Image processing device correcting image data, image sensor and image processing method

An image sensor comprising:

• a lens which focuses incident light;
• a sensor which photoelectrically converts the light obtained via the lens and observes a signal for a first color, a signal for a second color, and a signal for a third color;
• a demosaicing section which executes a demosaicing process based on the signal for the first color, the signal for the second color, and the signal for the third color to generate a color image signal;
• a gain value acquisition section which acquires a gain value obtained by an automatic white balance process executed on the color image signal;
• a color matrix coefficient generation section which, based on the gain value acquired by the gain value acquisition section, determines a 3×3 matrix including 9 correction color matrix coefficients and having a property of correcting a change in an appearance caused by a color temperature;
• and
• a color matrix section which, based on the 9 correction color matrix coefficient, performs a color adjustment on the color image signal obtained by the automatic white balance process,
• wherein the color matrix coefficient generation asection gradually changes 4 correction color matrix coefficients included in the 3×3 matrix,
• the image data to be processed is data relating to red, green, and blue,
• the 4 correction color matrix coefficients comprise a first correction color matrix coefficient and a second correction color matrix coefficient, and
• the color matrix generation section determines the first correction color matrix coefficient by determining a product of a first function having a ratio of a red gain value to a blue gain value as a parameter of the first function and a preset color coefficient for red, and determines the second correction color matrix coefficient by determining a product of a second function having the ratio as a parameter of the second function and a preset color coefficient for blue.

An image processing method comprising:

• acquiring a gain value obtained by an automatic white balance process executed on image data to be processed;
• determining a 3×3 matrix including 9 correction color matrix coefficients having a property of correcting a change in an appearance caused by a color temperature corresponding to the gain value based on the gain value;
• and
• performing a color adjustment on the image data subjected to the automatic white balance process based on the 9 correction color matrix coefficient,
• wherein the determining comprises gradually changing 4 correction color matrix coefficients included in the 3×3 matrix,
• the image data to be processed is data relating to red, green, and blue, the 4 correction color matrix coefficients comprises a first correction color matrix coefficient and the second correction color matrix coefficient, and
• the determining includes determining the first correction color matrix coefficient by determining a product of a first function having a ratio of a red gain value to a blue gain value as a parameter of the first function and a preset color coefficient for red, and determining a second correction color matrix coefficient by determining the product of a second function having the ratio as a parameter of the second function and a preset color coefficient for blue.