Compared to the conventional Hi-Vision, 8K SHV video has 16 times higher pixel count (7,680 wide x 4,320 high = 33 megapixels), 4 times higher frame frequency (120 Hz, i.e. 120 frames per second) and captures a wider range of colors by using the wide color gamut.
 To capture 8K SHV video, a camera must have 33 megapixels for its image sensor, which transforms lights into electric signals. We previously used multiple 8-megapixel image sensors in combination, but today an image sensor that has more than 33 megapixels has emerged.
 With higher frame frequency, fast-moving scenes such as sport can be captured smoothly with high quality. We have developed an 8K SHV camera that supports the maximum 120-Hz frame frequency.
 A wide-color-gamut camera can capture red, blue and green colors more vividy. While conventional cameras covered only about 75% of the colors in the natural world, the wide-color-gamut camera can reproduce 99.9% of real object colors.
 The easiest way to increase the number of pixels is to enlarge an image sensor to increase the imaging pixel count. But a larger image sensor will inevitably make the camera size larger, which is not practical. It is therefore required to nanofabricate pixels, instead of increasing the size of image sensor.
 If an image sensor is nanofabricated, the amount of light injected into each pixel decreases. Likewise, if the frame frequency is increased, light acquisition time of each pixel shortens. As these cause a decline of camera's sensitivity, striking a balance between nanofabrication/speed-up and practical sensitivity/size of the image sensor is the important point in development of 8K SHV cameras.
 To deal with the insufficient pixel count and sensitivity, we initially employed a 4-sensor imaging device that breaks up incident light by a prism and uses four large image sensors (one each for red and blue and two for green). As the pixel count of image sensors increased, we then developed a 3-sensor imaging device that uses each image sensor for red, blue and green.
 To downsize cameras, we also developed a single-chip color imaging 8K SHV camera equipped with fine RGB color filters on a single image sensor. The color image sensor without the need of prism can realize a compact, lightweight 8K SHV camera.
 The first 8K SHV camera weighed as much as 80kg, with large image sensors and lenses (left figure). Today, a compact lightweight camera weighing only 2kg that uses a small single-chip color image sensor has been developed and used in shooting footages (right figure).
Original 8K SHV camera(four-sensor)
(In 2002 / 80kg)
 

Compact lightweight 8K SHV camera
(In 2013 / 2kg)

 As a single-chip color image sensor divides its pixels into RGB colors, even a sensor with 33 megapixels is not sufficient for 8K SHV. To realize a compact and practical camera of high image quality, we have succeeded in developing a full-specification single-chip color image sensor with 133 megapixels, 4 times as many pixels as a 33-megapixel sensor. With a wide selection of 8K SHV cameras, we are flexible to meet various shooting needs according to objects and environments.
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