Image transmitter and image receiver

An image transmitter for transmitting image data to a device connected by a data signal line, the image transmitter comprising:

• an image data retention unit for storing the image data to be transmitted;
• a pixel value retention unit for storing a pixel value read from the image data retention unit;
• a subtraction processing unit for sequentially reading the pixel value of an adjacent pixel of the image data from the image data retention unit, obtaining, every time the pixel value is read, data of a difference between the read pixel value and the pixel value retained in the pixel value retention unit, and overwriting the pixel value retained in the pixel value retention unit with the pixel value read from the image data retention unit;
• a difference data conversion unit for converting the difference data obtained by the subtraction processing unit to transmission data, wherein the closer the value of the difference data to 0, the smaller the number of signal changes when the transmission data converted by the difference data conversion unit is expressed as a binary number;
• and
• a data transmission unit for sequentially outputting a data signal expressing the transmission data as the binary number to the data signal line, the transmission data converted by the difference data conversion unit.

An image receiver for receiving image data from a device connected by a data signal line by receiving pixel values composing the image data as a data signal obtained by converting a difference between mutually adjacent pixels to transmission data, the image receiver comprising:

• a data reception unit for receiving the data signal transmitted via the data signal line;
• a pixel value retention unit for storing a pixel value obtained from the data signal transmitted via the data signal line;
• a difference data reverse conversion unit for carrying out reverse conversion of conversion carried out in the device of a transmitter with respect to the data signal received by the data reception unit so as to obtain data of a difference from a pixel received immediately before the received data signal;
• and
• an addition processing unit for adding the obtained difference data and the immediately-before pixel value retained in the pixel value retention unit every time the data of the difference from the immediately-before pixel is obtained by the difference data reverse conversion unit so as to obtain a pixel value according to the data signal received by the data reception unit and overwriting the pixel value retained in the pixel value retention unit with the obtained pixel value;
• wherein
• the image data is generated by the pixel value obtained by the addition processing unit.

An image receiver for receiving image data from a device connected by a data signal line by receiving a data signal, the data signal expressing each pixel value composing the image data by a difference between mutually adjacent pixels, the data signal obtained by converting the difference between the mutually adjacent signals to transmission data, the data signal received as the transmission data in which the value of each bit of a next data signal is inverted if a least significant bit of a data signal immediately before the data signal is “1”;

• the image receiver comprising:
• a data reception unit for receiving the data signal transmitted via the data signal line;
• a pixel value retention unit for storing the pixel value obtained from the data signal transmitted via the data signal line;
• a data inversion unit for inverting the value of each bit of the data signal received next by the data reception unit if the least significant bit of the data signal received immediately before by the data reception unit is “1”;
• a difference data reverse conversion unit for subjecting the received data signal or, if a data inversion process is carried out, the inverted data signal to reverse conversion of conversion carried out in the device of a transmitter every time the data signal is received by the data reception unit so as to obtain the data of the difference from the pixel received immediately before;
• and
• an addition processing unit for adding the obtained difference data and the immediately-before pixel value retained in the pixel value retention unit every time the data of the difference from the immediately-before pixel is obtained by the difference data reverse conversion unit so as to obtain the pixel value according to the data signal received by the data reception unit and overwriting the pixel value retained in the pixel value retention unit with the obtained pixel value;
• wherein
• the image data is generated by the pixel value obtained by the addition processing unit.

An image transmitting method for transmitting image data by an image transmitter to a device connected by a data signal line;

• the method comprising:
• a step of causing the image transmitter to read the image data from an image data retention unit storing the image data to be transmitted and obtain data of a difference between mutually adjacent pixels of the image data;
• and
• a step of causing the image transmitter to sequentially output a data signal to the data signal line in accordance with an arrangement of the pixels, the data signal expressing the difference data corresponding to the pixel as a binary number;
• wherein
• the data signal of the difference data in which the number of signal changes is reduced more than a case of outputting the pixel data to the data signal line is output.

An image receiving method for receiving image data by an image receiver by receiving a pixel value composing the image data as a data signal from a device connected by a data signal line, the data signal expressing a difference between mutually adjacent pixels;

• the method comprising:
• a step of causing the image receiver to receive the data signal transmitted via the data signal line;
• a step of causing the image receiver to carry out a process of adding the received data signal and the pixel value according to a data signal received immediately before the received data signal in an order of reception of the data signal so as to obtain the pixel value according to the received data signal;
• and
• a step of causing the image receiver to generate image data by the obtained pixel value and retain the generated image data in an image data retention unit.

A program for transmitting image data to a device connected by a data signal line;

• the program causing a computer to execute:
• a step of reading the image data from an image data retention unit storing the image data to be transmitted and obtaining data of a difference between mutually adjacent pixels of the image data;
• and
• a step of sequentially outputting a data signal to the data signal line in accordance with an arrangement of the pixels, the data signal expressing the difference data corresponding to the pixel as a binary number;
• wherein
• the data signal of the difference data in which the number of signal changes is reduced more than a case of outputting the pixel data to the data signal line is output.

A program for receiving image data by receiving a pixel value composing the image data as a data signal from a device connected by a data signal line, the data signal expressing a difference between mutually adjacent pixels;

• the program causing a computer to execute:
• a step of receiving the data signal transmitted via the data signal line;
• a step of carrying out a process of adding the received data signal and the pixel value according to a data signal received immediately before the received data signal in an order of reception of the data signal so as to obtain the pixel value according to the received data signal;
• and
• a step of generating image data by the obtained pixel value and retaining the generated image data in an image data retention unit by the image receiver.