A benefit for photography enthusiasts: HDR rendering analysis of CMOS image sensors-EEWORLD

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High Dynamic Range (HDR)

A feature of High Dynamic Range (HDR) imaging is that it can be used to capture images with a wide contrast between the brightest and darkest areas. By extending the dynamic range, it helps make such images look more natural. Toshiba's image sensors have developed an HDR function that can correct high-contrast scenes to produce more natural images for both still and video capture. Toshiba's HDR function reduces the blur and false colors inherent in HDR synthesis, providing smoother and clearer video.

Toshiba HDR: Producing smooth, colorful images

Still image HDR effect example

Movie HDR effect example

Toshiba HDR: Using single frame method

There are single-frame and multi-frame HDR methods.

Toshiba's image sensors use a single-frame HDR approach.

Single Frame HDR… takes interlaced photos simultaneously with different exposure times and then combines them into a single HDR image.

Toshiba HDR: Single-talent HDR example

Multi-frame HDR...combines multiple frames captured with different exposure times into a single HDR image.

Multi-frame HDR Example Toshiba HDR: Features

Video with faster frame rates

To compose a single HDR image, multi-frame HDR must capture multiple frames of a scene with short exposure and long exposure, while single-frame HDR only needs to capture one frame.

Therefore, the frame rate of single-frame HDR video is faster than that of multi-frame HDR. The image sensor provided by Toshiba supports a fast frame rate of up to 60 frames at Full HD resolution.

Provide smooth video

Long exposures can cause moving objects to become blurry. To address this problem, Toshiba HDR combines short and long exposures into one image.

This method helps reduce motion blur that is typically caused by HDR compositing, providing smoother video.

Brighter colors, less false colors

Shooting moving objects with multi-frame HDR will cause motion blur between adjacent frames because their images are different in the target area in different frames. Combining these images into a single HDR image will cause false colors. Since single-frame HDR merges the captured short and long exposure lines into a single HDR image, it will reduce motion blur.

Therefore, single-frame HDR can provide images with brighter colors and less false colors.

Solution for low resolution

Since single-frame HDR uses different exposure times for different shapes (see the “Single-frame method” figure), it usually has lower resolution in the vertical direction. To improve vertical resolution, Toshiba Single-frame HDR integrates various innovations depending on the target application and resolution requirements.

Toshiba's image sensors designed for smartphone and tablet applications offer twice as many pixels vertically as is actually needed, while image sensors for surveillance and automotive camera applications use a unique shooting method.

HDR compression function

The pixel data of the synthesized HDR image exceeds 10 bits of data, and in order to perform other types of image processing, the HDR pixel data must be compressed to use fewer bits of data.

Generally speaking, there are two compression methods that do this: global tone mapping applies the same tone curve to the entire image, while local tone mapping applies the tone curve only to parts of the image.

Toshiba's HDR function implements a unique compression method originally developed by Toshiba based on local tone mapping technology. It helps reduce false colors and contrast loss, and maintains natural tones.

HDR image sensor lineup

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