processing to a first block, which is determined by said determination unit as the block to be filtered, of a current frame of the image based on the edge intensity information of the first block in the current frame acquired by said measuring unit, and edge intensity information of a second block corresponding to the first block in an immediately preceding frame of the current frame, which is stored in said storage unit.
An image processing apparatus comprising:
- a measuring unit configured to acquire edge intensity information by dividing an image into a plurality of blocks and measuring an edge of an image in each block;
- and
- a control unit configured to determine whether or not to apply filtering processing to each block of the current frame of the image, based on the edge intensity information of each block of the current frame acquired by said measuring unit, and the edge intensity information of a corresponding block of an immediately preceding frame of the current frame.
An image processing method comprising the steps of:
- acquiring edge intensity information by dividing an image into a plurality of blocks and measuring an edge of an image in each block;
- storing, in a memory, the edge intensity information of respective blocks for at least one frame;
- determining a block to be filtered based on the edge intensity information of the respective blocks stored in the memory;
- and
- determining whether or not to apply filtering processing to a first block, which is determined in said determining step as the block to be filtered, of a current frame of the image, based on the edge intensity information of the first block in the current frame acquired in said acquiring step, and edge intensity information of a second block corresponding to the first block in an immediately preceding frame of the current frame, which is stored in the memory.
Dependencies are inferred from the claim text.