Reading images in spresense

[Bhalaji Kharthik]

I would like to know the ways in which images are read in spresense, the format in which they are read and also is there any function to load images in spresense using the in-built image processing library?

[KamilTomaszewski]

Hi @bhalaji-kharthik,

The best option to see how to read images from the Spresense camera is this example: https://github.com/sonydevworld/spresense-nuttx-apps/tree/1a501330f462e8d433c31fd6f6b7822a70ed0c26/examples/camera

You can also see the documentation here:
https://developer.sony.com/develop/spresense/docs/sdk_developer_guide_en.html#_camera

The image formats you can get with the Spresense camera are JPEG and YUV4:2:2.

You have an image processing library here: https://github.com/sonydevworld/spresense-nuttx/blob/b02a66b25bccdaeece1ba4aaf5ba53f427b3bdc2/boards/arm/cxd56xx/spresense/include/cxd56_imageproc.h. It can convert image to RGB or gray scale. It can also resize and clip the image.

Best Regards,
Kamil Tomaszewski

[Bhalaji Kharthik]

@KamilTomaszewski Can we adjust the resolution of spresense camera and capture images with different resolutions in spresense?

[KamilTomaszewski]

Hi @Bhalaji-Kharthik,

You can change the resolution. You just need to pass other values here: https://github.com/sonydevworld/spresense-nuttx-apps/blob/1a501330f462e8d433c31fd6f6b7822a70ed0c26/examples/camera/camera_main.c#L522

The possible values are defined here: https://github.com/sonydevworld/spresense-nuttx/blob/b02a66b25bccdaeece1ba4aaf5ba53f427b3bdc2/include/nuttx/video/video.h#L193

Here you can find information about the limitations:
https://developer.sony.com/develop/spresense/docs/sdk_developer_guide_en.html#_restrictions_of_image_size_and_frame_rate

Best Regards,
Kamil Tomaszewski

[Bhalaji Kharthik]

@KamilTomaszewski Thank you!