Transmission device, transmission method, and program

A transmission method comprising:

• a sequentially acquiring frame images drawn in a frame buffer;
• a determining whether or not the frame image is an image quality priority image;
• a basic parameter value decision step of deciding, for the frame image that is not the image quality priority image, values of parameters used for encoding an encoding unit that is a part or whole of the frame image, by applying a difference between a control amount and a target value to a predetermined control rule;
• an image quality priority parameter value decision step of deciding, for the frame image that is the image quality priority image, values of parameters used for the encoding unit of the frame image;
• an encoding processing step of generating image data by executing the encoding of the encoding unit on a basis of the values of the parameters decided in the basic parameter value decision step or the image quality priority parameter value decision step;
• and
• a transmitting the image data, wherein, in the image quality priority parameter value decision step, as the values of the parameters used for the encoding unit of the frame image, values by which a data size of the generated image data becomes larger than those decided by applying the difference between the control amount and the target value to the predetermined control rule are decided,
• wherein the determining includes determining that the frame image immediately after assets used for drawing the frame image are switched is the image quality priority image.

A non-transitory computer storage readable medium comprising computer executable program code configured to instruct a computer to perform the following steps:

• by an acquisition section, sequentially acquiring frame images drawn in a frame buffer;
• by a determination section, determining whether or not the frame image is an image quality priority image;
• a basic parameter value decision procedure of deciding, for the frame image that is not the image quality priority image, values of parameters used for encoding an encoding unit that is a part or whole of the frame image, by applying a difference between a control amount and a target value to a predetermined control rule;
• an image quality priority parameter value decision procedure of deciding, for the frame image that is the image quality priority image, values of parameters used for the encoding unit of the frame image;
• an encoding processing procedure of generating image data by executing the encoding of the encoding unit on a basis of the values of the parameters decided in the basic parameter value decision procedure or the image quality priority parameter value decision procedure;
• and
• by a transmission section, transmitting the image data,
• wherein, in the image quality priority parameter value decision procedure, as the values of the parameters used for the encoding unit of the frame image, values by which a data size of the generated image data becomes larger than those decided by applying the difference between the control amount and the target value to the predetermined control rule are decided, and
• wherein the determination section determines that the frame image immediately after assets used for drawing the frame image are switched is the image quality priority image.