Standard jpeg codec

The overlay generators can position up to characters of text anywhere in the video frame. A unique text string, consisting of mixed constant and variable text, may be defined for each overlay generator.

Text variables are automatically updated every video frame. Supported variables include time, date, and frame count. Overlay images and high quality, styled unicode text bold, italic, underline, outline and shadow can be displayed on top of the composite video output, compressed streams, or preview stream but not low latency preview stream.

Up to full-color overlay regions are supported on the composite output, and up to eight monochrome-only regions are supported on compressed and preview streams except low latency preview. BMP and PNG image formats are supported, with 24 or 32 bits per pixel and up to eight transparancy levels.

Example overlay captured from compressed stream up to eight transparency levels, monochrome only. Also, unlike composite output overlays, these overlays are limited in number, size and complexity; see the above right image for an example what is possible.

Note: Decoding is guaranteed only for streams captured with the The composite output video can be sourced from either the composite video input or a decoded compressed stream. Model supports a low latency preview mode for real-time applications. What is JPEG? JPEG Advantages vs. Higher compression without compromising quality. Progressive image reconstruction which allows to see full image even during the transmission process.

Define Region of interest that allows to define some important areas to be compressed at a higher quality than other one. The value 1 indicates lossless mode. Increasing values result in higher compression ratios and lower image quality.

Enables encoding in frequency order. Device implementations of JPEG XR encoders can organize a file in spatial order to reduce the memory required during encoding. Frequency order is recommended unless you have performance or application-specific reasons to use spatial order. The default operation for a region transcode is to expand the requested region to include the surrounding pixels that are required for overlap decoding of the region edges. If the source image is not tiled or if the requested region includes partial tiles, this parameter is ignored.

If the image contains an interleaved alpha channel, the value of ImageDataDiscard is applied to the alpha channel unless the AlphaDataDiscard property is set to 4, in which case the alpha channel is discarded. For planar alpha, the frequency data that is discarded is controlled by the AlphaDataDiscard property.

Interleaved alpha is supported only for certain RGB pixel formats. Planar alpha is supported for any image format that defines an alpha channel. Sets the level of overlap filtering. With overlap filtering, transform coefficients are applied across block and macroblock boundaries. This can reduce blocking artifacts. Specifies whether to use the Quality , Overlap , and Subsampling properties instead of the generic ImageQuality property.

For more information about these formats, see Native Pixel Formats. Skip to main content. This browser is no longer supported.

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