Abstract: A line drawing region of an image is separated by determining a line drawing region of image data for each of at least one predetermined color using a color determination threshold for the predetermined color; and separating the line drawing region for each predetermined color from a region other than the line drawing region.

Abstract: In an image encoding apparatus, an image area separating section determines for each pixel whether an input original image is a line image or a plane image and outputs separation information representing a type of image for each pixel. A line image position information encoding section encodes the separation information and outputs coded line image position information. A line image generating section extracts a line image from the input original image on the basis of the separation information. A line image color information quantizing section quantizes the line image and outputs quantized line image color information. A line image color information encoding section encodes the quantized line image color information and outputs coded line image color information. A plane image generating section extracts a plane image from the input original image on the basis of the separation information. A plane image quantizing section quantizes the plane image and outputs quantized plane image information.

Abstract: A line segment detector includes a first weighted average section which calculates the weighted average of pixel values in a first detecting window. The detector also includes a second weighted average section which calculates the weighted average of pixel values in a second detection window. A differentiating section calculates the absolute value of a difference between the outputs of the first and second weighted average sections. A dot detecting section calculates the average of absolute differential values between pixels in a vertical line direction, a horizontal line direction, and diagonal directions set in a detection window in an area containing the target pixel.

Abstract: A data processing apparatus according to the invention is provided with a plurality of processors, a plurality of memories, a plurality of memory bus selectors each corresponding to a memory, and a control circuit. Each of the plurality of memories can be accessed by any of the plurality of processors through its corresponding memory bus selector. The control circuit establishes access routes between the plurality of memories and the plurality of processors by providing control signals to the memory bus selectors based on a requests from the processors.

Abstract: In an image encoding apparatus, an image area separating section determines for each pixel whether an input original image is a line image or a plane image and outputs separation information representing a type of image for each pixel. A line image position information encoding section encodes the separation information and outputs coded line image position information. A line image generating section extracts a line image from the input original image on the basis of the separation information. A line image color information quantizing section quantizes the line image and outputs quantized line image color information. A line image color information encoding section encodes the quantized line image color information and outputs coded line image color information. A plane image generating section extracts a plane image from the input original image on the basis of the separation information. A plane image quantizing section quantizes the plane image and outputs quantized plane image information.

Abstract: A line segment detector includes first and second weighted average sections, differentiating section, dot detecting section, and comparing section. The first weighted average section calculates the weighted average of the pixel values in the first detection window set in the first neighboring area of a target pixel. The second weighted average section calculates the weighted average of the pixel values in the second detection window set in the second neighboring area point symmetrical with the first neighboring area. The differentiating section calculates the absolute value of a difference between outputs from the first and second weighted average sections. The dot detecting section calculates the average of the absolute values of differential values between pixels in a direction of a vertical line, horizontal line, left-to-right downward slanting line, or left-to-right upward slanting line within the third detection window set in an area containing the target pixel.