Data processing apparatus

A data processing apparatus comprising:

• image data generating means for generating image data of a first density;
• converting means for converting the first density image data generated by said image data generating means into image data of a second density;
• and
• discriminating means for discriminating whether the first density image data represents a character image or a picture image,
• wherein said converting means has at least first and second conversion modes which are different, and
• wherein in the first conversion mode said converting means converts the first density image data into the second density image data with smoothing such that notches in oblique lines of the image data are smoothed, and
• wherein in the second conversion mode said converting means converts the first density image data into the second density image data without smoothing, and
• wherein in a case where said discriminating means discriminates that the first density image data represents a character image, said converting means converts the first density image data into second density image data utilizing the first conversion mode, and in a case where said discriminating means discriminates that the first density image data represents a picture image, said converting means converts the first density image data into second density image data utilizing the second conversion mode.

A data processing apparatus comprising:

• input means for inputting pixels of binary image data of a first density;
• storage means for storing plural lines of binary image data input by said input means;
• detecting means for detecting a right-angled part of the first density binary image data;
• smoothing means for producing smoothed binary image data of a second density higher than the first density, said smoothing means smoothing a notch pattern in the first density binary image data on the basis of a state of a pattern formed by plural pixels of the first density binary image data stored in said storage means;
• and
• inhibit means for inhibiting a smoothing process of said smoothing means in a case where said detecting means detects the right-angled part.

A recording apparatus comprising:

• input means for inputting plural lines of information of a first density;
• laser beam modulating means for modulating a laser beam;
• output means for outputting a signal for scanning the laser beam in a sub-scan direction at a second density n times (n.gtoreq.2) as high as the first density;
• forming means for forming an image onto a photosensitive drum on the basis of the laser beam;
• beam detect means for detecting a scan position of the laser beam in a main scan direction;
• storage means for storing M.times.N bits of the inputted information wherein M is a number of dots in the main scan direction and N is a number of lines in the sub-scan direction;
• information converting means for discriminating a characteristic of the information stored in said storage means and for converting a line of first density information into smoothed information of a third density in which notches in lines oblique to the main scan and sub-scan directions are smoothed, the second density being m times (m>2) as high as the first density in the main scan direction and the third density being higher than the second density;
• and
• control means for controlling said information converting means to execute sequentially the conversion of the plural lines of information input by said input means in accordance with the scan position detected by said beam detect means.