Abstract: Each brightness value for an image data string for each of a plurality of fields successively stored in a RAM, is integrated by an integrator, and a result of the integration is stored in registers. Image data for a current field stored above is stored in a register, and further a one-field pixel average value for the image data is computed. The computed one-field pixel average value is stored in the register. Image data for each field stored in registers, is integrated by an integrator, and further a three-field pixel average value is computed from the result with the computed average value stored in a register. Computing is executed in a computing section by using the one-field pixel average value, three-field pixel average value, and an Image data string stored in the RAM to generate corrected image data.

Abstract: The present invention introduces an image conversion apparatus capable of coinciding the luminance variation ratio in the display unit of the television receiver with a variation ratio according to the linear operation though the linear operation is applied to the video signal outputted from the computer. The first &ggr; correction circuit receives the video signal outputted from the computer. This video signal intends to be inputted to a CRT display unit, therefore, the video signal is provided with an inverse &ggr; property corresponding to the luminance property of the CRT display unit. The first &ggr; correction circuit 100 applies the &ggr; correction operation to the video signal so as to remove the inverse &ggr; property in the video signal. The linear arithmetic circuit applies the linear operation to the output from the first &ggr; correction circuit.