Image processing device and image processing method

An image processing device, comprising:

• a storing part storing image data of an input image signal;
• a clock generating part generating a predetermined clock signal according to the resolution of the image to be output;
• and
• a control part that:
• detects periods of a horizontal synchronization signal and a vertical synchronization signal which are in synchronization with the input image signal,
• determines a magnification for an image to be output, from a horizontal synchronization interval and a vertical synchronization interval of the image to be output, and the periods of the horizontal synchronization signal and vertical synchronization signal which are in synchronization with the input image signal,
• controls timing of reading the image data from said storing part according to the thus-determined magnification,
• reads the image data from said storing part in synchronization with the clock signal generated by said clock generating part,
• counts an interval obtained as a result of a vertical blanking interval being removed from one frame of the image signal, using the clock signal generated by said clock generating part,
• sets, as a horizontal blanking interval for the image to be output, a value obtained from dividing a thus-obtained count value by a resolution in the vertical direction for the image to be output, and subtracting a resolution in the horizontal direction for the image to be output from a division result, and
• reads the image data from said storing part according to the thus-set horizontal blanking interval and the magnification.

An image processing method, comprising:

• a) storing image data of an input image signal in a storing part;
• and
• b) detecting a resolution of the image data from a synchronization signal which is in synchronization with the input image signal, and, controlling timing of reading the image data from said storing part according to the thus-detected resolution, and
• said b) comprising
• b-1) using a data enable signal as the synchronization signal which is in synchronization with the input image signal;
• b-2) detecting the number of data enable signal pulses within one frame of the input image signal in the data enable signal;
• b-3) determining, as a magnification in a vertical direction, a value obtained as a result of a resolution in the vertical direction of an image to be output being divided by the thus-detected number of data enable signal pulses within one frame;
• b-4) using a clock signal which is in synchronization with the reading timing for the image data;
• b-5) counting a pulse width of the data enable signal by using the clock signal;
• b-6) determining a value obtained as a result of a resolution in a horizontal direction of the image to be output being divided by a thus-obtained count value, as a magnification in the horizontal direction;
• and
• b-7) controlling the timing of reading the image data from said storing part according to the thus-obtained magnification in the vertical direction and magnification in the horizontal direction.

An image processing method, comprising:

• a) storing image data of an input image signal in a storing part;
• b) detecting periods of a horizontal synchronization signal and a vertical synchronization signal which are in synchronization with the input image signal;
• c) determining a magnification for an image to be output, from a horizontal synchronization interval and a vertical synchronization interval of the image to be output, and the periods of the horizontal synchronization signal and vertical synchronization signal which are in synchronization with the input image signal;
• d) controlling timing of reading the image data from said storing part according to the thus-determined magnification;
• e) generating a predetermined clock signal according to the resolution of the image to be output;
• f) reading the image data from said storing part in synchronization with the clock signal generated by said clock generating part;
• g) counting an interval obtained as a result of a vertical blanking interval being removed from one frame of the image signal, using the clock signal generated by said clock generating part;
• h) setting, as a horizontal blanking interval for the image to be output, a value obtained from dividing a thus-obtained count value by a resolution in the vertical direction for the image to be output, and subtracting a resolution in the horizontal direction for the image to be output from a division result;
• and
• i) reading, in said f), the image data from said storing part according to the thus-set horizontal blanking interval and the magnification.